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Sample records for humboldt county california

  1. 11. ROAD VIEW. SOUTH OF PIERCY, HUMBOLDT COUNTY, CALIFORNIA. OLD ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    11. ROAD VIEW. SOUTH OF PIERCY, HUMBOLDT COUNTY, CALIFORNIA. OLD HIGHWAY ON LEFT. NEW HIGHWAY ON RIGHT. LOOKING SW. - Redwood National & State Parks Roads, California coast from Crescent City to Trinidad, Crescent City, Del Norte County, CA

  2. 10. ROAD VIEW. SOUTH OF PIERCY, HUMBOLDT COUNTY, CALIFORNIA. OLD ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    10. ROAD VIEW. SOUTH OF PIERCY, HUMBOLDT COUNTY, CALIFORNIA. OLD HIGHWAY ON LEFT. NEW HIGHWAY ON RIGHT. LOOKING W. - Redwood National & State Parks Roads, California coast from Crescent City to Trinidad, Crescent City, Del Norte County, CA

  3. 5. TUNNEL TREE AT DRIVETHROUGHTREE PARK. LEGGETT, HUMBOLDT COUNTY, CALIFORNIA. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. TUNNEL TREE AT DRIVE-THROUGH-TREE PARK. LEGGETT, HUMBOLDT COUNTY, CALIFORNIA. LOOKING NE. - Redwood National & State Parks Roads, California coast from Crescent City to Trinidad, Crescent City, Del Norte County, CA

  4. Relative Tsunami Hazard Maps, Humboldt County, California

    NASA Astrophysics Data System (ADS)

    Dengler, L. A.; Ludy, B. R.; Patton, J. R.

    2003-12-01

    We present a series of maps depicting the relative tsunami hazard of coastal Humboldt County in Northern California. Unlike inundation maps that show a single line to show the inland extent of flooding, these maps use a four-color zonation to represent relative risk. The highest hazard area has experienced tsunami or storm wave inundation in historic times. These areas include beaches and low coastal bluffs on the open coast and low areas adjacent to Humboldt Bay and major river deltas. The high hazard zones are also mapped as zone A (100 year flooding) or zone V (100 year flood with wave action) on FEMA Flood Insurance Rate Maps. Moderate hazard zones are areas likely to be flooded by a major tsunami generated by the Cascadia subduction zone based on published paleotsunami studies, numerical modeling (Bernard and others, 1994) and observations of recent tsunamis elsewhere. Current estimates of major Cascadia earthquake recurrence averages about 500 years. Low hazard zones show no evidence of flooding in the paleotsunami record and are likely to provide refuge in all but the most extreme event. No hazard areas are too high in elevation and/or too far inland to be at risk. A continuous gradational color scale ranging from red (high hazard) through orange (medium), yellow (low) to gray (no hazard) depicts the zones. The blurred boundaries help convey the continuum of possible events and the uncertainty in delineating distinct inundation lines. The maps are GIS based to facilitate ready adaptation by planners and emergency managers. The maps are intended for educational purposes, to improve awareness of tsunami hazards and to encourage emergency planning efforts of local and regional organizations by illustrating the range of possible tsunami events.

  5. Geology of Tompkins Hill gas field, Humboldt County, California

    SciTech Connect

    Parker, J.

    1988-03-01

    The Tompkins Hill gas field, located in Humboldt County, California, is the only producing field in the Eel River basin. The field is an anticlinal flexure on the north limb of the Eel River syncline in the central onshore portion of the basin. The Tompkins Hill anticline is doubly plunging and trends east-west. Stratigraphic units present in the field include the Yager, Eel River, and Rio Dell Formations and Scotia Bluffs Sandstone. The Yager occurs below a major unconformity, and forms economic basement. Strata overlying the Eel River, Rio Dell, and Scotia Bluffs represent a progradational basin-fill sequence, including submarine fan, slope, shelf, and littoral deposits. The primary productive interval in the field is within the middle of the Rio Dell and consists of interbedded fine sandstone and mudrock. Portions of the Eel River and upper Rio Dell Formations are also productive. The Tompkins Hill gas field was discovered by the Texas Company in 1937 with the drilling of Eureka 2 in Sec. 22, T3N, R1W. The play was probably based on outcrop mapping and the presence of gas seeps in the area. The primary trapping mechanism in the field is structural, although stratigraphy may have been a factor in constraining gas. To date, 39 producing wells have been drilled and 87.4 bcf of gas, consisting of 98% methane, has been produced. Very minor amounts of condensate are also produced. The source rocks for the gas are uncertain, but both the Yager Formation and strata of the lower Wildcat Group may have contributed.

  6. Earthquake and Tsunami planning, outreach and awareness in Humboldt County, California

    NASA Astrophysics Data System (ADS)

    Ozaki, V.; Nicolini, T.; Larkin, D.; Dengler, L.

    2008-12-01

    Humboldt County has the longest coastline in California and is one of the most seismically active areas of the state. It is at risk from earthquakes located on and offshore and from tsunamis generated locally from faults associated with the Cascadia subduction zone (CSZ), other regional fault systems, and from distant sources elsewhere in the Pacific. In 1995 the California Division of Mines and Geology published the first earthquake scenario to include both strong ground shaking effects and a tsunami. As a result of the scenario, the Redwood Coast Tsunami Work Group (RCTWG), an organization of representatives from government agencies, tribes, service groups, academia and the private sector from the three northern coastal California counties, was formed in 1996 to coordinate and promote earthquake and tsunami hazard awareness and mitigation. The RCTWG and its member agencies have sponsored a variety of projects including education/outreach products and programs, tsunami hazard mapping, signage and siren planning, and has sponsored an Earthquake - Tsunami Education Room at the Humboldt County fair for the past eleven years. Three editions of Living on Shaky Ground an earthquake-tsunami preparedness magazine for California's North Coast, have been published since 1993 and a fourth is due to be published in fall 2008. In 2007, Humboldt County was the first region in the country to participate in a tsunami training exercise at FEMA's Emergency Management Institute in Emmitsburg, MD and the first area in California to conduct a full-scale tsunami evacuation drill. The County has conducted numerous multi-agency, multi-discipline coordinated exercises using county-wide tsunami response plan. Two Humboldt County communities were recognized as TsunamiReady by the National Weather Service in 2007. Over 300 tsunami hazard zone signs have been posted in Humboldt County since March 2008. Six assessment surveys from 1993 to 2006 have tracked preparedness actions and personal

  7. GIS based Relative Tsunami Hazard Maps for Northern California, Humboldt and Del Norte Counties

    NASA Astrophysics Data System (ADS)

    Patton, J. R.; Dengler, L. A.

    2004-12-01

    Tsunami hazard maps are generated using a geographical information systems (GIS) approach to depict the relative tsunami hazard of coastal Humboldt and Del Norte Counties in northern California. Maps are composed for the Humboldt Bay, Eel River, and Crescent City regions and available online at http://www.humboldt.edu/~geodept/earthquakes/rctwg/toc.html . In contrast to previous mapping efforts that utilize a single line to represent inundation, hazard is displayed gradationally. A 2.5D surface is constructed to represent this hazard. Elevation, normally used for 2.5D surfaces, is substituted with hazard units. Criteria boundaries are used to separate regions of increasing hazard. Criteria boundaries are defined based on numerical modeling, paleoseismic studies, historical flooding, FEMA Q3 flood maps, and impacts of recent tsunamis elsewhere. Zones are constructed to further adjust the criteria with respect to a physically determined variable hazard (e.g. proximity to open ocean). A triangular irregular network (TIN) is constructed using hazard criteria boundaries as breaklines. Fabricated points are necessary to construct a hazard surface and are placed where criteria boundaries diverge or where hazard is nonlinear between criteria boundaries. Hazard is displayed as a continuous gradational color scale ranging from red (high hazard) through orange (medium), yellow (low) to gray (no hazard). The maps are GIS based to facilitate ready adaptation by planners and emergency managers. The maps are intended for educational purposes, to improve awareness of tsunami hazards and to encourage emergency planning efforts of local and regional organizations by illustrating the range of possible tsunami events.

  8. Humboldt County Employer Survey.

    ERIC Educational Resources Information Center

    Lyons, Dave

    A project was undertaken in Humboldt County to collect information from large and small businesses in the areas of agriculture, mining, manufacturing, transportation, wholesale and retail, finance, services, and public information with respect to their employee requirements and needs. In all, 451 firms were surveyed to determine the size of the…

  9. 15. 'Concrete Bridge Over Salt River, Port Kenyon, Humboldt County, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    15. 'Concrete Bridge Over Salt River, Port Kenyon, Humboldt County, California, A.J. Logan, County Surveyor, H.J. Brunnier, Consulting Engineer, March 7, 1919,' showing general plan, plan of top chord, elevation of main girder, transverse section, plan section at deck level. - Salt River Bridge, Spanning Salt River at Dillon Road, Ferndale, Humboldt County, CA

  10. 17. "Concrete Bridge Over Salt River, Port Kenyon, Humboldt County, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    17. "Concrete Bridge Over Salt River, Port Kenyon, Humboldt County, California, A.J. Logan, County Surveyor, H.J. Brunnier, Consulting Engineer, March 7, 1919," showing plan of bars in top flange, elevation of girder reinforcement, plan of bars in bottom flange - Salt River Bridge, Spanning Salt River at Dillon Road, Ferndale, Humboldt County, CA

  11. 18. "Concrete Bridge Over Salt River, Port Kenyon, Humboldt County, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    18. "Concrete Bridge Over Salt River, Port Kenyon, Humboldt County, California, A.J. Logan, County Surveyor, H.J. Brunnier, Consulting Engineer, March 7, 1919," showing elevation of center pier, elevation and plan of north and south abutments, sections of abutments, pier, and pier footings - Salt River Bridge, Spanning Salt River at Dillon Road, Ferndale, Humboldt County, CA

  12. 51. Photographer unknown 1930 HUMBOLDT COUNTY, SECTION A, HIGHWAY 1. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    51. Photographer unknown 1930 HUMBOLDT COUNTY, SECTION A, HIGHWAY 1. 1-HUM-1-A #101, MEASURING BETWEEN TREES, 1930. Stamped office copy. - Redwood National & State Parks Roads, California coast from Crescent City to Trinidad, Crescent City, Del Norte County, CA

  13. 16. 'Concrete Bridge Over Salt River, Port Kenyon, Humboldt County, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    16. 'Concrete Bridge Over Salt River, Port Kenyon, Humboldt County, California, A.J. Logan, County Surveyor, H.J. Brunnier, Consulting Engineer, March 7, 1919,' showing detail of floor beam at central pier, half section of cantilever slab at end of bridge, floor beam end panels, slab reinforcing, plan of slab reinforcing, diagram of slab bars, typical floor girder. - Salt River Bridge, Spanning Salt River at Dillon Road, Ferndale, Humboldt County, CA

  14. 7. ABANDONED OLD HIGHWAY 101. NORTH OF LEGGETT. HUMBOLDT COUNTY, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. ABANDONED OLD HIGHWAY 101. NORTH OF LEGGETT. HUMBOLDT COUNTY, CALIFORNIA. NOTE CANTILEVERED DECKING. SOUTH FORK OF EEL RIVER AT LEFT. LOOKING SW. - Redwood National & State Parks Roads, California coast from Crescent City to Trinidad, Crescent City, Del Norte County, CA

  15. Orickite and coyoteite, two new sulfide minerals from Coyote Peak, Humboldt County, California.

    USGS Publications Warehouse

    Erd, Richard C.; Czamanske, G.K.

    1983-01-01

    Minute quantities of orickite and coyoteite occur with rare alkali iron sulphides in a mafic alkalic diatreme near Orick, Humboldt County. Orickite, NaxKyCu0.95Fe1.06zH2O (x,y < 0.03, z < 0.5), is hexagonal, a 3.695, c 6.16 A, D 4.212 g/cm3, Z = 4. The strongest XRD reflections are 3.08(100), 3.20(90), 2.84(60), 1.73(55), 1.583(30) A. The mineral is brass yellow, opaque, weakly pleochroic, but strongly anisotropic (greyish brown to greyish blue) in reflected light. Orickite is compositionally near to Fe-rich chalcopyrite, but it may be related to synthetic chalcogenides with a distorted wurtzite-(2H) structure. Coyoteite, NaFe3S5.2H2O, is triclinic, P1 or P1, a 7.409(8), b 9.881(6), c 6.441(3) A, alpha 100o25(3)', beta 104o37(5)', gamma 81o29(5)', D 2.879 g/cm3, Z = 2; strongest XRD reflections are 5.12(100), 7.13(90), 3.028(80), 3.080(70), 9.6(60), 5.60(60) A. Coyoteite is black, opaque, weakly pleochroic (pale brownish grey) and strongly anisotropic (grey to dull golden orange) in reflected light. It is unstable under normal atmospheric conditions. -J.A.Z.

  16. 56. Photographer unknown February 1925 HUMBOLDT COUNTY, SECTION J, HIGHWAY ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    56. Photographer unknown February 1925 HUMBOLDT COUNTY, SECTION J, HIGHWAY 1. HUM-1-J #36, SINKS ALONG OCEAN SHORE, 2-25. Stamped office copy. - Redwood National & State Parks Roads, California coast from Crescent City to Trinidad, Crescent City, Del Norte County, CA

  17. 54. Photographer unknown February 1925 HUMBOLDT COUNTY, SECTION J, HIGHWAY ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    54. Photographer unknown February 1925 HUMBOLDT COUNTY, SECTION J, HIGHWAY 1. HUM-1-J #34, SINKS ALONG HIGH. NEAR OCEAN, 2-25. - Redwood National & State Parks Roads, California coast from Crescent City to Trinidad, Crescent City, Del Norte County, CA

  18. 50. Photographer unknown Date unknown HUMBOLDT COUNTY, SECTION A, HIGHWAY ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    50. Photographer unknown Date unknown HUMBOLDT COUNTY, SECTION A, HIGHWAY 1. ABANDONED PORTION OF HIGHWAY RECONSTRUCTED 1935 ACROSS RIVER CONNECTING WITH NEW SMITH PT. BR., 1-HUM-1A #203. Stamped office copy. - Redwood National & State Parks Roads, California coast from Crescent City to Trinidad, Crescent City, Del Norte County, CA

  19. 53. Photographer unknown Date unknown VAN DUZEN BRIDGE, HUMBOLDT COUNTY, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    53. Photographer unknown Date unknown VAN DUZEN BRIDGE, HUMBOLDT COUNTY, SECTION F, HIGHWAY 1. 1. 1-HUM-1-F #24, VAN DUZEN BR. APPRAOCH/ST. 167+50. - Redwood National & State Parks Roads, California coast from Crescent City to Trinidad, Crescent City, Del Norte County, CA

  20. 78 FR 50025 - Humboldt County (CA) Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-08-16

    ... Forest Service Humboldt County (CA) Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of meetings. SUMMARY: The Humboldt Resource Advisory Committee (RAC) will meet in Eureka... recommend project proposals. Additonal information on the Humboldt Resource Advisory Committee and...

  1. Distributed Hydrology Soil Vegetation Model (DHSVM) and Sediment Discharge in a Small, Timber Production Watershed, Humboldt County, California

    NASA Astrophysics Data System (ADS)

    Stubblefield, A.; Huggett, B.; Sullivan, K.; Dhakal, A.

    2008-12-01

    County, California, utilizing site specific precipitation, hydrographic, and sediment data. Hydrographic and sediment discharge data from 2002 to present are used to train and validate the model. A detailed sediment source inventory from both the road and stream courses further informs the model process and parameterization of sediment production and mobilization within the watershed. The availability of continuous discharge and sediment loading via turbidity threshold stations (TTS) allows validation of the model's performance on multiple levels: average annual, monthly, or weekly sediment loading, and on an event by event basis. Effective validation permits the use of the model to understand the effects of future management strategies, i.e. timber harvest, road construction or decommissioning on a site-specific basis, and to model landscape effects of wildfire and climate change scenarios on watershed functions.

  2. Cumulative impact assessment in coastal wetland watersheds: Jacoby Creek, Humboldt County, California

    SciTech Connect

    Tuttle, A.E.

    1985-01-01

    This work tests the transferability of a model cumulative impact assessment method - developed for an agricultural/residential watershed in central California - to a forested/residential watershed in northern California. The method focuses on coastal wetland sedimentation caused by development in the surrounding watershed. The premise of the method is that future wetland impacts will resemble those of the past if future anthropogenic disturbances and natural processes occur at the same intensity as those experienced over the historical record. The method quantifies historic land-use disturbance and wetland change, and establishes a recommended upper limit for future land-use intensity based on historic site disturbance. Indices of site disturbance are keyed to local erosional processes. Measures include impervious surface coverage, bare ground disturbance, location of mass-movement features, and intersections of roads with streams. For Jacoby Creek it was found that the creek-mouth delta grew nearly 18 acres between 1931 and 1978 due to deposition of sediment from the 17 sq. mi. watershed. Approximately 8 acres of the delta have become vegetated; established salt marsh remains unchanged. The method is potentially transferable to other cumulative impact problems where land-use intensity is an important variable.

  3. Geologic map of the Redwood Creek drainage basin, Humboldt County, California

    USGS Publications Warehouse

    Harden, Deborah Reid; Kelsey, H.M.; Morrison, S.D.; Stephens, T.A.

    1982-01-01

    A 1:62,500-scale geologic map with 14 rock stratigraphic units and an accompanying explanatory text are used to describe the geology of the Redwood Creek drainage basin of northwestern California. A large part of Redwood National Park is located in the downstream part of this actively eroding drainage basin. The bedrock consists primarily of Mesozoic sedimentary and metamorphic rocks. The structurally complex Franciscan assemblage of rocks underlies most of the basin, but rocks of the Klammath Mountain tectonic province occurs in a small eastern part of the basin. Most major boundaries between Mesozoic rock units are north-northwest trending faults parallel to the regional structural trend. Extensive areas of surficial coastal plain sediments, landslide deposits, stream terrace deposits and modern alluvium are also present; these areas help identify loci of vigorous recent erosion. (USGS)

  4. Erosional landform map of the Redwood Creek drainage basin, Humboldt County, California, 1947-74

    USGS Publications Warehouse

    Nolan, K.M.; Harden, D.M.; Colman, Steven M.

    1976-01-01

    Landslides and actively eroding stream channels disrupt roads, damage valuable timberland, and increase stream sediment loads in northwestern California. This 1:62,500 photointerpretative map shows the distribution of ten common types of fluvial and mass-movement erosional landforms in the drainage basin of Redwood Creek in 1947 and 1974. The mapped landforms include slides, slumps, large compound earthflows, debris avalanches, unstable streambanks and adjacent hillslopes, small mass-movement features, questionable or inactive landslides, deeply incised amphitheater shaped drainage basins, small actively eroding water courses, and actively eroding main channel stream banks. The map legend describes these landforms and the techniques used in preparing the map. The amount and diversity of erosional activity increased greatly between 1947 and 1974. This increased activity apparently reflects major floods in 1953, 1955, 1964, and 1972, as well as the start of large scale, tractor-yarded clearcut timber harvest in the basin. (Woodard-USGS)

  5. Demographic characteristics and infectious diseases of a population of American black bears in Humboldt County, California.

    PubMed

    Stephenson, Nicole; Higley, J Mark; Sajecki, Jaime L; Chomel, Bruno B; Brown, Richard N; Foley, Janet E

    2015-02-01

    American black bears (Ursus americanus) are common, widely distributed, and broad-ranging omnivorous mammals in northern California forests. Bears may be susceptible to pathogens infecting both domestic animals and humans. Monitoring bear populations, particularly in changing ecosystems, is important to understanding ecological features that could affect bear population health and influence the likelihood that bears may cause adverse impacts on humans. In all, 321 bears were captured between May, 2001, and October, 2003, and blood samples were collected and tested for multiple zoonotic and vector-borne diseases. We found a PCR prevalence of 10% for Anaplasma phagocytophilum, and a seroprevalence of 28% for Toxoplasma gondii, 26% for Borrelia burgdorferi, 26% for A. phagocytophilum, 8% for Trichinella spiralis, 8% for Francisella tularensis and 1% for Yersinia pestis. In addition, we tested bears for pathogens of domestic dogs and found a seroprevalence of 15% for canine distemper virus and 0.6% for canine parvovirus. Our findings show that black bears can become infected with pathogens that are an important public health concern, as well as pathogens that can affect both domestic animals and other wildlife species. PMID:25700042

  6. Origin and evolution of the alkalic ultramafic rocks in the Coyote Peak diatreme, Humboldt County, California

    USGS Publications Warehouse

    Morgan, J.W.; Czamanske, G.K.; Gregory, Wandless A.

    1985-01-01

    Instrumental-neutron-activation analyses are reported for two uncontaminated rocks, a phlogopite-rich clot, and two contaminated rocks from the Coyote Peak diatreme, northwestern California. These data, combined with Nd, Sr, and Pb isotopic evidence, have been modeled to a multi-stage evolution for the uncontaminated rocks. Fertile mantle material (refractory elements 2.5?? chondritic abundances; Rb/Sr = 0.029 by weight) was depleted about 900 m.y. ago by congruent melting and removal of ~4% basaltic liquid; this depleted residue provided the source rock from which the Coyote Peak magma was ultimately derived. About 66 m.y. ago, the depleted mantle residue was incongruently melted in the presence of H2O and CO2 at a total pressure > 26 kb to yield ~0.5% of a Si-poor, Ca-rich melt. This melt then metasomatized depleted garnet-free harzburgite in the upper mantle at about 26 kb to produce a rock similar to phlogopite-bearing wehrlite. About 29 m.y. ago, this rock was subjected to an increase in pressure to >26 kb and incongruently melted to give ~0.5% of a second-stage melt resembling olivine melilitite in composition. Enroute to the surface, about 28% olivine and 2% titanomagnetite were lost from the highly fluid melt. Coarse-grained phlogopite-rich clots in the uncontaminated rocks apparently crystallized from a latestage liquid derived from the uncontaminated melt. Contaminated rocks appear to be the result of partial assimilation of, and dilution by, ~14% Franciscan graywacke country rock. The diatreme was emplaced near a converging plate margin where young hot oceanic mantle and crust of the Juan de Fuca plate was probably subducting obliquely beneath a thin lip of the North American plate. The unusual chemistry of the rocks may be the result of this complex tectonic setting which could also have included local strike-slip and extensional environments within the two plates pierced by the diatreme. ?? 1985.

  7. Origin and evolution of the alkalic ultramafic rocks in the Coyote Peak diatreme, Humboldt County, California

    NASA Astrophysics Data System (ADS)

    Morgan, John W.; Czamanske, Gerald K.; Gregory Wandless, A.

    1985-03-01

    Instrumental-neutron-activation analyses are reported for two uncontaminated rocks, a phlogopite-rich clot, and two contaminated rocks from the Coyote Peak diatreme, northwestern California. These data, combined with Nd, Sr, and Pb isotopic evidence, have been modeled to a multi-stage evolution for the uncontaminated rocks. Fertile mantle material (refractory elements 2.5× chondritic abundances; Rb/ Sr = 0.029 by weight) was depleted about 900 m.y. ago by congruent melting and removal of ~4% basaltic liquid; this depleted residue provided the source rock from which the Coyote Peak magma was ultimately derived. About 66 m.y. ago, the depleted mantle residue was incongruently melted in the presence of H 2O and CO 2 at a total pressure > 26 kb to yield ~0.5% of a Si-poor, Ca-rich melt. This melt then metasomatized depleted garnet-free harzburgite in the upper mantle at about 26 kb to produce a rock similar to phlogopite-bearing wehrlite. About 29 m.y. ago, this rock was subjected to an increase in pressure to >26 kb and incongruently melted to give ~0.5% of a second-stage melt resembling olivine melilitite in composition. Enroute to the surface, about 28% olivine and 2% titanomagnetite were lost from the highly fluid melt. Coarse-grained phlogopite-rich clots in the uncontaminated rocks apparently crystallized from a latestage liquid derived from the uncontaminated melt. Contaminated rocks appear to be the result of partial assimilation of, and dilution by, ~14% Franciscan graywacke country rock. The diatreme was emplaced near a converging plate margin where young hot oceanic mantle and crust of the Juan de Fuca plate was probably subducting obliquely beneath a thin lip of the North American plate. The unusual chemistry of the rocks may be the result of this complex tectonic setting which could also have included local strike-slip and extensional environments within the two plates pierced by the diatreme.

  8. Deformation of marine terraces in coastal Humboldt County, California: an evaluation using GIS-based analysis of LiDAR imagery

    NASA Astrophysics Data System (ADS)

    Padgett, J. S.; Kelsey, H. M.; Lamphear, D.

    2012-12-01

    Forming at sea level, uplifted wave-cut platforms serve as long-term geodetic markers. The spatial distribution and elevation of marine terrace sequences offer insight to regional active tectonics. Using LiDAR imagery embedded within a geospatial information system (GIS), we employ a surface classification model (SCM) developed by Bowels and Cowgill (2012) that identifies uplifted marine terraces on the basis of their micro topographical characteristics, low slope and low roughness. The LiDAR data sets were compiled utilizing several public and private sources to cover a large portion of the Humboldt County (northern California) coastline extending from Big Lagoon south to Table Bluff. We supplement LiDAR-derived elevations with elevations derived from kinematic GPS. We test the applicability of the SCM approach to identifying deformed marine terraces, and we also use other geomorphic analyses, including longitudinal profiles and distribution of knickpoints, to assess tectonic evolution and rates of landscape change along the central Humboldt County coastal region. Uplifted marine terraces record the regional patterns of uplift; these patterns both record the development of several north-northwest trending thrust faults, anticlines and synclines and chronicle Quaternary tectonic deformation and erosional histories.

  9. 76 FR 14897 - Humboldt County Resource Advisory Committee (RAC)

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-03-18

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF AGRICULTURE Forest Service Humboldt County Resource Advisory Committee (RAC) AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The Humboldt County Resource Advisory Committee (RAC) will meet in...

  10. 76 FR 9540 - Humboldt County Resource Advisory Committee (RAC)

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-02-18

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF AGRICULTURE Forest Service Humboldt County Resource Advisory Committee (RAC) AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The Humboldt County Resource Advisory Committee (RAC) will meet in...

  11. Educational and Demographic Profile: Humboldt County.

    ERIC Educational Resources Information Center

    California Postsecondary Education Commission, 2004

    2004-01-01

    This profile uniquely presents a variety of educational and socioeconomic information for Humboldt County, nearby counties, and the state. The profile highlights the relationship between various factors that affect the economic well-being of individuals and communities. This presentation of information provides a framework for enhanced…

  12. 78 FR 30267 - Humboldt County (CA) Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-22

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF AGRICULTURE Forest Service Humboldt County (CA) Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of meetings. SUMMARY: The Humboldt Resource Advisory Committee (RAC) will meet in...

  13. 77 FR 50082 - Humboldt County, CA Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-08-20

    ... From the Federal Register Online via the Government Publishing Office ] DEPARTMENT OF AGRICULTURE Forest Service Humboldt County, CA Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of meetings. SUMMARY: The Humboldt Resource Advisory Committee (RAC) will meet in...

  14. 57. G.M.W., photographer March 26, 1940 HUMBOLDT COUNTY, SECTION K, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    57. G.M.W., photographer March 26, 1940 HUMBOLDT COUNTY, SECTION K, HIGHWAY 1. HUM-1-K #93, STA. 255, 3-26-40, G.M.W. Stamped office copy. - Redwood National & State Parks Roads, California coast from Crescent City to Trinidad, Crescent City, Del Norte County, CA

  15. 59. V.H.G., photographer October 27, 1948 EUREKA, HUMBOLDT COUNTY, HIGHWAY ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    59. V.H.G., photographer October 27, 1948 EUREKA, HUMBOLDT COUNTY, HIGHWAY 1. HUM-1-EUR #59, LOOKING NORTH BROADWAY & CEDAR, 10-27-48, V.H.G. Stamped office copy. - Redwood National & State Parks Roads, California coast from Crescent City to Trinidad, Crescent City, Del Norte County, CA

  16. 58. V.H.G., photographer October 27, 1948 EUREKA, HUMBOLDT COUNTY, HIGHWAY ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    58. V.H.G., photographer October 27, 1948 EUREKA, HUMBOLDT COUNTY, HIGHWAY 1. HUM-1-EUR #60, LOOKING SOUTH, BROADWAY & CLARK, 10-27-48, V.H.G. Stamped office copy. - Redwood National & State Parks Roads, California coast from Crescent City to Trinidad, Crescent City, Del Norte County, CA

  17. Aquatic biology of the Redwood Creek and Mill Creek drainage basins, Redwood National Park, Humboldt and Del Norte counties, California

    USGS Publications Warehouse

    Iwatsubo, Rick T.; Averett, R.C.

    1981-01-01

    A 2-year study of the aquatic biota in the Redwood Creek and Mill Creek drainage basins of Redwood National Park indicated that the aquatic productivity is low. Densities of coliform bacteria were low except in Prairie Creek, a tributary to Redwood Creek, where a State park, county fish hatchery, grazing land, lumber mill, and scattered residential areas are potential sources of fecal coliform bacteria. Benthic invertebrate data indicated a diverse fauna which varied considerably between streams and among stream sections. Noteworthy findings include: (1) benthic invertebrates rapidly recolonized the streambed following a major storm, and (2) man-caused disruption or sedimentation of the streambed during low flow can result in drastic reductions of the benthic invertebrate community. Seven species of fish representing species typically found in northern California coastal streams were captured during the study. Nonparametric statistical tests indicate that condition factors of steelhead trout were significantly larger at sampling stations with more insolation, regardless of drainage basin land-use history. Periphyton and phytoplankton communities were diverse, variable in numbers, and dominated by diatoms. Seston concentrations were extremely variable between stations and at each station sampled. The seston is influenced seasonally by aquatic productivity at each station and amount of allochthonous material from the terrestrial ecosystem. Time-series analysis of some seston data indicated larger and sharper peak concentrations being flushed from the logged drainage basin than from the control drainage basin. (USGS)

  18. Digital Geologic Map of the Redding 1° x 2° Quadrangle, Shasta, Tehama, Humboldt, and Trinity Counties, California

    USGS Publications Warehouse

    Fraticelli, Luis A.; Albers, John P.; Irwin, William P.; Blake, Milton C., Jr.; Wentworth, Carl M.

    2012-01-01

    The Redding 1° x 2 quadrangle in northwestern California transects the Franciscan Complex and southern Klamath Mountains province as well as parts of the Great Valley Complex, northern Great Valley, and southernmost Cascades volcanic province. The tectonostratigraphic terranes of the Klamath province represent slices of oceanic crust, island arcs, and overlying sediment that range largely from Paleozoic to Jurassic in age. The Eastern Klamath terrane forms the nucleus to which the other terranes were added westward, primarily during Jurassic time, and that package was probably accreted to North America during earliest Cretaceous time. The younger Franciscan Complex consists of a sequence of westward younging tectonostratigraphic terranes of late Jurassic to Miocene age that were accreted to North America from mid-Cretaceous through Miocene time, with the easternmost being the most strongly metamorphosed. The marine Great Valley sequence, of late Jurassic and Cretaceous age, was deposited unconformably across the southernmost Klamath rocks, but in turn was underthrust at its western margin by Eastern belt Franciscan rocks. Pliocene and Quaternary volcanic rocks and sediment of the Cascades province extend into the southeastern part of the quadrangle, abutting the northernmost part of the great central valley of California. This map and database represent a digital rendition of Open-File Report 87-257, 1987, by L.A. Fraticelli, J.P. Albers, W.P. Irwin, and M.C. Blake, Jr., with various improvements and additions.

  19. Mass movement and storms in the drainage basin of Redwood Creek, Humboldt County, California: a progress report

    USGS Publications Warehouse

    Harden, Deborah Reid; Janda, Richard J.; Nolan, K. Michael

    1978-01-01

    Numerous active landslides are clearly significant contributors to high sediment loads in the Redwood Creek basin. Field and aerial-photograph inspections indicate that large mass-movement features, such as earthflows and massive streamside debris slides, occur primarily in terrain underlain by unmetamorphosed or slightly metamorphosed sedimentary rocks. These features cannot account for stream sediment derived from schist. Observed lithologic heterogeneity of stream sediment therefore suggests that large-scale mass movement is only one part of a complex suite of processes supplying sediment to streams in this basin. Other significant sediment contributors include various forms of fluvial erosion and small-scale discrete mass failures, particularly on oversteepened hillslopes adjacent to perennial streams. Photo-interpretive studies of landslide and timber-harvest history adjacent to Redwood Creek, together with analysis of regional precipitation and runoff records for six flood-producing storms between 1953 and 1975, indicate that loci and times of significant streamside landsliding are influenced by both local storm intensity and streamside logging. Analysis of rainfall records and historic accounts indicates that the individual storms comprising a late-19th-century series of storms in northwestern California were similar in magnitude and spacing to those of the past 25 years. The recent storms apparently initiated more streamside landslides than comparable earlier storms, which occurred prior to extensive road construction and timber harvest. Field observations and repeated surveys of stake arrays at 10 sites in the basin indicate that earthflows are especially active during prolonged periods of moderate rainfall; but that during brief intense storms, fluvial processes are the dominant erosion mechanism. Stake movement occurs mostly during wet winter months. Spring and summer movement was detected at some moist streamside sites. Surveys of stake arrays in two

  20. 55. E.M.C., photographer July 3, 1936 HUMBOLDT COUNTY, SECTION J, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    55. E.M.C., photographer July 3, 1936 HUMBOLDT COUNTY, SECTION J, HIGHWAY 1. 1-HUM-I-J #80, BITUMULS PORTION OF EXPERIMENTAL SECTION, E.M.C, 7-3-36. BACK READS: C/PROCESSING STABILIZING BITUMULS WITH BLADE AFTER BEING PROCESSED WITH SPRING TOOTH HARROW. Stamped office copy. - Redwood National & State Parks Roads, California coast from Crescent City to Trinidad, Crescent City, Del Norte County, CA

  1. Virgin Valley opal district, Humboldt County, Nevada

    USGS Publications Warehouse

    Staatz, Mortimer Hay; Bauer, Herman L., Jr.

    1951-01-01

    The Virgin Valley opal district, Humboldt County, Nevada, is near the Oregon-Nevada border in the Sheldon Game Refuge. Nineteen claims owned by Jack and Toni Crane were examined, sampled, and tested radiometrically for uranium. Numerous discontinuous layers of opal are interbedded with a gently-dipping series of vitric tuff and ash which is at least 300 ft thick. The tuff and ash are capped by a dark, vesicular basalt in the eastern part of the area and by a thin layer of terrace qravels in the area along the west side of Virgin Valley. Silicification of the ash and tuff has produced a rock that ranges from partly opalized rock that resembles silicified shale to completely altered rock that is entirely translucent, and consists of massive, brown and pale-green opal. Carnotite, the only identified uranium mineral, occurs as fracture coatings or fine layers in the opal; in places, no uranium minerals are visible in the radioactive opal. The opal layers are irregular in extent and thickness. The exposed length of the layers ranges from 8 to 1, 200 ft or more, and the thickness of the layers ranges from 0. 1 to 3. 9 ft. The uranium content of each opal layer, and of different parts of the same layer, differs widely. On the east side of Virgin Valley four of the seven observed opal layers, nos. 3, 4, 5, and 7, are more radioactive than the average; and the uranium content ranges from 0. 002 to 0. 12 percent. Two samples, taken 5 ft apart across opal layer no. 7, contained 0. 003 and 0. -049 percent uranium. On the west side of the valley only four of the fifteen observed opal layers, nos; 9, , 10, 14, and 15, are more radioactive than the average; and the uranium content ranges from 0. 004 to 0. 047 percent. Material of the highest grade was found in a small discontinuous layer of pale-green opal (no. 4) on the east side of Virgin Valley. The grade of this layer ranged from 0. 027 to 0. 12 percent uranium.

  2. Humboldt's Octoberfest.

    ERIC Educational Resources Information Center

    Elliott, Anna Bunker

    1986-01-01

    Describes the Author Festival held every two years in Humboldt County, California, at which students meet authors of juvenile and young adult books. Though the festival focuses on the students, authors have the opportunity to discuss their works with each other, and the festival conveys appreciation of their works. (SRT)

  3. A Study of Youth Attitudes Toward Authority and Their Relation to School Adjustment Patterns. A Report Prepared by the 1973-74 Humboldt County Grand Jury, June 1974.

    ERIC Educational Resources Information Center

    Bowlus, Donald; And Others

    The Humboldt County Grand Jury (1973-74) examined the attitudes of high school youths toward law enforcement in the California county. Since these are sensitive indicators of their attitudes toward authority in general, results should not be interpreted as being exclusively relevant to law enforcement. The study covered a 4 month period, sampling…

  4. 23. MADISON GRANT TABLET AT PRAIRIE CREEK STATE PARK. HUMBOLDT ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    23. MADISON GRANT TABLET AT PRAIRIE CREEK STATE PARK. HUMBOLDT COUNTY, CALIFORNIA. LOOKING W. - Redwood National & State Parks Roads, California coast from Crescent City to Trinidad, Crescent City, Del Norte County, CA

  5. 77 FR 51556 - Sheldon National Wildlife Refuge, Humboldt County and Washoe County, NV; Lake County, OR; Final...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-08-24

    ... Fish and Wildlife Service Sheldon National Wildlife Refuge, Humboldt County and Washoe County, NV; Lake... notice in the Federal Register (73 FR 27003; May 12, 2008). We released the draft CCP/EIS to the public, announcing and requesting public comments in a notice of availability in the Federal Register (76 FR...

  6. Permian and Triassic rocks near Quinn River Crossing, Humboldt County, Nevada

    NASA Astrophysics Data System (ADS)

    Ketner, Keith B.; Wardlaw, Bruce R.

    1981-03-01

    Permian and Triassic rocks near Quinn River Crossing, Humboldt County, Nevada, consist of four structural blocks: (1) a Lower Permian volcanic block; (2) a Permian(?) chert-arenite block; (3) a Lower Permian limestone block; and (4) a Permian and Triassic block. The contacts between the Permian volcanic block and the others are interpreted as thrust faults or glide surfaces. None of these rocks are metamorphosed, in contrast to those of the surrounding mountain ranges. Each of the blocks is lithically similar in some respects to rocks of the Osgood Mountains area 80 km to the southeast. The fusulinid and brachiopod faunas of two of the blocks display affinities to those of the McCloud Limestone of northern California and the Coyote Butte Limestone of central Oregon, and the fauna of another block has elements in common with autochthonous rocks of eastern Nevada and Utah. All four blocks probably are allochthonous with respect to the rocks exposed in the surrounding mountain ranges, but their points of origin remain obscure. The rocks at Quinn River Crossing provide a link among the Permian rocks of north-central Nevada, northern California, and central Oregon and a possible key to their original relations, but more comparative data are needed.

  7. Seismic Line Location Map Hot Pot Project, Humboldt County, Nevada 2010

    DOE Data Explorer

    Michael Lane

    2010-01-01

    Seismic Line Location Map Hot Pot Project, Humboldt County, Nevada 2010. ArcGIS map package containing topographic base map, Township and Range layer, Oski BLM and private leases at time of survey, and locations, with selected shot points, of the five seismic lines.

  8. Blue Mountain, Humboldt County, Nevada, U.S.A

    SciTech Connect

    Ted Fitzpatrick, Brian D. Fairbank

    2005-04-01

    The report documents the drilling of well Deep Blue No.2, the second deep geothermal test hole at the Blue Mountain Geothermal Area, Humboldt County, Nevada. The well was drilled by Noramex Corp, a Nevada company, with funding support from the US Department of Energy, under the DOE’s GRED II Program. Deep Blue No.2 was drilled as a ‘step-out’ hole from Deep Blue No.1, to further evaluate the commercial potential of the geothermal resource. Deep Blue No.2 was designed as a vertical, slim observation test hole to a nominal target depth of 1000 meters (nominal 3400 feet). The well tests an area of projected high temperatures at depth, from temperature gradients measured in a group of shallow drill holes located approximately one kilometer to the northeast of observation hole Deep Blue No.1. The well is not intended for, or designed as, a commercial well or a production well. Deep Blue No.2 was spudded on March 25, 2004 and completed to a total depth of 1127.76m (3700 ft) on April 28, 2004. The well was drilled using conventional rotary drilling techniques to a depth of 201.17 m (660 ft), and continuously cored from 201.17m (660 ft) to 1127.76m (3700 ft). A brief rig-on flow-test was conducted at completion to determine basic reservoir parameters and obtain fluid samples. A permeable fracture zone with measured temperatures of 150 to 167°C (302 to 333°F) occurs between 500 to 750m (1640 to 2461ft). The well was left un-lined in anticipation of the Phase III - Flow and Injection Testing. A further Kuster temperature survey was attempted after the well had been shut in for almost 3 weeks. The well appears to have bridged off at 439m (1440ft) as the Kuster tool was unable to descend past this point. Several attempts to dislodge the obstruction using tube jars were unsuccessful. Deep Blue No.2 encountered variably fractured and veined, fine-grained rocks of the Singas Formation, and intruded by minor strongly altered fine-grained felsic dikes, and less altered

  9. Late Cenozoic history of Humboldt basin, Cape Mendocino area, California

    SciTech Connect

    McCrory, P.A.

    1988-03-01

    The Humboldt basin is a filled Neogene trench-slope basin within the accretionary complex immediately north of the Mendocino triple junction and adjacent to the underthrusting Juan de Fuca plate. This particular basin provides a unique opportunity for studying the transition from convergent to transform motion because of its proximity to the Mendocino triple junction. Moreover, the basin experienced almost continuous sedimentation throughout the late Neogene, and therefore yields a detailed stratigraphic record of basin deformation due to plate motion. Basin stratigraphy has recorded deformation of the upper surface of the Juan de Fuca accretionary complex as it was uplifted from lower bathyal to littoral depths during the Neogene. Geohistory analysis of Humboldt basin is based on key Neogene surface sections and detailed micropaleontologic and sedimentologic studies that are used to evaluate age and changing climate, water depth, and depositional environment through time along a trend perpendicular to the paleomargin. Oldest basin sediments consist mainly of hemipelagic mudstones deposited in a deep-water setting during elevated sea level 14-8 Ma. Turbidite sandstone intervals become common after about 3.5 Ma and can be divided into several discrete megasequence packages. Deposition of these megasequences was apparently influenced by climatically induced lowering of sea level and tectonic uplift of the adjacent coastal area. Turbidite deposition was followed by slope deposition starting about 2.2 Ma. A stratigraphic section near the eastern margin of the basin contains a thick slope, shelf, beach, fluvial sequence clearly influenced by eustatic sea level events. Humboldt basin has experienced uplift and deformation due to tectonic underthrusting and outbuilding of the accretionary prism associated with convergence of the Juan de Fuca plate.

  10. Improving Estimates of Coseismic Subsidence from southern Cascadia Subduction Zone Earthquakes at northern Humboldt Bay, California

    NASA Astrophysics Data System (ADS)

    Padgett, J. S.; Engelhart, S. E.; Hemphill-Haley, E.; Kelsey, H. M.; Witter, R. C.

    2015-12-01

    Geological estimates of subsidence from past earthquakes help to constrain Cascadia subduction zone (CSZ) earthquake rupture models. To improve subsidence estimates for past earthquakes along the southern CSZ, we apply transfer function analysis on microfossils from 3 intertidal marshes in northern Humboldt Bay, California, ~60 km north of the Mendocino Triple Junction. The transfer function method uses elevation-dependent intertidal foraminiferal and diatom assemblages to reconstruct relative sea-level (RSL) change indicated by shifts in microfossil assemblages. We interpret stratigraphic evidence associated with sudden shifts in microfossils to reflect sudden RSL rise due to subsidence during past CSZ earthquakes. Laterally extensive (>5 km) and sharp mud-over-peat contacts beneath marshes at Jacoby Creek, Mad River Slough, and McDaniel Slough demonstrate widespread earthquake subsidence in northern Humboldt Bay. C-14 ages of plant macrofossils taken from above and below three contacts that correlate across all three sites, provide estimates of the times of subsidence at ~250 yr BP, ~1300 yr BP and ~1700 yr BP. Two further contacts observed at only two sites provide evidence for subsidence during possible CSZ earthquakes at ~900 yr BP and ~1100 yr BP. Our study contributes 20 AMS radiocarbon ages, of identifiable plant macrofossils, that improve estimates of the timing of past earthquakes along the southern CSZ. We anticipate that our results will provide more accurate and precise reconstructions of RSL change induced by southern CSZ earthquakes. Prior to our work, studies in northern Humboldt Bay provided subsidence estimates with vertical uncertainties >±0.5 m; too imprecise to adequately constrain earthquake rupture models. Our method, applied recently in coastal Oregon, has shown that subsidence during past CSZ earthquakes can be reconstructed with a precision of ±0.3m and substantially improves constraints on rupture models used for seismic hazard

  11. Truancy in Yolo County, California.

    ERIC Educational Resources Information Center

    Sommer, Barbara; Tyburczy, Jason

    The problem of truancy in the elementary and junior high schools of California's Yolo County was investigated during the 1980-81 academic year by means of questionnaires completed by 16 school principals and interviews with 30 people representing schools, school district offices, law enforcement agencies, the Department of Social Services, and the…

  12. Documentation of model input and output values for simulation of pumping effects in Paradise Valley, a basin tributary to the Humboldt River, Humboldt County, Nevada

    USGS Publications Warehouse

    Carey, A.E.; Prudic, D.E.

    1996-01-01

    Documentation is provided of model input and sample output used in a previous report for analysis of ground-water flow and simulated pumping scenarios in Paradise Valley, Humboldt County, Nevada.Documentation includes files containing input values and listings of sample output. The files, in American International Standard Code for Information Interchange (ASCII) or binary format, are compressed and put on a 3-1/2-inch diskette. The decompressed files require approximately 8.4 megabytes of disk space on an International Business Machine (IBM)- compatible microcomputer using the MicroSoft Disk Operating System (MS-DOS) operating system version 5.0 or greater.

  13. Material properties of Pacific hake, Humboldt squid, and two species of myctophids in the California Current.

    PubMed

    Becker, Kaylyn N; Warren, Joseph D

    2015-05-01

    Material properties of the flesh from three fish species (Merluccius productus, Symbolophorus californiensis, and Diaphus theta), and several body parts of the Humboldt squid (Dosidicus gigas) collected from the California Current ecosystem were measured. The density contrast relative to seawater varied within and among taxa for fish flesh (0.9919-1.036), squid soft body parts (mantle, arms, tentacle, braincase, eyes; 1.009-1.057), and squid hard body parts (beak and pen; 1.085-1.459). Effects of animal length and environmental conditions on nekton density contrast were investigated. The sound speed contrast relative to seawater varied within and among taxa for fish flesh (0.986-1.027) and Humboldt squid mantle and braincase (0.937-1.028). Material properties in this study are similar to values from previous studies on species with similar life histories. In general, the sound speed and density of soft body parts of fish and squid were 1%-3% and 1%-6%, respectively, greater than the surrounding seawater. Hard parts of the squid were significantly more dense (6%-46%) than seawater. The material properties reported here can be used to improve target strength estimates from acoustic scattering models, which could increase the accuracy of biomass estimates from acoustic surveys for these nekton. PMID:25994685

  14. Dispersion analysis of Humboldt Bay, California, interim offshore disposal site. Final report

    SciTech Connect

    Scheffner, N.W.

    1992-06-01

    The dispersive characteristics of an interim offshore dredged material disposal site located seaward of the entrance to Humboldt Bay, California, are investigated. These characteristics must be known to determine potential impact of the dredging operation on the local environment. Two phases of investigation were employed. A short-term analysis of the disposal operation was conducted to examine the immediate fate of material following release from the barge and subsequent descent to the ocean bottom. The second phase examined the long-term fate to determine whether local ocean currents are capable of eroding and transporting deposited material beyond the designated limits of the site. Results of this study indicate the site to be nondispersive, with little erosion and transport of material indicated under both normal and moderate storm conditions. Disposal site classification, Sediment fate, Disposal site stability, Sediment transport, Dredged material.

  15. Age and composition of igneous rocks, Edna Mountain quadrangle, Humboldt County, Nevada

    USGS Publications Warehouse

    Erickson, Ralph L.; Silberman, Miles L.; Marsh, S.P.

    1978-01-01

    Six pulses of igneous activity ranging in age from Jurassic to Pliocene have been identified in the Edna Mountain quadrangle, Humboldt County, Nev. Porphyritic syenite am! quartz monzonite of Jurassic age (146-164 million years) at Buffalo Mountain are highly potassic through a wide range in SiO2 content from olivine-bearing syenite to quartz-rich monzonite, and their composition contrasts sharply with plutons elsewhere in north-central Nevada. Granodiorite and quartz monzonite plutons of Cretaceous age (88- 106 m.y.) are chemically and mineralogically similar to other calc-alkaline plutons in north-central Nevada. Four episodes of Tertiary volcanism include rhyolite ashflow tuffs and slightly younger andesitic basalt flows and tuffs of Oligocene age, rhyolite vitrophyre of late Miocene age, and olivine basalt flows of Pliocene age. Their age and mineralogical and chemical compositions are similar to other Tertiary volcanic rocks in north-central Nevada.

  16. Geologic map of the South Jackson Mountains Wilderness Study Area, Humboldt County, Nevada

    USGS Publications Warehouse

    Sorensen, Martin L.

    1986-01-01

    The South Jackson Mountains Wilderness Study Area is in south-central Humboldt County, approximately 50 miles northwest of Winnemucca, Nevada. The boundaries originally specified for the wilderness study area encompassed an area of 60,211 acres. The draft Environmental Impact Statement issued in 1983 by the U.S. Bureau of Land Management (BLM) identified 20,094 acres within the wilderness study area as potentially suitable for inclusion into the National Wilderness Preservation System. Subsequent (August 27, 1984) deletions by the BLM have resulted in the present study area of approximately 10,300 acres. The boundaries of the study area are approximated by the range crestline to the east and the 4,400-ft contour along the west side of the range from King Lear Peak north to the divide between Hobo and Christiorsson Canyons.

  17. THE MISSING EARTHQUAKES OF HUMBOLDT COUNTY: RECONCILING RECURRENCE INTERVAL ESTIMATES, SOUTHERN CASCADIA SUBDUCTION ZONE

    NASA Astrophysics Data System (ADS)

    Patton, J. R.; Leroy, T. H.

    2009-12-01

    Earthquake and tsunami hazard for northwestern California and southern Oregon is predominately based on estimates of recurrence for earthquakes on the Cascadia subduction zone and upper plate thrust faults, each with unique deformation and recurrence histories. Coastal northern California is uniquely located to enable us to distinguish these different sources of seismic hazard as the accretionary prism extends on land in this region. This region experiences ground deformation from rupture of upper plate thrust faults like the Little Salmon fault. Most of this region is thought to be above the locked zone of the megathrust, so is subject to vertical deformation during the earthquake cycle. Secondary evidence of earthquake history is found here in the form of marsh soils that coseismically subside and commonly are overlain by estuarine mud and rarely tsunami sand. It is not currently known what the source of the subsidence is for this region; it may be due to upper plate rupture, megathrust rupture, or a combination of the two. Given that many earlier investigations utilized bulk peat for 14C age determinations and that these early studies were largely reconnaissance work, these studies need to be reevaluated. Recurrence Interval estimates are inconsistent when comparing terrestrial (~500 years) and marine (~220 years) data sets. This inconsistency may be due to 1) different sources of archival bias in marine and terrestrial data sets and/or 2) different sources of deformation. Factors controlling successful archiving of paleoseismic data are considered as this relates to geologic setting and how that might change through time. We compile, evaluate, and rank existing paleoseismic data in order to prioritize future paleoseismic investigations. 14C ages are recalibrated and quality assessments are made for each age determination. We then evaluate geologic setting and prioritize important research locations and goals based on these existing data. Terrestrial core

  18. Confirmatory Survey of the Fuel Oil Tank Area - Humboldt Bay Power Plant, Eureka, California

    SciTech Connect

    ADAMS, WADE C

    2012-04-09

    During the period of February 14 to 15, 2012, ORISE performed radiological confirmatory survey activities for the former Fuel Oil Tank Area (FOTA) and additional radiological surveys of portions of the Humboldt Bay Power Plant site in Eureka, California. The radiological survey results demonstrate that residual surface soil contamination was not present significantly above background levels within the FOTA. Therefore, it is ORISE’s opinion that the radiological conditions for the FOTA surveyed by ORISE are commensurate with the site release criteria for final status surveys as specified in PG&E’s Characterization Survey Planning Worksheet. In addition, the confirmatory results indicated that the ORISE FOTA survey unit Cs-137 mean concentrations results compared favorably with the PG&E FOTA Cs-137 mean concentration results, as determined by ORISE from the PG&E characterization data. The interlaboratory comparison analyses of the three soil samples analyzed by PG&E’s onsite laboratory and the ORISE laboratory indicated good agreement for the sample results and provided confidence in the PG&E analytical procedures and final status survey soil sample data reporting.

  19. Uranium occurrences at the Moonlight Mine and Granite Point claims, Humboldt County, Nevada

    USGS Publications Warehouse

    Taylor, Allen O.; Powers, James Farl

    1955-01-01

    The Moonlight mine and Granite Foint claims are on the western flank of the Double H Mountains between the Kings River and Quinn, River valleys in northern Humboldt County, Nev. Uranium minerals at the Moonlight mine occur in a vein in intensely altered Tertiary volcanic rocks. The knovm uranium mineralization is spotty and erratic, but ore-grade material is present in the vein. Samples of the vein taken along its outcrop and in the mine shaft contain from less than 0.02 percent to 0.40 percent U308. The uranium minerals change from autunite at the surface to torbernite, 'gummite(?)' and pitchblende below the 90-foot level of the shaft. The Granite Point claims are two miles north of the Moonlight mine at the base of a rhyolite cliff. Radioactivity traverses made along the base and slope of the rhyolite cliff indicate that a large part of the rhyolite is abnormally radioactive. Radioactivity ranges from 0.013 to 0.3 mr/hr and averaged 0.10 mr/hr. in the vicinity of the claims. A sample taken at the base of the rhyolite cliff, at the point of highest radioactivity c6ntains 0.02 percent U3O8.

  20. Geology of the Humboldt region and the Iron King mine, Bigbug mining district, Yavapai County, Arizona

    USGS Publications Warehouse

    Creasey, Saville Cyrus

    1951-01-01

    The Humboldt region is in central Yavapai County, Arizona. The intersection of the 112? 15' meridian and the 34? 30' N parallel is in the approximate geographical center of the region, and the Iron King mine is about 2000 feet west-northwest of the intersection. Pre-Cambrian rocks form the bedrock in the Humboldt region. Late Cenozoic unconsolidated river wash and valley fill, including some interbedded basalt, locally mantle the pre-Cambrian rocks, especially in the north-central part of the region (Lonesome Valley). The pre-Cambrian rocks consist of five newly defined metavolcanic formations derived from flows and tuff s, and of six intrusive units ranging in composition from granite to gabbro or perhaps more mafic types. Relic bedding-and pillow structures are locally prominent in the metavolcanics; geopetal structures are uncommon, but where present, generally indicate that the top is toward the west, though the evidence is too meager to be conclusive. Low-grade dynamothermal metamorphism altered the metavolcanics and to a lesser extent the intrusive rocks, forming textures, structures, and mineral assemblages characteristic of low temperature and moderate stress. The Texas Gulch formation, which is the easternmost metavolcanic formation, consists of five lithologic units. Arranged in the general order of their appearance from east to west they are meta-andesite breccia, purple slate, metarhyolite tuff, meta-andesite, and green slate. The boundary between the Texas Gulch formation and the Iron King meta-andesite is apparently gradational. The Iron King meta-andesite consists of three meta-andesite tuff units, two meta-andesite flow units and one metarhyolite tuff and conglomerate unit. The assemblage chlorite-albite-epitode with or without quartz is dominant in the meta-andesites. Mafic intrusive rocks, which may be approximately contemporaneous with metamorphism, may explain the presence of actinolitic hornblende in the central part of the formation. Toward

  1. COUNTIES OF CALIFORNIA - WITH FARM STATISTICS

    EPA Science Inventory

    County farming statistics polygon coverage of California. The statistics were taken from the 1997 Census of Agriculture and added to a coverage extracted from TIGER county boundaries. A farm is any place from which $1,000 or more of agricultural products were sold, or normally w...

  2. Behaviour of wintering Tundra Swans Cygnus columbianus columbianus at the Eel River delta and Humboldt Bay, California, USA

    USGS Publications Warehouse

    Black, Jeffrey M.; Gress, Carol; Byers, Jacob W.; Jennings, Emily; Ely, Craig

    2010-01-01

    Tundra Swan Cygnus columbianus columbinanus phenology and behaviour at the Eel River delta and southern Humboldt Bay in northern California, USA, is described. Counts made each January from 1963 onwards peaked at 1,502 swans in 1988. Monthly counts recorded during the 2006/07 and 2008/09 winters peaked in February, at 1,033 and 772 swans respectively. Swans roosted on ephemeral ponds at the Humboldt Bay National Wildlife Refuge, on ephemeral ponds within grassland pastures in the vicinity of the Refuge, and perhaps also used the Eel River as a roost. Flights between Refuge roosts and the pastures and ponds occurred in the two hours after sunrise and before dark. In winters 2008/09 and 2009/10, the percentage of cygnets in the flocks was 10.6% and 21.4% respectively, and increased to =31% cygnets each year after most swans had departed from the area in March. Average brood size in 2009/10 was 2.1 cygnets. Daily activities consisted of foraging (44.9% of activities recorded), comfort behaviour (22.1%), locomotion (16.2%) and vigilance (15.5%). Eight neck-collared swans identified in the wintering flock were marked at four locations in different parts of Alaska, up to 1,300 km apart.

  3. GENERAL SITE PLAN, HAMILTON AIR FORCE BASE, MARIN COUNTY, CALIFORNIA. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    GENERAL SITE PLAN, HAMILTON AIR FORCE BASE, MARIN COUNTY, CALIFORNIA. Pencil on paper, dated December 4, 1952. Also marked "PWC 103474." By J.Y. Long Company, Engineers, Oakland, California - Hamilton Field, East of Nave Drive, Novato, Marin County, CA

  4. Ground-water flow and simulated effects of development in Paradise Valley, a basin tributary to the Humboldt River in Humboldt County, Nevada

    USGS Publications Warehouse

    Prudic, D.E.; Herman, M.E.

    1996-01-01

    A computer model was used to characterize ground-water flow in Paradise Valley, Nevada, and to evaluate probable long-term effects of five hypothetical development scenarios. One finding of the study is that concentrating pumping at the south end of Paradise Valley may increase underflow from the adjacent Humboldt River valley, and might affect flow in the river.

  5. California County Data Book 1995.

    ERIC Educational Resources Information Center

    Children Now, Oakland, CA.

    This data book examines statewide trends in the well-being of California's children. The report begins with highlights of findings and focuses on teens in the areas of teen births and gun violence. The report then lists summary tables for the state for 17 indicators of child well being in the areas of: (1) family economics; (2) education; (3)…

  6. 75 FR 54297 - Humboldt Resource Advisory Committee (RAC)

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-07

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF AGRICULTURE Forest Service Humboldt Resource Advisory Committee (RAC) AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The Humboldt Resource Advisory Committee (RAC) will meet in Eureka, California....

  7. 75 FR 27703 - Humboldt Resource Advisory Committee (RAC)

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-05-18

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF AGRICULTURE Forest Service Humboldt Resource Advisory Committee (RAC) AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The Humboldt Resource Advisory Committee (RAC) will meet in Eureka, California....

  8. 76 FR 2883 - Humboldt Resource Advisory Committee (RAC)

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-01-18

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF AGRICULTURE Forest Service Humboldt Resource Advisory Committee (RAC) AGENCY: Forest Service, USDA. ACTION: Notice of Meeting. SUMMARY: The Humboldt Resource Advisory Committee (RAC) will meet in Eureka, California....

  9. 75 FR 36061 - Humboldt Resource Advisory Committee (RAC)

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-06-24

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF AGRICULTURE Forest Service Humboldt Resource Advisory Committee (RAC) AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The Humboldt Resource Advisory Committee (RAC) will meet in Eureka, California....

  10. 75 FR 43140 - Humboldt Resource Advisory Committee (RAC)

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-23

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF AGRICULTURE Forest Service Humboldt Resource Advisory Committee (RAC) AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The Humboldt Resource Advisory Committee (RAC) will meet in Eureka, California....

  11. 75 FR 69620 - Humboldt Resource Advisory Committee (RAC)

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-11-15

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF AGRICULTURE Forest Service Humboldt Resource Advisory Committee (RAC) AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The Humboldt Resource Advisory Committee (RAC) will meet in Eureka, California....

  12. Northern Indian California Education Project; An Analysis of Responses by Practicing School Psychologists on a Pre-Questionaire.

    ERIC Educational Resources Information Center

    Tarbet, Don; Miles, Marilyn

    School psychologists (13) representing the 6 counties served by the Northern Indian California Education Project (Title III, Elementary and Secondary Education Act) attended a workshop on January 14, 1972, at Humboldt State College. Also attending were Humboldt State personnel from the fields of education and psychology. The workshop was intended…

  13. 78 FR 68135 - Environmental Impact Statement: Los Angeles County, California

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-11-13

    ... Federal Highway Administration Environmental Impact Statement: Los Angeles County, California AGENCY... Environmental Impact Statement will be prepared for a proposed highway project in Los Angeles County, California... place of the hearing. The Draft Environmental Impact Statement will be available for public and...

  14. 76 FR 20942 - Humboldt (NV) Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-04-14

    ... Forest Service Humboldt (NV) Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The Humboldt (NV) Resource Advisory Committee will meet in Winnemucca, Nevada. The.... to 5:30 p.m. ADDRESSES: The meeting will be held at the Humboldt County Court House Room 201, 50...

  15. 76 FR 34203 - Humboldt (NV) Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-06-13

    ...; ] DEPARTMENT OF AGRICULTURE Forest Service Humboldt (NV) Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The Humboldt (NV) Resource Advisory Committee (RAC) will meet.... ADDRESSES: The July 7th meeting will be held at the Humboldt County Library, 85 East 5th St.,...

  16. Travertine Hot Springs, Mono County, California

    SciTech Connect

    Chesterman, C.W.; Kleinhampl, F.J.

    1991-08-01

    This article is an abridgement of Special Report 172, Travertine Hot Springs at Bridgeport, Mono County, California, in preparation at the California Division of Mines and Geology. The Travertine Hot Springs area is on the northern edge of what many consider to be one of the most tectonically active areas in the United States. There is abundant geothermal and seismic activity. The landscape is dotted with volcanic features- cones, craters, domes, flows, fumaroles and hot springs-indicators of unrest in the present as well as reminders of activity in the past. Travertine, also known as calcareous sinter, is limestone formed by chemical precipitation of calcium carbonate (CaCO{sub 3}) from ground or surface waters. It forms stalactites and stalagmites in caves, fills some veins and spring conduits and can also be found at the mouths of springs, especially hot springs. The less compact variety is called tufa and the dense, banded variety is known as Mexican onyx, or onyx marble. True onyx, however, is a banded silicate.

  17. Space Radar Image of Ventura County, California

    NASA Technical Reports Server (NTRS)

    1994-01-01

    This radar image of Ventura County, California, shows the Santa Clara River valley and the surrounding mountains. The river valley is the linear feature that extends from the lower right to the upper left (east to west), where it empties into the Pacific Ocean (dark patches in upper and lower left). The cities of Ventura and Oxnard are seen along the left side of the image. Simi Valley is located in the lower center of the image, between the Santa Monica Mountains (purple area in lower left) and the Santa Susanna Mountains to the north. This area of California is known for its fruit; strawberry fields are shown in red and purple rectangular areas on the coastal plain, and citrus groves are the yellow green areas adjacent to the river. This image is centered at 34.33 degrees north latitude, 119 degrees west longitude. The area shown is approximately 53 kilometers by 35 kilometers (33 miles by 22 miles). Colors are assigned to different radar frequencies and polarizations as follows: red is L-band, horizontally transmitted, horizontally received; green is L-band, horizontally transmitted, vertically received; blue is C-band, horizontally transmitted, vertically received. The image was acquired by the Spaceborne Imaging Radar-C/X-band Synthetic Aperture (SIR-C/X-SAR) imaging radar when it flew aboard the space shuttle Endeavour on October 6, 1994.

  18. Evolution of a trench-slope basin within the Cascadia subduction margin: the Neogene Humboldt Basin, California

    USGS Publications Warehouse

    McCrory, P.A.

    1995-01-01

    The Neogene Humboldt (Eel River) Basin is located along the north-eastern margin of the Pacific Ocean within the Cascadia subduction zone. This sedimentary basin originated near the base of the accretionary prism in post-Eocene time. Subduction processes since that time have elevated strata in the south-eastern portion of the basin above sea level. High-resolution chronostratigraphic data from the onshore portion of the Humboldt Basin enable correlation of time-equivalent lithofacies across the palaeomargin, reconstruction of slope-basin evolution, and preliminary delineation of climatic and tectonic influence on lithological variation. -from Author

  19. The application of LANDSAT remote sensing technology to natural resources management. Section 1: Introduction to VICAR - Image classification module. Section 2: Forest resource assessment of Humboldt County.

    NASA Technical Reports Server (NTRS)

    Fox, L., III (Principal Investigator); Mayer, K. E.

    1980-01-01

    A teaching module on image classification procedures using the VICAR computer software package was developed to optimize the training benefits for users of the VICAR programs. The field test of the module is discussed. An intensive forest land inventory strategy was developed for Humboldt County. The results indicate that LANDSAT data can be computer classified to yield site specific forest resource information with high accuracy (82%). The "Douglas-fir 80%" category was found to cover approximately 21% of the county and "Mixed Conifer 80%" covering about 13%. The "Redwood 80%" resource category, which represented dense old growth trees as well as large second growth, comprised 4.0% of the total vegetation mosaic. Furthermore, the "Brush" and "Brush-Regeneration" categories were found to be a significant part of the vegetative community, with area estimates of 9.4 and 10.0%.

  20. Denverton Creek gas field, Solano County, California

    SciTech Connect

    Lindblom, R.G.; Jacobson, J.B.

    1988-02-01

    The Denverton Creek gas field is located in Solano County, California, 40 mi northeast of San Francisco on the west side of the Sacramento Valley. The field was discovered in 1966 by the Mobil Oil Corporation Trojan Powder 1 well from a sand of Paleocene age within the Martinez channel. During 1967 and 1968, new pool discoveries were made in other Paleocene sands. Commercial gas deliveries began in March 1967 and ceased in 1971, and the field was abandoned in 1973 with a cumulative production of 712 million ft/sup 3/ of gas from three wells. Increases in natural gas prices during the middle and late 1970s, coupled with sound geological concepts supported by improved seismic data, led to a number of discoveries in the valley. Included in this effort was reestablishment of production at Denverton Creek in 1977 by new drilling. Chevron USA, in joint ventures with Cities Service and Channel Exploration, has drilled nine wells in the field, which developed two new pool discoveries. In 1986, the field produced 5 bcf of gas from 11 wells. Gas entrapment in the Denverton Creek field is caused by a number of anomalies, including sand pinch-out, faulting, and truncations by unconformities and the Martinez channel. Although these types of entrapping mechanisms are found in other fields in the Sacramento Valley, the Denverton Creekfield is unique in that all are present in one producing area.

  1. 76 FR 12317 - Tehama County Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-03-07

    ... Forest Service Tehama County Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The Tehama County Resource Advisory Committee (RAC) will meet in Red Bluff, California..., Mendocino National Forest, Grindstone Ranger District, 825 N. Humboldt Ave, Willows, CA 95988. (530)...

  2. 76 FR 20310 - Tehama County Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-04-12

    ... Forest Service Tehama County Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of Meeting. SUMMARY: The Tehama County Resource Advisory Committee (RAC) will meet in Red Bluff, California..., Committee Coordinator, USDA, Mendocino National Forest, Grindstone Ranger District, 825 N. Humboldt...

  3. 75 FR 9574 - Tehama County Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-03-03

    ... Forest Service Tehama County Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of Meeting. SUMMARY: The Tehama County Resource Advisory Committee (RAC) will meet in Red Bluff, California..., Mendocino National Forest, Grindstone Ranger District, 825 N. Humboldt Ave, Willows, CA 95988. (530)...

  4. 75 FR 55738 - Tehama County Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-14

    ... Forest Service Tehama County Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of Meeting. SUMMARY: The Tehama County Resource Advisory Committee (RAC) will meet in Red Bluff, California... Coordinator, USDA, Mendocino National Forest, Grindstone Ranger District, 825 N. Humboldt Ave., Willows,...

  5. 76 FR 34648 - Tehama County Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-06-14

    ... Forest Service Tehama County Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of Meeting. SUMMARY: The Tehama County Resource Advisory Committee (RAC) will meet in Red Bluff, California..., Committee Coordinator, USDA, Mendocino National Forest, Grindstone Ranger District, 825 N. Humboldt...

  6. 75 FR 18146 - Tehama County Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-09

    ... Forest Service Tehama County Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The Tehama County Resource Advisory Committee (RAC) will meet in Red Bluff, California..., Mendocino National Forest, Grindstone Ranger District, 825 N. Humboldt Ave., Willows, CA 95988. (530)...

  7. 76 FR 50994 - Tehama County Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-08-17

    ... Forest Service Tehama County Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The Tehama County Resource Advisory Committee (RAC) will meet in Red Bluff, California... Coordinator, USDA, Mendocino National Forest, Grindstone Ranger District, 825 N. Humboldt Ave., Willows,...

  8. CONFIRMATORY SURVEY RESULTS FOR PORTIONS OF THE MATERIALS AND EQUIPMENT FROM UNITS 1 AND 2 AT THE HUMBOLDT BAY POWER PLANT, EUREKA, CALIFORNIA

    SciTech Connect

    W.C. Adams

    2011-04-01

    The Pacific Gas & Electric Company (PG&E) operated the Humboldt Bay Power Plant (HBPP) Unit 3 nuclear reactor near Eureka, California under Atomic Energy Commission (AEC) provisional license number DPR-7. HBPP Unit 3 achieved initial criticality in February 1963 and began commercial operations in August 1963. Unit 3 was a natural circulation boiling water reactor with a direct-cycle design. This design eliminated the need for heat transfer loops and large containment structures. Also, the pressure suppression containment design permitted below-ground construction. Stainless steel fuel claddings were used from startup until cladding failures resulted in plant system contamination—zircaloy-clad fuel was used exclusively starting in 1965 eliminating cladding-related contamination. A number of spills and gaseous releases were reported during operations resulting in a range of mitigative activities (see ESI 2008 for details).

  9. El Niño and similar perturbation effects on the benthos of the Humboldt, California, and Benguela Current upwelling ecosystems

    NASA Astrophysics Data System (ADS)

    Arntz, W. E.; Gallardo, V. A.; Gutiérrez, D.; Isla, E.; Levin, L. A.; Mendo, J.; Neira, C.; Rowe, G. T.; Tarazona, J.; Wolff, M.

    2006-03-01

    To a certain degree, Eastern Boundary Current (EBC) ecosystems are similar: Cold bottom water from moderate depths, rich in nutrients, is transported to the euphotic zone by a combination of trade winds, Coriolis force and Ekman transport. The resultant high primary production fuels a rich secondary production in the upper pelagic and nearshore zones, but where O2 exchange is restricted, it creates oxygen minimum zones (OMZs) at shelf and upper slope (Humboldt and Benguela Current) or slope depths (California Current). These hypoxic zones host a specifically adapted, small macro- and meiofauna together with giant sulphur bacteria that use nitrate to oxydise H2S. In all EBC, small polychaetes, large nematodes and other opportunistic benthic species have adapted to the hypoxic conditions and co-exist with sulphur bacteria, which seem to be particularly dominant off Peru and Chile. However, a massive reduction of macrobenthos occurs in the core of the OMZ. In the Humboldt Current area the OMZ ranges between <100 and about 600 m, with decreasing thickness in a poleward direction. The OMZ merges into better oxygenated zones towards the deep sea, where large cold-water mega- and macrofauna occupy a dominant role as in the nearshore strip. The Benguela Current OMZ has a similar upper limit but remains shallower. It also hosts giant sulphur bacteria but little is known about the benthic fauna. However, sulphur eruptions and intense hypoxia might preclude the coexistence of significant mega- und macrobenthos. Conversely, off North America the upper limit of the OMZ is considerably deeper (e.g., 500-600 m off California and Oregon), and the lower boundary may exceed 1000m. The properties described are valid for very cold and cold (La Niña and "normal") ENSO conditions with effective upwelling of nutrient-rich bottom water. During warm (El Niño) episodes, warm water masses of low oxygen concentration from oceanic and equatorial regions enter the upwelling zones, bringing a

  10. Geochemical, aeromagnetic, and generalized geologic maps showing distribution and abundance of antimony and tungsten, Golconda and Iron Point quadrangles, Humboldt County, Nevada

    USGS Publications Warehouse

    Erickson, R.L.; Marsh, S.P.

    1971-01-01

    Detailed geologic and geochemical studies of the four 7 1/2-minute quadrangles that make up the Edna Mountain 15-minute quadrangle in Humboldt County, Nevada, were begun during the 1969 summer field season. The objectives of the project are to map the geology of this structurally complex area at 1:24,000 scale and to determine the regional distribution and abundance of metals in rocks of the area and the factors that control the distribution and abundance of those metals. Tungsten-bearing hot-spring tufa, metalliferous black shale in Ordovician rocks , base-metal and barite deposits in Paleozoic sedimentary rocks, and copper molydbenum in granodiorite plutons of Cretaceous age occur in the Edna Mountain area. None of these deposits have been of much economic significance, although tungsten was mined from the hot-spring deposits during World War II. 

  11. Geochemical, aeromagnetic, and generalized geologic maps showing distribution and abundance of gold and copper, Golconda and Iron Point quadrangles, Humboldt County, Nevada

    USGS Publications Warehouse

    Erickson, R.L.; Marsh, S.P.

    1971-01-01

    Detailed geologic and geochemical studies of the four 7 1/2-minute quadrangles that make up the Edna Mountain 15-minute quadrangle in Humboldt County, Nevada, were begun during the 1969 summer field season.  The objectives of the project are to map the geology of this structurally complex area at 1:24,000 scale and to determine the regional distribution and abundance of metals in rocks of the area and the factors that control the distribution and abundance of those metals.  Tungsten-bearing hot-spring tufa, metalliferous black shale in Ordovician rocks, base-metal and barite deposits in Paleozoic sedimentary rocks, and copper-molybdenum in granodiorite plutons of Cretaceous age occur in the Edna Mountain area.  None of these deposits have been of much economic signigicance, although tungsten was mined from the hot-spring deposits during World War II.

  12. Geochemical, aeromagnetic, and generalized geologic maps showing distribution and abundance of mercury and arsenic, Golconda and Iron Point quadrangles, Humboldt County, Nevada

    USGS Publications Warehouse

    Erickson, R.L.; Marsh, S.P.

    1971-01-01

    Detailed geologic and geochemical studies of the four 7 1/2-minute wuadrangles that make up the Edna Mountain 15-minute quadrangle in Humboldt County, Nevada, were begun druring the 1969 summer field season. The objectives of the project are to map the geology of this structurally complex area at 1:24,000 scale and to determine the regional distribution and abundance of metals in rocks of the area and the factors that control the distribution and abundance of those metals. Tungsten-bearing hot-spring tufa, metalliferous black shale in Ordovician rocks, base-metal and barite deposits in Paleozoic sedimentary rocks, and copper-molybdenum in granodiorite plutons of Creataceous age occur in the Edna Mountain dare. None of these deposits have been of much economic significance, although tungsten was mined from the hot-spring deposits during World War II. 

  13. The California Child Care Portfolio, 1997: A Compilation of Data about Child Care, County by County.

    ERIC Educational Resources Information Center

    California Child Care Resource and Referral Network, San Francisco.

    This compendium provides standardized data on child care supply and requests for care in California. It provides county and statewide information based on responses from more than 38,000 child care providers and about 45,000 requests for child care, including: (1) key demographic statistics; (2) county population; (3) children in poverty; (4)…

  14. Returns on Investment in California County Departments of Public Health

    PubMed Central

    2016-01-01

    Objectives. To estimate the average return on investment for the overall activities of county departments of public health in California. Methods. I gathered the elements necessary to estimate the average return on investment for county departments of public health in California during the period 2001 to 2008–2009. These came from peer-reviewed journal articles published as part of a larger project to develop a method for determining return on investment for public health by using a health economics framework. I combined these elements by using the standard formula for computing return on investment, and performed a sensitivity analysis. Then I compared the return on investment for county departments of public health with the returns on investment generated for various aspects of medical care. Results. The estimated return on investment from $1 invested in county departments of public health in California ranges from $67.07 to $88.21. Conclusions. The very large estimated return on investment for California county departments of public health relative to the return on investment for selected aspects of medical care suggests that public health is a wise investment. PMID:27310339

  15. Taeniolite, an uncommon lithium-mica from Coyote Peak, Humboldt County, California.

    USGS Publications Warehouse

    Erd, Richard C.; Czamanske, G.K.; Meyer, C.E.

    1983-01-01

    Taeniolite has been found in a late pegmatitic clot in a mafic alkalic diatreme at Coyote Peak; associated species are natrolite, pectolite, aegirine, barytolamprophyllite, rasvumite and sphalerite. The taeniolite is green-brown with sp. gr. (meas.) 2.85(1) and H. 31/2. Optically it is biaxial (-) with alpha 1.541(2), beta = gamma 1.570(2), 2V approx 0o and moderate pleochroism with gamma = beta reddish-brown, alpha pale greenish brown. Single-crystal precession photographs show it to be of the 1M type, with a 5.254(2), b 9.110(4), c 10.187(2) A, beta 99.85(4)o and V = 480.4(1) A3. Combined microprobe and ion probe analyses gave SiO2 53.5, Al2O3 3.00, TiO2 1.06, FeO 3.35, MnO 0.21, MgO 18.3, Li2O 2.4, K2O 11.3, Na2O 0.27, F 6.3 = 99.69; SrO and BaO are both <0.04 wt.%; B, Be, Ca and Cl were not detected. Assuming (F + OH) = 2 and assigning 1.30 wt.% H2O gives 409(K1.01Na0.04)(Al0.01Ti0.06Fe2+0.20Mn0.01Mg1.92Li0.68)(Si3.76Al0.24)O10- (F1.40OH0.60).-G.W.R.

  16. Support Services for Exceptional Students: Butte, Del Norte, Glenn, Humboldt, Lake, Lassen, Mendocino, Modoc, Plumas, Shasta, Siskiyou, Tehama, and Trinity Counties.

    ERIC Educational Resources Information Center

    Hampel, Angelica; And Others

    Intended for use by vocational administrators responsible for mainstreaming handicapped students into vocational education classes, the resource guide lists and describes governmental and private agencies that provide vocational programs and support services for the handicapped on a local and statewide basis in the California counties of Butte,…

  17. Initial exploration results: COSO Geothermal Field Inyo County, California

    SciTech Connect

    Moore, J.L.; Austin, C.

    1983-09-01

    The Coso geothermal area in Inyo County, California is described. Extensive geological, geophysical, and geochemical studies of the area have been conducted making it one of the most thoroughly studied geothermal prospects in the US. The Coso geothermal system, its reservoir rocks and fractures, magmatic heat source, groundwater flow patterns, caprock or seals, and the Coso Navy Exploratory Well 75-7 are described.

  18. The Hmong Resettlement Study Site Report: Orange County, California.

    ERIC Educational Resources Information Center

    Cohn, Mary; And Others

    This document describes the resettlement of Hmong refugees in Orange County, California: what their employment experience has been, which resettlement efforts have been successful, and how current efforts could be altered to improve the Hmong's long term adjustment. The report is part of a larger, national project on Hmong resettlement. Much of…

  19. Seafloor off Pleasure Point, Santa Cruz County, California

    USGS Publications Warehouse

    Storlazzi, Curt D.; Golden, Nadine E.; Gibbons, Helen

    2013-01-01

    The seafloor off Pleasure Point, Santa Cruz County, California, is extremely varied, with sandy flats, boulder fields, faults, and complex bedrock ridges. These ridges support rich marine ecosystems; some of them form the "reefs" that produce world-class surf breaks. Colors indicate seafloor depth, from red-orange (about 2 meters or 7 feet) to magenta (25 meters or 82 feet)

  20. Anza-Terwilliger hydrogeologic structures in Riverside County, California

    USGS Publications Warehouse

    Morita, Andrew; Clark, Dennis A.; Morita, Andrew Y.; Martin, Peter

    2007-01-01

    This digital geospatial dataset documents the fault traces in the Anza and Terwilliger area of southwest Riverside County, California, that were modified from Moyle (1971) by Woolfenden and Bright (1988, figure 8). The fault information is used to help assess ground-water level changes in the area of Anza and Terwilliger between 2004 and 2005.

  1. 77 FR 66910 - Environmental Impact Statement, San Diego County, California

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-11-07

    ... Federal Highway Administration Environmental Impact Statement, San Diego County, California AGENCY... this notice to advise the public that the Notice of Intent to prepare an Environmental Impact Statement... environmental impacts associated with the proposed highway project. The SR-75/282 Transportation...

  2. Bilingual Education Project, Santa Clara County, California. Final Report, 1972.

    ERIC Educational Resources Information Center

    Santa Clara County Office of Education, San Jose, CA.

    The Spanish Dame Bilingual Education Project, located in Santa Clara County, California, served 190 children who came from homes where the primary language was Spanish and who resided within the target area schools of the Alum Rock School District. The objectives of the preschool project were (1) to demonstrate a home-teaching procedure designed…

  3. The California Child Care Portfolio, 2001: A Compilation of Data about Child Care in California, County by County.

    ERIC Educational Resources Information Center

    California Child Care Resource and Referral Network, San Francisco.

    This report compiles standardized data on child care supply and requests for care in California. The report provides county and statewide information based on responses from about 42,000 child care providers and more than 55,000 parents over a 3-month period and on data from state and federal government agencies, including: (1) demographic…

  4. Outdoor residential water use trends in Orange County, California

    NASA Astrophysics Data System (ADS)

    Bijoor, N. S.; Famiglietti, J. S.; Berg, J.; Baum-Haley, M.

    2012-12-01

    Irrigation is required to maintain outdoor landscapes in semi-arid climates, such as in Orange County, California. Landscape water use efficiency is a priority in Orange County, as nearly half the water supply is imported and the region is vulnerable to water shortages. The purpose of this research is to determine whether single family household residents adjust landscape irrigation based on climate or income in Orange County. Specifically, the goals were to (1) estimate the volume of single family residence (SFR) landscape irrigation applied (2) determine the depth (mm) of over- or under-irrigation compared to theoretical need (3) determine the climatic and socioeconomic controls on landscape irrigation. We plan to compare results from agencies with uniform vs. allocation-based rate structures. A research partnership was established between six water retail agencies in Orange County: Huntington Beach Water District, El Toro Water District, Irvine Ranch Water District, East Orange County Water District, City of San Juan Capistrano, and Laguna Beach County Water District. These agencies represent a wide range of climatic and economic conditions and contributed between 3 and 13 years of SFR water use data on a monthly/bimonthly basis. Household water use, climate, and socioeconomic factors were mapped using Arcview GIS. Air temperature (California Irrigation Management Information System), precipitation (Orange County Cooperative Observer System), landscape size, and income (US Census) were evaluated as possible controls on SFR water use. Findings indicate that landscape water use may constitute the majority of household water use. We found over-irrigation relative to plant water demand in areas of Orange County. Domestic landscape water use may depend on climate and/or income. Results suggest a high potential for residential water savings with improved landscape irrigation efficiency. This information would be useful for improving or developing water use efficiency

  5. Graphite deposits in Siskiyou County, California

    USGS Publications Warehouse

    Rynearson, Garn A.

    1945-01-01

    The graphite deposits examined are in sec. 7, T. 47 N., R. 11 W., Siskiyou County, Calif., on the summit of the Siskiyou Mts. between Elk Meadow and the northeast end of "mill 6220" (see map of the Seias quadrangle). Four claims, designated as the Black Jack Nos. 1, 2, 3, and 4 claims, and a five-acre mill site have been located by W. H. Gassaway, W. B. Stewart, and E. R. Stewart. Development consists of four small cuts and several shallow trenches.

  6. Courtright intrusive zone: Sierra National Forest, Fresno County, California.

    USGS Publications Warehouse

    Bateman, P.C.; Kistler, R.W.; DeGraff, J.V.

    1984-01-01

    This is a field guide to a well-exposed area of plutonic and metamorphic rocks in the Sierra National Forest, Fresno County, California. The plutonic rocks, of which three major bodies are recognized, besides aplite and pegmatite dykes, range 103 to approx 90 m.y. in age. Points emphasized include cataclastic features within the plutonic rocks, schlieren and mafic inclusions. (M.A. 83M/0035).-A.P.

  7. Combined climate- and prey-mediated range expansion of Humboldt squid (Dosidicus gigas), a large marine predator in the California Current System.

    PubMed

    Stewart, Julia S; Hazen, Elliott L; Bograd, Steven J; Byrnes, Jarrett E K; Foley, David G; Gilly, William F; Robison, Bruce H; Field, John C

    2014-06-01

    Climate-driven range shifts are ongoing in pelagic marine environments, and ecosystems must respond to combined effects of altered species distributions and environmental drivers. Hypoxic oxygen minimum zones (OMZs) in midwater environments are shoaling globally; this can affect distributions of species both geographically and vertically along with predator-prey dynamics. Humboldt (jumbo) squid (Dosidicus gigas) are highly migratory predators adapted to hypoxic conditions that may be deleterious to their competitors and predators. Consequently, OMZ shoaling may preferentially facilitate foraging opportunities for Humboldt squid. With two separate modeling approaches using unique, long-term data based on in situ observations of predator, prey, and environmental variables, our analyses suggest that Humboldt squid are indirectly affected by OMZ shoaling through effects on a primary food source, myctophid fishes. Our results suggest that this indirect linkage between hypoxia and foraging is an important driver of the ongoing range expansion of Humboldt squid in the northeastern Pacific Ocean. PMID:24443361

  8. De-confounding of Relations Between Land-Level and Sea-Level Change, Humboldt Bay, Northern California: Uncertain Predictions of Magnitude and Timing of Tectonic and Eustatic Processes

    NASA Astrophysics Data System (ADS)

    Gilkerson, W.; Leroy, T. H.; Patton, J. R.; Williams, T. B.

    2010-12-01

    Humboldt Bay in Northern California provides a unique opportunity to investigate the effects of relative sea level change on both native flora and maritime aquiculture as influenced by both tectonic and eustatic sea-level changes. This combination of superposed influences makes quantitatively predicting relative sea-level more uncertain and consumption of the results for public planning purposes exceedingly difficult. Public digestion for practical purposes is confounded by the fact that the uncertainty for eustatic sea-level changes is a magnitude issue while the uncertainty associated with the tectonic land level changes is both a magnitude and timing problem. Secondly, the public is less well informed regarding how crustal deformation contributes to relative sea-level change. We model the superposed effects of eustatic sea-level rise and tectonically driven land-level changes on the spatial distribution of habitats suitable to native eelgrass (Zostera marina) and oyster mariculture operations in Humboldt Bay. While these intertidal organisms were chosen primarily because they have vertically restricted spatial distributions that can be successfully modeled, the public awareness of their ecologic and economic importance is also well developed. We employ easy to understand graphics depicting conceptual ideas along with maps generated from the modeling results to develop locally relevant estimates of future sea level rise over the next 100 years, a time frame consistent with local planning. We bracket these estimates based on the range of possible vertical deformation changes. These graphic displays can be used as a starting point to propose local outcomes from global and regional relative sea-level changes with respect to changes in the distribution of suitable habitat for ecologically and economically valuable species. Currently the largest sources of uncertainty for changes in relative sea-level in the Humboldt Bay area are 1) the rate and magnitude of tectonic

  9. 78 FR 21582 - Revisions to the California State Implementation Plan, Butte County Air Quality Management...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-04-11

    ... AGENCY 40 CFR Part 52 Revisions to the California State Implementation Plan, Butte County Air Quality Management District and Sacramento Metropolitan Air Quality Management District AGENCY: Environmental... County Air Quality Management District (BCAQMD) and Sacramento Metropolitan Air Quality...

  10. Structural Controls of the MacFarlane Geothermal System, Humboldt County, Nevada: New Insights Based on Detailed Geologic Mapping, Shallow Temperature Surveys, and Magnetic Data

    NASA Astrophysics Data System (ADS)

    Kraushaar, Sabina M.

    Detailed geologic mapping, structural analysis, magnetic and two-meter temperature data, integrated with previous datasets, constrain the structural controls of the MacFarlane geothermal system. MacFarlane hot springs and the travertine fissure ridges lie within a relay ramp. The relay ramp is formed between two overlapping, north-northeast-striking, west-dipping Holocene normal faults exposed in Lake Lahontan sediments. Other mapped faults near the hot spring include a north-striking, west-dipping Tertiary fault east of MacFarlane hot springs. The highest temperature gradient is found at the projected intersection between the Tertiary and north-northeast-striking Quaternary fault, ˜2.5 km northeast of the hot spring (Sibbett et al., 1982; Swanberg and Bowers, 1982). Our new data suggest other controls involving the relay ramp geometry of the Holocene faults. The anomalous orientation of the travertine fissure ridge motivated this study of the structural controls of the geothermal system. MacFarlane hot spring is located on the eastern margin of the Black Rock Desert, ˜85 km west of Winnemucca, in Humboldt County, Nevada. The active hot spring emerges from the west end of an east-trending travertine fissure ridge, which is ˜180 m long. The travertine fissure ridge is up to ˜2 m tall and ˜5 m wide, and has a central fissure along its long axis. The orientation of the travertine fissure ridge indicates local north-south extension, which is inconsistent with the regional west-northwest extension of the northwestern Basin and Range province. The anomalous travertine orientation is due to fractures that occurred during formation of a relay ramp between two overlapping fault segments.

  11. 76 FR 30025 - Revisions to the California State Implementation Plan, Placer County Air Pollution Control...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-05-24

    ... AGENCY 40 CFR Part 52 Revisions to the California State Implementation Plan, Placer County Air Pollution Control District and Ventura County Air Pollution Control District AGENCY: Environmental Protection Agency... the Placer County Air Pollution Control District (PCAPCD) and Ventura County Air Pollution...

  12. Ground-water altitudes and well data, Nye County, Nevada, and Inyo County, California

    SciTech Connect

    Ciesnik, M.S.

    1995-05-01

    This report contains ground-water altitudes and well data for wells located in Nye County, Nevada, and Inyo County, California, south of Yucca Mountain, Nevada, the potential site for a high-level nuclear waste repository. Data are from wells whose coordinates are within the Beatty and Death Valley Junction, California-Nevada maps from the US Geological Survey, scale 1:100,000 (30-minute {times} 60-minute quadrangle). Compilation of these data was made to provide a reference for numerical models of ground-water flow at Yucca Mountain and its vicinity. Water-level measurements were obtained from the US Geological Survey National Water Information System (NWIS) data base, and span the period of October 1951 to May 1991; most measurements were made from 1980 to 1990.

  13. Data on Streamflow and Quality of Water and Bottom Sediment in and near Humboldt Wildlife Management Area, Churchill and Pershing Counties, Nevada, 1998-2000

    USGS Publications Warehouse

    Paul, Angela P.; Thodal, Carl E.

    2003-01-01

    This study was initiated to expand upon previous findings that indicated concentrations of dissolved solids, arsenic, boron, mercury, molybdenum, selenium, and uranium were either above geochemical background concentrations or were approaching or exceeding ecological criteria in the lower Humboldt River system. Data were collected from May 1998 to September 2000 to further characterize streamflow and surface-water and bottom-sediment quality in the lower Humboldt River, selected agricultural drains, Upper Humboldt Lake, and Lower Humboldt Drain (ephemeral outflow from Humboldt Sink). During this study, flow in the lower Humboldt River was either at or above average. Flows in Army and Toulon Drains generally were higher than reported in previous investigations. An unnamed agricultural drain contributed a small amount to the flow measured in Army Drain. In general, measured concentrations of sodium, chloride, dissolved solids, arsenic, boron, molybdenum, and uranium were higher in water from agricultural drains than in Humboldt River water during this study. Mercury concentrations in water samples collected during the study period typically were below the laboratory reporting level. However, low-level mercury analyses showed that samples collected in August 1999 from Army Drain had higher mercury concentrations than those collected from the river or Toulon Drain or the Lower Humboldt Drain. Ecological criteria and effect concentrations for sodium, chloride, dissolved solids, arsenic, boron, mercury, and molybdenum were exceeded in some water samples collected as part of this study. Although water samples from the agricultural drains typically contained higher concentrations of sodium, chloride, dissolved solids, arsenic, boron, and uranium, greater instantaneous loads of these constituents were carried in the river near Lovelock than in agricultural drains during periods of high flow or non-irrigation. During this study, the high flows in the lower Humboldt River

  14. Anza-Terwilliger study wells in Riverside County, California

    USGS Publications Warehouse

    Morita, Andrew; Clark, Dennis A.; Martin, Peter

    2007-01-01

    This digital data set contains the locations, water-level altitude, and water-level differences of 70 wells selected to document water-level changes between fall 2004 and spring 2005 in the Anza-Terwilliger area of Riverside County, California. The winter of 2005 was one of the wettest periods on record. Links to the U.S. Geological Survey National Water Information Systems Website (NWISWeb) have been established to interactively view recent water-level information via the internet by clicking on a specific well.

  15. Stable isotope tracers: natural and anthropogenic recharge, Orange County, California

    NASA Astrophysics Data System (ADS)

    Williams, Alan E.

    1997-12-01

    Stable isotopic techniques have been utilized to locate occurrences and trace movements of a variety of naturally and anthropogenically recharged waters in aquifers of Orange County, California. This basin is of particular interest not only because it provides the dominant water supply for the two million residents of this well-populated county, but also because it is representative of a common arid environment where natural recharge is dominated by distant, high-elevation precipitation transported by a major river. Such arid basins are particularly sensitive to climatic and anthropogenic disturbance of their recharge and their subsurface hydrology. In order to identify distinctive waters, oxygen and hydrogen stable isotope ratios from Orange County wells have been compared with a regional database including an array of surface water samples representative of watershed runoff. Four distinctive subsurface water types can be resolved. Waters of "local" rainfall and imported, "Colorado" River aqueduct origins are easily distinguished from dominant, "native" Santa Ana river compositions by use of hydrogen and oxygen stable isotope analysis. Recent human interference with Santa Ana river flow and recharge is also marginally resolvable by isotopic techniques. Distinguishable isotopic signatures of "recent" Santa Ana recharge appear to be due to evaporative loss, perhaps during storage in the Prado Reservoir or in percolation ponds, prior to recharge into Orange County aquifers. Characterization of traceable isotopic signatures of distinct natural and anthropogenic recharge components provides a major advance towards use of such techniques for developing a well constrained, three-dimensional hydrologic model for this complex basin.

  16. Climate controls on valley fever incidence in Kern County, California

    NASA Astrophysics Data System (ADS)

    Zender, Charles S.; Talamantes, Jorge

    2006-01-01

    Coccidiodomycosis (valley fever) is a systemic infection caused by inhalation of airborne spores from Coccidioides immitis, a soil-dwelling fungus found in the southwestern United States, parts of Mexico, and Central and South America. Dust storms help disperse C. immitis so risk factors for valley fever include conditions favorable for fungal growth (moist, warm soil) and for aeolian soil erosion (dry soil and strong winds). Here, we analyze and inter-compare the seasonal and inter-annual behavior of valley fever incidence and climate risk factors for the period 1980-2002 in Kern County, California, the US county with highest reported incidence. We find weak but statistically significant links between disease incidence and antecedent climate conditions. Precipitation anomalies 8 and 20 months antecedent explain only up to 4% of monthly variability in subsequent valley fever incidence during the 23 year period tested. This is consistent with previous studies suggesting that C. immitis tolerates hot, dry periods better than competing soil organisms and, as a result, thrives during wet periods following droughts. Furthermore, the relatively small correlation with climate suggests that the causes of valley fever in Kern County could be largely anthropogenic. Seasonal climate predictors of valley fever in Kern County are similar to, but much weaker than, those in Arizona, where previous studies find precipitation explains up to 75% of incidence. Causes for this discrepancy are not yet understood. Higher resolution temporal and spatial monitoring of soil conditions could improve our understanding of climatic antecedents of severe epidemics.

  17. Mineral resources and land use in Stanislaus County, California

    SciTech Connect

    Higgins, C.T.; Dupras, D.L.; Chapman, R.H.; Churchill, R.K. . Div. of Mines and Geology)

    1993-04-01

    Stanislaus County covers portions of 3 geologic provinces: Coast Ranges, Great Valley, and Sierra Nevada. Each has been exploited for a distinct set of mineral resources, which include sand and gravel, ball and fire clay, placer gold, manganese, chromite, magnesite, mercury, diatomite, building stone, and mineral pigment. Of these, sand and gravel, clay, and diatomite have been the most important commodities produced recently. Sand and gravel, particularly that along the Tuolumne River, is and will continue to be the county's main mineral product; other potentially important areas include alluvial fans along the west side of the Great Valley. Clay and diatomite could resume importance in the future. There is also potential for quartz-rich specialty sands. Although the county is largely rural, it is undergoing one of the highest growth rates in California. Several new residential communities are being proposed in the county, which would have two major effects on mineral resources: (1) large sources of aggregate will be required for construction, and (2) development of residential areas may preclude mining of resources in those areas. Maps of mineral resources produced by this study, will assist decisions on such potential conflicts in land use.

  18. Development of An Integrated Hydrologic Model in Yolo County, California

    NASA Astrophysics Data System (ADS)

    Liang, Y.; Taghavi, A.; Stevenson, M.; Najmus, S.

    2006-12-01

    To more efficiently use the Cache Creek flows and the groundwater basin as the sources of water supply and to restore the riparian ecosystem along the Cache Creek, Yolo County Flood Control and Water Conservation District (YCFCWCD) in Woodland, California plans to conduct the Cache Creek Groundwater Recharge and Recovery Program (CCGRRP). The concept of this program is to operate the groundwater basin to induce greater amounts of groundwater recharge from Cache Creek directly along the creek and to increase the recharge even further by diverting rainy season water at the District's Capay Diversion Dam into the West Adams Canal to a few recharge basins outside the active channel of Cache Creek. Besides the CCGRRP, cities of Woodland and Davis are in the process of conducting groundwater management plans, and the stakeholders in Yolo County developing a long-term integrated regional water management plan (IRWMP) for the entire county. To effectively evaluate the benefits and impacts of CCGRRP, local groundwater management plans, and the Yolo County IRWMP, the Integrated Groundwater and Surface water Model (IGSM) was applied to the Yolo groundwater basin. The IGSM is a comprehensive integrated hydrologic model that simulates both surface water and groundwater flow systems, including rainfall-runoff, soil moisture accounting and unsaturated flow, crop consumptive module, stream-aquifer interaction, and groundwater flow. The finite element code was originally developed in 1990 for the California Department of Water Resources and the State Water Resources Control Board. The IGSM code has subsequently been applied to more than 25 groundwater basins in California and other states. The model code has been peer reviewed and upgraded throughout its application to various projects, with the latest upgrade in 2004, as part of the application to the Stony Creek Fan area of Sacramento Valley. The Yolo County IGSM (YCIGSM) was calibrated against the historical (1970

  19. Reconnaissance investigation of water quality, bottom sediment, and biota associated with irrigation drainage in and near Humboldt Wildlife Management Area, Churchill and Pershing Counties, Nevada, 1990-91

    USGS Publications Warehouse

    Seiler, R.L.; Ekechukwu, G.A.; Hallock, R.J.

    1993-01-01

    A reconnaissance investigation was begun in 1990 to determine whether the quality of irrigation drainage in and near the Humboldt Wildlife Management Area, Nevada, has caused or has the potential to cause harmful effects on human health, fish, and wildlife or to impair beneficial uses of water. Samples of surface and ground water, bottom sediment, and biota collected from sites upstream and downstream from the Lovelock agricultural area were analyzed for potentially toxic trace elements. Also analyzed were radioactive substances, major dissolved constitu- ents, and nutrients in water, as well as pesticide residues in bottom sediment and biota. In samples from areas affected by irrigation drainage, the following constituents equaled or exceeded baseline concentrations or recommended standards for protection of aquatic life or propagation of wildlife--in water: arsenic, boron, dissolved solids, mercury, molybdenum, selenium, sodium, and un-ionized ammonia; in bottom sediment; arsenic and uranium; and in biota; arsenic, boron, and selenium. Selenium appears to be biomagnified in the Humboldt Sink wetlands. Biological effects observed during the reconnaissance included reduced insect diversity in sites receiving irrigation drainage and acute toxicity of drain water and sediment to test organisms. The current drought and upstream consumption of water for irrigation have reduced water deliveries to the wetlands and caused habitat degradation at Humboldt Wildlife Management Area. During this investigation. Humboldt and Toulon Lakes evaporated to dryness because of the reduced water deliveries.

  20. California County Data Book 1997 [and] Report Card 1997. Challenges Ahead: Can Counties Make the Grade? A Children Now Report.

    ERIC Educational Resources Information Center

    Pine, Amy

    This Kids Count data book and report card examines statewide and county level trends in the well-being of California's children, with an additional focus on indicators of the new economic realities encountered by families as counties take on greater responsibility for local welfare programs. The statistical portrait is based on indicators in the…

  1. 78 FR 43827 - Irish Potatoes Grown in Modoc and Siskiyou Counties, California, and in All Counties in Oregon...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-07-22

    ..., reporting, and assessment collection regulations effective July 1, 1999 (64 FR 49352). The suspended...; ] DEPARTMENT OF AGRICULTURE Agricultural Marketing Service 7 CFR Part 947 Irish Potatoes Grown in Modoc and... handling of Irish potatoes grown in Modoc and Siskiyou Counties, California, and in all counties in...

  2. Service Integration in San Mateo County, California: Multiple Strategies with a Single Goal.

    ERIC Educational Resources Information Center

    Ragan, Mark

    Over the past decade, the Human Services Agency (HSA) of San Mateo County, California, has implemented a series of management and staff processes designed to facilitate the delivery of services to county residents. Examples of these services are as follows: (1) regionalization (HSA offices are located throughout the county, and office staff and…

  3. 76 FR 30080 - Revisions to the California State Implementation Plan, Placer County Air Pollution Control...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-05-24

    ... AGENCY 40 CFR Part 52 Revisions to the California State Implementation Plan, Placer County Air Pollution Control District and Ventura County Air Pollution Control District AGENCY: Environmental Protection Agency... Pollution Control District (PCAPCD) and Ventura County Air Pollution Control District (VCAPCD) portion...

  4. Ground-water resources in Mendocino County, California

    USGS Publications Warehouse

    Farrar, C.D.

    1986-01-01

    Mendocino County includes about 3,500 sq mi of coastal northern California. Groundwater is the main source for municipal and individual domestic water systems and contributes significantly to irrigation. Consolidated rocks of the Franciscan Complex are exposed over most of the county. The consolidated rocks are commonly dry and generally supply < 5 gal/min of water to wells. Unconsolidated fill in the inland valleys consists of gravel, sand, silt, and clay. Low permeability in the fill caused by fine grain size and poor sorting limits well yields to less than 50 gal/min in most areas; where the fill is better sorted, yields of 1,000 gal/min can be obtained. Storage capacity estimates for the three largest basins are Ukiah Valley, 90,000 acre-ft; Little lake Valley, 35,000 acre-ft; and Laytonville Valley, 14,000 acre-ft. Abundant rainfall (35 to 56 in/yr) generally recharges these basins to capacity. Seasonal water level fluctuations since the 1950 's have been nearly constant, except during the 1976-77 drought. Chemical quality of water in basement rocks and valley fill is generally acceptable for most uses. Some areas along fault zones yield water with high boron concentrations ( <2 mg/L). Sodium chloride water with dissolved solids concentrations exceeding 1,000 mg/L is found in deeper parts of Little Lake Valley. (Author 's abstract)

  5. Residential Mobility and Breast Cancer in Marin County, California, USA

    PubMed Central

    Jacquez, Geoffrey M.; Barlow, Janice; Rommel, Robert; Kaufmann, Andy; Rienti, Michael; AvRuskin, Gillian; Rasul, Jawaid

    2013-01-01

    Marin County (California, USA) has among the highest incidences of breast cancer in the U.S. A previously conducted case-control study found eight significant risk factors in participants enrolled from 1997–1999. These included being premenopausal, never using birth control pills, lower highest lifetime body mass index, having four or more mammograms from 1990–1994, beginning drinking alcohol after age 21, drinking an average two or more alcoholic drinks per day, being in the highest quartile of pack-years of cigarette smoking, and being raised in an organized religion. Previously conducted surveys provided residential histories; while Ǫ statistic accounted for participants’ residential mobility, and assessed clustering of breast cancer cases relative to controls based on the known risk factors. These identified specific cases, places, and times of excess breast cancer risk. Analysis found significant global clustering of cases localized to specific residential histories and times. Much of the observed clustering occurred among participants who immigrated to Marin County. However, persistent case-clustering of greater than fifteen years duration was also detected. Significant case-clustering among long-term residents may indicate geographically localized risk factors not accounted for in the study design, as well as uncertainty and incompleteness in the acquired addresses. Other plausible explanations include environmental risk factors and cases tending to settle in specific areas. A biologically plausible exposure or risk factor has yet to be identified. PMID:24366047

  6. Statistical modeling of valley fever data in Kern County, California

    NASA Astrophysics Data System (ADS)

    Talamantes, Jorge; Behseta, Sam; Zender, Charles S.

    2007-03-01

    Coccidioidomycosis (valley fever) is a fungal infection found in the southwestern US, northern Mexico, and some places in Central and South America. The fungus that causes it ( Coccidioides immitis) is normally soil-dwelling but, if disturbed, becomes air-borne and infects the host when its spores are inhaled. It is thus natural to surmise that weather conditions that foster the growth and dispersal of the fungus must have an effect on the number of cases in the endemic areas. We present here an attempt at the modeling of valley fever incidence in Kern County, California, by the implementation of a generalized auto regressive moving average (GARMA) model. We show that the number of valley fever cases can be predicted mainly by considering only the previous history of incidence rates in the county. The inclusion of weather-related time sequences improves the model only to a relatively minor extent. This suggests that fluctuations of incidence rates (about a seasonally varying background value) are related to biological and/or anthropogenic reasons, and not so much to weather anomalies.

  7. Statistical modeling of valley fever data in Kern County, California.

    PubMed

    Talamantes, Jorge; Behseta, Sam; Zender, Charles S

    2007-03-01

    Coccidioidomycosis (valley fever) is a fungal infection found in the southwestern US, northern Mexico, and some places in Central and South America. The fungus that causes it (Coccidioides immitis) is normally soil-dwelling but, if disturbed, becomes air-borne and infects the host when its spores are inhaled. It is thus natural to surmise that weather conditions that foster the growth and dispersal of the fungus must have an effect on the number of cases in the endemic areas. We present here an attempt at the modeling of valley fever incidence in Kern County, California, by the implementation of a generalized auto regressive moving average (GARMA) model. We show that the number of valley fever cases can be predicted mainly by considering only the previous history of incidence rates in the county. The inclusion of weather-related time sequences improves the model only to a relatively minor extent. This suggests that fluctuations of incidence rates (about a seasonally varying background value) are related to biological and/or anthropogenic reasons, and not so much to weather anomalies. PMID:17120065

  8. Residential mobility and breast cancer in Marin County, California, USA.

    PubMed

    Jacquez, Geoffrey M; Barlow, Janice; Rommel, Robert; Kaufmann, Andy; Rienti, Michael; AvRuskin, Gillian; Rasul, Jawaid

    2014-01-01

    Marin County (California, USA) has among the highest incidences of breast cancer in the U.S. A previously conducted case-control study found eight significant risk factors in participants enrolled from 1997-1999. These included being premenopausal, never using birth control pills, lower highest lifetime body mass index, having four or more mammograms from 1990-1994, beginning drinking alcohol after age 21, drinking an average two or more alcoholic drinks per day, being in the highest quartile of pack-years of cigarette smoking, and being raised in an organized religion. Previously conducted surveys provided residential histories; while statistic accounted for participants' residential mobility, and assessed clustering of breast cancer cases relative to controls based on the known risk factors. These identified specific cases, places, and times of excess breast cancer risk. Analysis found significant global clustering of cases localized to specific residential histories and times. Much of the observed clustering occurred among participants who immigrated to Marin County. However, persistent case-clustering of greater than fifteen years duration was also detected. Significant case-clustering among long-term residents may indicate geographically localized risk factors not accounted for in the study design, as well as uncertainty and incompleteness in the acquired addresses. Other plausible explanations include environmental risk factors and cases tending to settle in specific areas. A biologically plausible exposure or risk factor has yet to be identified. PMID:24366047

  9. Humboldt River main stem, Nevada

    USGS Publications Warehouse

    Warmath, Eric; Medina, Rose L.

    2001-01-01

    This data set contains the main stem of the Humboldt River as defined by Humboldt Project personnel of the U.S. Geological Survey Nevada District, 2001. The data set was digitized on screen using digital orthophoto quadrangles from 1994.

  10. Suspect Tsunami Deposits Point Reyes National Seashore Marin County California

    NASA Astrophysics Data System (ADS)

    Hoirup, D. F.

    2006-12-01

    An anomalous sand layer is inter-bedded within estuary mud deposits of Point Reyes National Seashore (PORE), Marin County, California. The alternating mud and sand deposits resemble tsunami deposited sediments located along northern California, Oregon, Washington and southern British Columbia (Cascadia) coastline, and other coastal locations around the world. This study was conducted to determine if the sedimentary record indicates a significant deviation from the typical low-energy long-duration depositional environment of the PORE marshes, to a brief high-energy short- duration depositional environment, then returning to typical quiet deposition. The sand layer appears continuous along a nearly 170 m sampling traverse of the upper-most reach of the Home Bay marsh and along a 55 m sampling traverse normal to the first traverse. Generally, the sand layer appears to drape the marsh, an area measuring at least 75 m by 300 m. This estimate is based on visual inspection of tidal channel banks where the sand layer is well exposed, approximately 25 cm below the marsh surface. The sand layer ranges from one to several centimeters thick and has an abrupt, smooth to wavy lower contact with the underlying estuary mud. The upper contact of the sand layer with the overlying mud ranges from gradual to abrupt and has a smooth subsurface topography. Several samples collected during the traverses appear as sand-mud couplets and are inversely graded. Should pending laboratory analysis support the anomalous sand layer as deposited by tsunami, we can then apply these data to extend the tsunami record and ultimately, improve assessment of tsunami risk.

  11. Evaluation of Cooperative Extension Efforts at the County Level: The University of California Example.

    ERIC Educational Resources Information Center

    Fiske, Emmett P.

    County-level data were gathered on California's agricultural-social conditions and the University of California's Cooperative Extension specializations, budgets, and manpower to measure the empirical relationship existing between the two. The agricultural and social data were treated as independent variables, while the Cooperative Extension…

  12. 76 FR 71922 - Revisions to the California State Implementation Plan, Placer County Air Pollution Control...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-11-21

    ... AGENCY 40 CFR Part 52 Revisions to the California State Implementation Plan, Placer County Air Pollution... County Air Pollution Control District (PCAPCD) and Sacramento Metropolitan Air Quality Management... following local rules: PCAPCD Rule 236 (Wood Products and Coating Operations), PCAPCD Rule 238...

  13. County Clustering for the California 4-H Youth Development Program: Impacts and Lessons Learned

    ERIC Educational Resources Information Center

    Subramaniam, Aarti; Dasher, Harry Steve; Young, Jane Chin

    2012-01-01

    In response to budgetary constraints, a new staffing structure, the Pilot Leadership Plan, was proposed for California's 4-H Youth Development Program. County clusters were formed, each led by a coordinator. The plan was piloted for 2 years to provide insight into how county clustering could support Extension staff to increase and enhance…

  14. 76 FR 54993 - Revisions to the California State Implementation Plan, Placer County Air Pollution Control District

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-09-06

    ... the Clean Air Act Amendments of 1990''; 57 FR ] 13498 (April 16, 1992); 57 FR 18070 (April 28, 1992... AGENCY 40 CFR Part 52 Revisions to the California State Implementation Plan, Placer County Air Pollution... proposing a limited approval and limited disapproval of ] revisions to the Placer County Air...

  15. 78 FR 53249 - Revisions to the California State Implementation Plan, Placer County Air Pollution Control District

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-08-29

    ... AGENCY 40 CFR Part 52 Revisions to the California State Implementation Plan, Placer County Air Pollution... finalizing approval of revisions to the Placer County Air Pollution Control District (PCAPCD) portion of the... Action On November 9, 2012 (77 FR 67322), EPA proposed to approve the following rule into the...

  16. 78 FR 6736 - Revisions to the California State Implementation Plan, Placer County Air Pollution Control District

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-01-31

    ... AGENCY 40 CFR Part 52 Revisions to the California State Implementation Plan, Placer County Air Pollution... taking direct final action to approve revisions to the Placer County Air Pollution Control District... earlier version of Rule 102 into the SIP on June 29, 1999 (64 FR 34558). PCAPCD adopted revisions to...

  17. 76 FR 75795 - Revisions to the California State Implementation Plan, Placer County Air Pollution Control District

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-12-05

    ... AGENCY 40 CFR Part 52 Revisions to the California State Implementation Plan, Placer County Air Pollution... taking direct final action to approve revisions to the Placer County Air Pollution Control District... earlier version of PCAPCD Rule 218 into the SIP on July 18, 1996 (61 FR 37390). The PCAPCD...

  18. 75 FR 1284 - Revisions to the California State Implementation Plan, Ventura County Air Pollution Control District

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-01-11

    ... AGENCY 40 CFR Part 52 Revisions to the California State Implementation Plan, Ventura County Air Pollution... finalizing approval of revisions to the Ventura County Air Pollution Control District (VCAPCD) portion of the.... Proposed Action On November 19, 2008 (73 FR 69593), EPA proposed to approve the following rules into...

  19. 78 FR 6784 - Revisions to the California State Implementation Plan, Placer County Air Pollution Control District

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-01-31

    ... AGENCY 40 CFR Part 52 Revisions to the California State Implementation Plan, Placer County Air Pollution... proposing to approve revisions to the Placer County Air Pollution Control District (PCAPCD) portion of the... approve local rules to regulate this emission source under the Clean Air Act (CAA or the Act). DATES:...

  20. 76 FR 75857 - Revisions to the California State Implementation Plan, Placer County Air Pollution Control District

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-12-05

    ... AGENCY 40 CFR Part 52 Revisions to the California State Implementation Plan, Placer County Air Pollution... proposing to approve revisions to the Placer County Air Pollution Control District (PCAPCD) portion of the... local rules to regulate these emission sources under the Clean Air Act as amended in 1990 (CAA or...

  1. 77 FR 2643 - Revisions to the California State Implementation Plan, Placer County Air Pollution Control District

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-01-19

    ... AGENCY 40 CFR Part 52 Revisions to the California State Implementation Plan, Placer County Air Pollution... finalizing a limited approval and limited disapproval of revisions to the Placer County Air Pollution Control... FR 54993), EPA proposed a limited approval and limited disapproval of the following rule that...

  2. 77 FR 67322 - Revisions to the California State Implementation Plan, Placer County Air Pollution Control District

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-11-09

    ... FR 2643). III. Statutory and Executive Order Reviews Under the Clean Air Act, the Administrator is... AGENCY 40 CFR Part 52 Revisions to the California State Implementation Plan, Placer County Air Pollution... proposing to approve revisions to the Placer County Air Pollution Control District (PCAPCD) portion of...

  3. 33 CFR 334.1127 - Naval Base Ventura County, Port Hueneme, California; restricted area.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 33 Navigation and Navigable Waters 3 2011-07-01 2011-07-01 false Naval Base Ventura County, Port....1127 Naval Base Ventura County, Port Hueneme, California; restricted area. (a) The area. The waters... area unless permission is obtained in advance from the Commanding Officer of Naval Base Ventura...

  4. 33 CFR 334.1127 - Naval Base Ventura County, Port Hueneme, California; restricted area.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Naval Base Ventura County, Port....1127 Naval Base Ventura County, Port Hueneme, California; restricted area. (a) The area. The waters... area unless permission is obtained in advance from the Commanding Officer of Naval Base Ventura...

  5. Silverthread oil field, Ventura County, California: a hydrodynamic trap

    SciTech Connect

    Hacker, R.N.; Hester, R.L.

    1987-05-01

    Silverthread oil field is located in west-central Ventura County, California. An unusual combination of Miocene turbidite sand deposition, tight folding, faulting, and hydrodynamics have created an accumulation of over 6 million bbl of oil from 33 wells. This field is also unique in that it lies beneath the convergence of several opposing major thrust faults which effectively hide any surface indication of structure at depth. Though previously and often explored by majors and other operators, the remarkable deduction and perseverance by Harry Browne and Argo Petroleum Corporation geologists led to the main area discovery in 1971. Of exceptional interest is the interaction of classic hydrodynamic flow on the distribution of fluids within the reservoir. Thirteen contour maps and numerous structure and stratigraphic sections were required to unravel the sand sequence, faulting, structure, and hydrodynamics. Because of high surface relief, most wells were directionally drilled from islands, and subsequent electric logs had to be unstretched using the Dental Dam technique to facilitate their correlation. A large, lighted, three-dimensional model consisting of thirty-six 2 x 5-ft transparent plexiglas plates was constructed to show a simple resolution of the complexities of this area and will be part of the poster session. This display, they believe, will generate considerable interest in their presentation.

  6. Water resources of the Descanso Area, San Diego County, California

    USGS Publications Warehouse

    Duell, L.F., Jr.

    1990-01-01

    Hydrologic information was collected during water year 1988 (October 1987 to September 1988) to evaluate the effects of current pumping on groundwater levels in the Descanso area in south-central San Diego County. Water year 1988 was a period of near-normal precipitation and runoff. The groundwater system in the area consists of aquifers in the metamorphic and granitic bedrock and in the overlying regolith (weathered bedrock). Most wells penetrate both aquifers, but the regolith is the source of most water pumped from wells. Groundwater storage in 1988 was estimated to be 800 to 2,000 acre-ft in the regolith and 300 to 3,000 acre-ft in bedrock. Recharge to the groundwater system from infiltration of precipitation and streamflow was estimated to be about 1,000 acre-ft. Pumpage, which was estimated to be 170 acre-ft, had little effect on groundwater storage. Water levels in wells were nearly the same at the end of the water year as at the beginning. Groundwater quality generally was suitable for domestic uses. Concentrations of iron and manganese , although nontoxic, exceeded California maximum contaminant levels for domestic drinking water in some wells. (USGS)

  7. Geologic map of southwestern Sequoia National Park, Tulare County, California

    USGS Publications Warehouse

    Sisson, Thomas W.; Moore, James G.

    2013-01-01

    This map shows the geology of 675 km2 (260 mi2) on the west slope of the Sierra Nevada, California, mainly in Sequoia National Park and Sequoia National Forest. It was produced by the U.S. Geological Survey (USGS) at the request of the National Park Service to complete the geologic map coverage of Kings Canyon and Sequoia National Parks. The area includes the Mineral King 15’ topographic quadrangle (sheet 1) and strips along the east and northeast edges of the Kaweah 15’ topographic quadrangle (sheet 2), both in Tulare County. Mapping was performed mainly on the 1:24,000-scale Mineral King, Silver City, Quinn Peak, Moses Mountain, Case Mountain, and Dennison Peak 7.5’ topographic quadrangle bases. Rocks within the study area are chiefly Cretaceous granites and granodiorites of the Sierra Nevada batholith that intruded coherent masses of Mesozoic metasedimentary and metavolcanic rocks. Quaternary till and talus are the principal surficial deposits, with the exception of a large bouldery alluvial apron near the southwest corner of the map area. The study area includes the headwaters of the Kaweah River (East and South Forks), Tule River (North Fork and North Fork of the Middle Fork), and the Little Kern River. Relief is considerable, with elevations spanning from 1,500 feet along the Middle Fork Kaweah River to 12,432 feet at the summit of Florence Peak along the crest of the Great Western Divide.

  8. Metasomatism, titanian acmite, and alkali amphiboles in lithic- wacke inclusions within the Coyote Peak diatreme, Humboldt County, California.

    USGS Publications Warehouse

    Czamanske, S.A.; Atkin, G.K.

    1985-01-01

    Lithic-wacke inclusions within the alkali-ultramafic diatreme at Coyote Peak record a history of pronounced metasomatism and crystal growth. The dominant metasomatic changes were loss of Si from the inclusions and mass influx of K, due to an unusually high K activity in the ultramafic host. The reaction with K converted much of the clay, quartz and lithic fraction of the lithic wacke into microcline, and exchanged Na from abundant clastic albite. Probe analyses are tabulated for cores and rims of titanian acmites, augites and alkali amphiboles. -J.A.Z.

  9. Geology and paleoenvironment of Bunker gas field, Solano County, California

    SciTech Connect

    Shariff, A.J.

    1986-04-01

    Bunker gas fields is in Solano County, T6N, R1, 2E, MDBM, in the Sacramento Valley, the northern part of the Great Valley of California. Correlation, interpretation, and analysis of electric logs from more than 60 wells were used in the study of the Bunker gas field. Subsurface structure contour maps of the field indicate a northwest-trending, faulted, domal to anticlinal fold that plunges to the southeast. Paleotopographic maps of the Bunker gas field demonstrate that: (1) the direction of the paleofluvial valleys and paleoslope during the late Cretaceous was generally in a south-southwesterly direction, and the sediment source was in the north-northeast; and (2) the direction of the paleofluvial valleys and paleoslope during the late Paleocene was generally to the west, and the sediment source was to the east of the field. This paleotopography is inferred to have persisted during the early Eocene. Electric-log analysis, lithologic characteristics (e.g., grain size, sorting), and stratigraphic sequence illustrate that subsurface deposystems in the Bunker gas field were predominantly shelf facies. Both progradational and retrogradational suites of strata occur within the stratigraphic sequence. a shallow regressive and transgressive sea was the prominent paleogeographic feature within the study area. During the Late Cretaceous, the study area was covered by a shallow regressive sea and was characterized by deltaic conditions during the period that the Mokelumne sand and shale lithosome was deposited. During the early late Paleocene, the study area was covered by a shallow transgressive sea, and a mid-neritic environment prevailed during the period that the McCormick sandstone was deposited. During the latest Paleocene, the area was covered by a shallow regressive sea and exhibited a littoral environment at the time when the Martinez shale was deposited.

  10. Assessment of ambient ozone air quality and evidence of transport effects in eastern Kern County, California

    SciTech Connect

    Beutelman, H.P.; Hallman, P.K.; Franz, J.A.

    1998-12-31

    Edwards AFB is located in the Mojave desert of southern California. The bulk of the base is located in the eastern part of Kern County, and is classified as serious non-attainment for ozone. However, geographically the eastern part of Kern County is separated form the western part of the county by some of the tallest mountains in the continental US. It has long been suspected, but not well quantified, that the air quality in eastern Kern County is impacted by transport of ozone from the San Joaquin area (as well as possible transport from the Los Angeles Basin area). Because of the significance of the ozone non-attainment designation with regards to the Department of Defense Base Realignment and Closure process, improved assessment of ambient ozone air quality and possible routes of transport in eastern Kern County was required. This was accomplished by; installing and operating an ambient air quality monitoring station at Edwards AFB; and comparing at least one year of data (ozone, NO{sub x} and meteorological) from the Edwards AFB station with similar data from the California Air Resources Board operated stations in the upwind locations (along possible transport routes) of Edison (western Kern County), Mojave (eastern Kern County) and Lancaster (northern Los Angeles County). Empirical analysis of this and other data indicate that; (1) compared to western Kern County, eastern Kern County is in a significantly different and isolated air basin; (2) the peak ambient ozone levels in eastern Kern County are substantially lower than in western Kern County; (3) peak ambient ozone levels in eastern Kern County occur late afternoon/early evening and are indicative of transport of ozone and (4) direct transport of ozone from the San Joaquin and/or South Coast area does occur (given proper conditions). This paper will address the elements of this study and its conclusions.

  11. A water-resources data network evaluation for Monterey County, California; Phase 1; South county

    USGS Publications Warehouse

    Showalter, P.K.; Hord, S.H.

    1986-01-01

    An evaluation made of rainfall, surface water, groundwater, and water quality monitoring networks in Salinas River basin in southern Monterey County, California, proposed all long-term rain gages be continued for extending short-term records and suggested the installation of two additional recording gages. Eight new storage rain gages were suggested at midaltitudes of east and west sides of Salinas Valley where few data are available. The evaluation revealed some short-term gaging stations could be discontinued because of good regression relations between them and the long-term stations Arroyo Seco near Soledad. Of 16 stations selected for the proposed network, 4 are new recording stations, 6 are new nonrecording streamflow and water quality sampling sites, 5 are existing stations, and the last is a station operated from 1969 to 1976; also included are water quality sampling stations on Lakes Nacimiento and San Antonio. The proposed groundwater network was developed from information on geology, geohydrology, and groundwater quality, high priority objectives for groundwater network, and consideration for providing good areal coverage of levels and water quality. Of 145 sites selected, 86 are existing monitoring wells. (USGS)

  12. County-level analysis of the impact of temperature and population increases on California wildfire data

    USGS Publications Warehouse

    Baltar, M.; Keeley, Jon E.; Schoenberg, F.P.

    2013-01-01

    The extent to which the apparent increase in wildfire incidence and burn area in California from 1990 to 2006 is affected by population and temperature increases is examined. Using generalized linear models with random effects, we focus on the estimated impacts of increases in mean daily temperatures and populations in different counties on wildfire in those counties, after essentially controlling for the overall differences between counties in their overall mean temperatures and populations. We find that temperature increase appears to have a significant positive impact on both total burn area and number of observed wildfires. Population growth appears to have a much less pronounced impact on total burn area than do annual temperature increases, and population growth appears to be negatively correlated with the total number of observed wildfires. These effects are especially pronounced in the winter season and in Southern California counties.

  13. History of Naturally Occurring Asbestos (NOA) Issues in California Beginning in El Dorado County in 1998

    NASA Astrophysics Data System (ADS)

    Beall, R.

    2012-12-01

    This presentation will provide a historical account when NOA emerged as a major issue in California beginning in El Dorado County (EDC) with front page news on March 29, 1998, resulting in public outcry and concern. What started in EDC resulted in major changes to rule making for all counties in California and stringent requirements for school projects. The overview includes a discussion of evolution of the rule making between 1998 and 2005 with EDC, CARB, DTSC, Department of Conservation, USGS, Cal OSHA, ATSDR, and EPA Superfund.

  14. 78 FR 24309 - California High-Speed Rail Authority-Construction Exemption-in Merced, Madera and Fresno Counties...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-04-24

    ... Surface Transportation Board California High-Speed Rail Authority--Construction Exemption--in Merced, Madera and Fresno Counties, Cal On March 27, 2013, California High-Speed Rail Authority (Authority), a... California High- Speed Rail Authority to know the reasons we reached this finding, but also to inform...

  15. Documentation of mountain lions in Marin County, California, 2010–2013

    USGS Publications Warehouse

    Fifield, Virginia L.; Rossi, Aviva J.; Boydston, Erin E.

    2015-01-01

    Prior to 2010, mountain lions (Puma concolor) have rarely been documented in Marin County, California. Although there are reports of sightings of mountain lions or observations of mountain lion sign, most have not been verified by photographs or physical samples. Beginning in 2010, we conducted a pilot study of mountain lions in Marin County using motion-triggered cameras. Our objectives were to obtain additional documentations, confirm the presence of mountain lions outside of Point Reyes National Seashore, and determine if mountain lions had a regular presence in the county

  16. Addressing the Social Determinants of Health through the Alameda County, California, Place Matters Policy Initiative

    PubMed Central

    Schaff, Katherine; Flournoy, Rebecca; Carson, Keith; Drenick, Teresa; Fujii, Darlene; Lee, Anna; Luginbuhl, Jessica; Mena, Mona; Shrago, Amy; Siegel, Anita; Stahl, Robert; Watkins-Tartt, Kimi; Willow, Pam; Witt, Sandra; Woloshin, Diane; Yamashita, Brenda

    2013-01-01

    In Alameda County, California, significant health inequities by race/ethnicity, income, and place persist. Many of the county's low-income residents and residents of color live in communities that have faced historical and current disinvestment through public policies. This disinvestment affects community conditions such as access to economic opportunities, well-maintained and affordable housing, high-quality schools, healthy food, safe parks, and clean water and air. These community conditions greatly affect health. At the invitation of the Joint Center for Political and Economic Studies' national Place Matters initiative, Alameda County Supervisor Keith Carson's Office and the Alameda County Public Health Department launched Alameda County Place Matters, an initiative that addresses community conditions through local policy change. We describe the initiative's creation, activities, policy successes, and best practices. PMID:24179279

  17. Addressing the social determinants of health through the Alameda County, California, place matters policy initiative.

    PubMed

    Schaff, Katherine; Desautels, Alexandra; Flournoy, Rebecca; Carson, Keith; Drenick, Teresa; Fujii, Darlene; Lee, Anna; Luginbuhl, Jessica; Mena, Mona; Shrago, Amy; Siegel, Anita; Stahl, Robert; Watkins-Tartt, Kimi; Willow, Pam; Witt, Sandra; Woloshin, Diane; Yamashita, Brenda

    2013-11-01

    In Alameda County, California, significant health inequities by race/ethnicity, income, and place persist. Many of the county's low-income residents and residents of color live in communities that have faced historical and current disinvestment through public policies. This disinvestment affects community conditions such as access to economic opportunities, well-maintained and affordable housing, high-quality schools, healthy food, safe parks, and clean water and air. These community conditions greatly affect health. At the invitation of the Joint Center for Political and Economic Studies' national Place Matters initiative, Alameda County Supervisor Keith Carson's Office and the Alameda County Public Health Department launched Alameda County Place Matters, an initiative that addresses community conditions through local policy change. We describe the initiative's creation, activities, policy successes, and best practices. PMID:24179279

  18. Geothermal direct-heat study: Imperial County, California

    SciTech Connect

    Not Available

    1983-05-01

    Potential applications of geothermal energy which would be compatible with the agricultural activities in the county were identified and a plan to attract potential users to the area was developed. The intent of the first effort was to identify general classifications of industries which could utilize geothermal heat in production processes. Two levels of analyses were utilized for this effort. Initially, activities relying on previously developed engineering and industrial concepts were investigated to determine capital costs, employment, and potential energy savings. Second, innovative concepts not yet fully developed were investigated to determine their potential applicability to the agricultural base of the county. These investigations indicated that the major potential applications of geothermal heat would involve industries related to food processing or other direct agriculture-related uses of raw materials produced or imported to the county. An implementation plan which can be utilized by the county to market direct heat applications was developed. A socioeconomics analysis examined the potential effects on the county from development of direct heat projects. The county's planning and permitting requirements for dirct heat projects were also examined.

  19. 78 FR 54147 - Domestic Dates Produced or Packed in Riverside County, California; Decreased Assessment Rate

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-09-03

    ... Marketing Service 7 CFR Part 987 Domestic Dates Produced or Packed in Riverside County, California; Decreased Assessment Rate AGENCY: Agricultural Marketing Service, USDA. ACTION: Interim rule with request... Regulatory Flexibility Act (RFA) (5 U.S.C. 601-612), the Agricultural Marketing Service (AMS) has...

  20. 75 FR 24544 - Revisions to the California State Implementation Plan, Placer County Air Pollution Control...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-05-05

    ...EPA is proposing to approve revisions to the Placer County Air Pollution Control District (PCAPCD), Sacramento Metropolitan Air Quality Management District (SMAQMD), San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD), and South Coast Air Quality Management District (SCAQMD) portions of the California State Implementation Plan (SIP). These revisions concern volatile organic......

  1. Spatially explicit West Nile virus risk modeling in Santa Clara County, California

    Technology Transfer Automated Retrieval System (TEKTRAN)

    A previously created Geographic Information Systems model designed to identify regions of West Nile virus (WNV) transmission risk is tested and calibrated in Santa Clara County, California. American Crows that died from WNV infection in 2005 provide the spatial and temporal ground truth. Model param...

  2. 75 FR 8008 - Revisions to the California State Implementation Plan, Imperial County Air Pollution Control...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-02-23

    ...EPA is proposing a limited approval and limited disapproval of revisions to the Imperial County Air Pollution Control District (ICAPCD) portion of the California State Implementation Plan (SIP). These revisions concern coarse particulate matter (PM10) emissions from sources of fugitive dust such as construction sites, unpaved roads, and disturbed soils in open and agricultural......

  3. FARM WORKERS IN A SPECIALIZED SEASONAL CROP AREA, STANISLAUS COUNTY, CALIFORNIA.

    ERIC Educational Resources Information Center

    METZLER, WILLIAM H.

    SPECIALIZATION IN THE CROPS BEST ADAPTED TO THE LOCAL AREA IS SEEN AS A HIGHLY PRODUCTIVE SYSTEM OF AGRICULTURE, BUT BY CREATING THE NEED FOR LARGE NUMBERS OF WORKERS FOR SHORT PERIODS OF TIME, IT CAUSES UNEMPLOYMENT AND MIGRATION. A SURVEY OF FRUIT AND VEGETABLE WORKERS IN STANISLAUS COUNTY, CALIFORNIA IN 1962-63 REVEALS--(1) THEIR EARNINGS ARE…

  4. 76 FR 26615 - Revisions to the California State Implementation Plan, Imperial County Air Pollution Control...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-05-09

    .... SUMMARY: EPA is finalizing approval of revisions to the Imperial County Air Pollution Control District... various air pollution sources. We are approving local rules that regulate these emission sources under the... February 9, 2011 (76 FR 7142), EPA proposed to approve the following rules into the California SIP....

  5. 75 FR 56942 - Revisions to the California State Implementation Plan, San Diego County Air Pollution Control...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-17

    ... AGENCY 40 CFR Part 52 Revisions to the California State Implementation Plan, San Diego County Air Pollution Control District AGENCY: Environmental Protection Agency (EPA). ACTION: Proposed rule. SUMMARY: EPA is proposing to approve revisions to the San Diego Air Pollution Control District...

  6. 78 FR 21540 - Revisions to the California State Implementation Plan, Butte County Air Quality Management...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-04-11

    ...EPA is taking direct final action to approve revisions to the Butte County Air Quality Management District (BCAQMD) and Sacramento Metropolitan Air Quality Management District (SMAQMD) portions of the California State Implementation Plan (SIP). These revisions concern volatile organic compound (VOC), oxides of nitrogen (NOX), and particulate matter (PM) emissions from residential......

  7. BOUNDS ON SUBSURFACE MERCURY FLUX FROM THE SULPHUR BANK MERCURY MINE, LAKE COUNTY, CALIFORNIA

    EPA Science Inventory

    The Sulphur Bank Mercury Mine (SBMM) in Lake County, California has been identified as a significant source of mercury to Clear Lake. The mine was operated from the 1860s through the 1950's. Mining started with surface operations, progressed to shaft mining, and later to open p...

  8. EVIDENCE FOR METAL ATTENUATION IN ACID MINE WATER BY SULFATE REDUCTION, PENN MINE, CALAVERAS COUNTY, CALIFORNIA

    EPA Science Inventory

    The Penn Mine in Calaveras County, California, produced Cu from massive sulfide ores from 1861 to 1953. Mine wastes were removed to a landfill during the late 1990s, improving surface-water quality, but deep mine workings were not remediated and contain metalliferous water with p...

  9. 75 FR 39581 - Yosemite Valley Plan; Yosemite National Park; Mariposa, Madera, and Tuolumne Counties, California...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-09

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF THE INTERIOR National Park Service Yosemite Valley Plan; Yosemite National Park; Mariposa, Madera, and Tuolumne Counties, California; Notice of Revised Record of Decision SUMMARY: On December 29, 2000, the National Park...

  10. Disparities in Health Insurance Coverage and Health Status Among Farmworkers, Sonoma County, California, 2013–2014

    PubMed Central

    Mercado, Jenny; Hill, Jana; Katz, Sarah C.

    2016-01-01

    Introduction The Sonoma County Farmworker Health Survey (FHS) was conducted to describe the health and well-being of adult farmworkers in Sonoma County, California, and to identify preventable health disparities for this population. Methods From September 2013 through January 2014, venue-based and convenience sampling were used to survey 293 farmworkers aged 18 years or older. The questions included self-rated general health, diabetes and hypertension, and body mass index. To identify disparities between surveyed farmworkers and Sonoma County residents overall, age-adjusted prevalence estimates were developed by using indirect standardization to the adult (≥18 years) Sonoma County sample from the California Health Interview Survey for 2011–2012. Results Surveyed farmworkers were mostly male (91%) and Latino or Hispanic (95%), and 54% had an educational attainment of 8th grade or less. Most (81%) farmworkers reported their families earned less than $30,000 in 2012. After adjusting for age, 30% of farmworkers had US-based health insurance as compared with the 86% of Sonoma County adults in 2011–2012 (P < .001), and 15% of farmworkers reported ever being diagnosed with diabetes after adjusting for age as compared with 5% of Sonoma County adults (P = .002). After adjusting for age, 44% of farmworkers reported poor or fair health in general as compared with 13% of Sonoma County adults (P < .001). Conclusion We identified significant health disparities between Sonoma County farmworkers and Sonoma County adults overall. Additional research and new health policies are necessary to eliminate these health disparities and to facilitate farmworker access to the health care system. PMID:27032988

  11. Sources of emergency water supplies in Santa Clara County, California

    USGS Publications Warehouse

    Akers, J.P.

    1977-01-01

    Water distribution systems in Santa Clara County, Calif., may be damaged and rendered inoperable by a large earthquake or other disaster. In such an event, individual agencies may have to implement emergency measures to supply water for drinking, firefighting, decontamination, or other purposes. In Santa Clara County, 128 wells have been identified as potential water-supply sources in emergencies. The criteria used to select the wells are: yield of at least 3 liters per second (50 gallons per minute), good water quality, ready accessibility, and available emergency power. Purification methods of small water supplies are described. (Woodard-USGS)

  12. Fire Prevention in California's Riverside County Headstart Project: An Evaluation.

    ERIC Educational Resources Information Center

    Folkman, William S.; Taylor, Jean

    Results of evaluation are reported for a safety program devised by Head Start teachers and California Division of Forestry personnel to teach fire prevention education to Head Start children. Chapters describe the place of fire prevention in Head Start and causes of fire starting behavior in children. The Head Start Fire Prevention Kit is also…

  13. Redwood National Park studies; data release number 2, Redwood Creek, Humboldt County, and Mill Creek, Del Norte County, California, April 11, 1974-September 30, 1975

    USGS Publications Warehouse

    Iwatsubo, Rick T.; Nolan, K.M.; Harden, D.R.; Glysson, G.D.

    1976-01-01

    An interdisciplinary study has been undertaken in Redwood National Park, Calif., to describe parts of the ecosystems and recent changes in the intensity of erosion and sedimentation, define processes that may alter the natural ecosystems, and assess the impact of recent road construction and timber harvest. This report is the second of a series that will present data collected in this study. Stream-discharge and water-quality data were collected at 53 sampling stations in the Redwood Creek and Mill Creek drainage basins. Measurements included the following variables: Stream stage and discharge; turbidity; sediment; onsite water-quality determinations of temperature, pH , total alkalinity, specific conductance, and dissolved-oxxygen concentration; chemical analyses of water samples for major dissolved solids, selected trace elements, nitrogen, phosphorus, and organic carbon; chemical analyses of bottom sediment for organic carbon and pesticides; bacteria; benthic invertebrates; fish; periphyton; phytoplankton; and seston. Additional data include changes in geometry at 10 stream-channel cross sections along Mill Creek and the distribution of erosional landforms in the Mill Creek drainage basin; quantity and chemical composition of rainwater; and the intragravel-streambed condition at selected stations in the Redwood Creek drainage basin. (Woodard-USGS)

  14. Beginnings of geothermal impact on county population and leadership, Imperial County, California

    SciTech Connect

    Pick, J.B.; Butler, E.W.

    1980-09-01

    A major geothermal energy development scenario is about to begin in Imperial County. Initial energy-socioeconomic interactions in the areas of population and county leadership structure are discussed. These include immigration of energy company workers, a sewage plant dispute, conflict over union affiliation of geothermal laborers, and a transmission corridor routing dispute.

  15. The Changing Epidemiology of Coccidioidomycosis in Los Angeles (LA) County, California, 1973-2011.

    PubMed

    Guevara, Ramon E; Motala, Tasneem; Terashita, Dawn

    2015-01-01

    Coccidioidomycosis, also known as Valley Fever, is often thought of as an endemic disease of central California exclusive of Los Angeles County. The fungus that causes Valley Fever, Coccidioides spp., grows in previously undisturbed soil of semi-arid and arid environments of certain areas of the Americas. LA County has a few large areas with such environments, particularly the Antelope Valley which has been having substantial land development. Coccidioidomycosis that is both clinically- and laboratory-confirmed is a mandated reportable disease in LA County. Population surveillance data for 1973-2011 reveals an annual rate increase from 0.87 to 3.2 cases per 100,000 population (n = 61 to 306 annual cases). In 2004, case frequency started substantially increasing with notable epidemiologic changes such as a rising 2.1 to 5.7 male-to-female case ratio stabilizing to 1.4-2.2. Additionally, new building construction in Antelope Valley greatly rose in 2003 and displayed a strong correlation (R = 0.92, Pearson p<0.0001) with overall LA County incidence rates for 1996-2007. Of the 24 LA County health districts, 19 had a 100%-1500% increase in cases when comparing 2000-2003 to 2008-2011. Case residents of endemic areas had stronger odds of local exposures, but cases from areas not known to be endemic had greater mortality (14% versus 9%) with notably more deaths during 2008-2011. Compared to the 57 other California counties during 2001-2011, LA County had the third highest average annual number of cases and Antelope Valley had a higher incidence rate than all but six counties. With the large number of reported coccidioidomycosis cases, multi-agency and community partnering is recommended to develop effective education and prevention strategies to protect residents and travelers. PMID:26313151

  16. The Changing Epidemiology of Coccidioidomycosis in Los Angeles (LA) County, California, 1973–2011

    PubMed Central

    2015-01-01

    Coccidioidomycosis, also known as Valley Fever, is often thought of as an endemic disease of central California exclusive of Los Angeles County. The fungus that causes Valley Fever, Coccidioides spp., grows in previously undisturbed soil of semi-arid and arid environments of certain areas of the Americas. LA County has a few large areas with such environments, particularly the Antelope Valley which has been having substantial land development. Coccidioidomycosis that is both clinically- and laboratory-confirmed is a mandated reportable disease in LA County. Population surveillance data for 1973–2011 reveals an annual rate increase from 0.87 to 3.2 cases per 100,000 population (n = 61 to 306 annual cases). In 2004, case frequency started substantially increasing with notable epidemiologic changes such as a rising 2.1 to 5.7 male-to-female case ratio stabilizing to 1.4–2.2. Additionally, new building construction in Antelope Valley greatly rose in 2003 and displayed a strong correlation (R = 0.92, Pearson p<0.0001) with overall LA County incidence rates for 1996–2007. Of the 24 LA County health districts, 19 had a 100%-1500% increase in cases when comparing 2000–2003 to 2008–2011. Case residents of endemic areas had stronger odds of local exposures, but cases from areas not known to be endemic had greater mortality (14% versus 9%) with notably more deaths during 2008–2011. Compared to the 57 other California counties during 2001–2011, LA County had the third highest average annual number of cases and Antelope Valley had a higher incidence rate than all but six counties. With the large number of reported coccidioidomycosis cases, multi-agency and community partnering is recommended to develop effective education and prevention strategies to protect residents and travelers. PMID:26313151

  17. Mineral resources of the North Algodones Dunes Wilderness Study Area (CDCA-360), Imperial County, California

    SciTech Connect

    Smith, R.S.U.; Yeend, W.; Dohrenwend, J.C.; Gese, D.D.

    1984-01-01

    This report presents the results of a mineral survey of the North Algodones Dunes Wilderness Study Area (CDCA-360), California Desert Conservation Area, Imperial County, California. The potential for undiscovered base and precious metals, and sand and gravel within the North Algodones Dunes Wilderness Study Area is low. The study area has a moderate potential for geothermal energy. One small sand-free area between the Coachella Canal and the west edge of the dune field would probably be the only feasible exploration site for geothermal energy. The study area has a moderate to high potential for the occurrence of undiscovered gas/condensate within the underlying rocks. 21 refs.

  18. Ambient Air Pollution and Autism in Los Angeles County, California

    PubMed Central

    Becerra, Tracy Ann; Wilhelm, Michelle; Olsen, Jørn; Cockburn, Myles

    2012-01-01

    Background: The prevalence of autistic disorder (AD), a serious developmental condition, has risen dramatically over the past two decades, but high-quality population-based research addressing etiology is limited. Objectives: We studied the influence of exposures to traffic-related air pollution during pregnancy on the development of autism using data from air monitoring stations and a land use regression (LUR) model to estimate exposures. Methods: Children of mothers who gave birth in Los Angeles, California, who were diagnosed with a primary AD diagnosis at 3–5 years of age during 1998–2009 were identified through the California Department of Developmental Services and linked to 1995–2006 California birth certificates. For 7,603 children with autism and 10 controls per case matched by sex, birth year, and minimum gestational age, birth addresses were mapped and linked to the nearest air monitoring station and a LUR model. We used conditional logistic regression, adjusting for maternal and perinatal characteristics including indicators of SES. Results: Per interquartile range (IQR) increase, we estimated a 12–15% relative increase in odds of autism for ozone [odds ratio (OR) = 1.12, 95% CI: 1.06, 1.19; per 11.54-ppb increase] and particulate matter ≤ 2.5 µm (OR = 1.15; 95% CI: 1.06, 1.24; per 4.68-μg/m3 increase) when mutually adjusting for both pollutants. Furthermore, we estimated 3–9% relative increases in odds per IQR increase for LUR-based nitric oxide and nitrogen dioxide exposure estimates. LUR-based associations were strongest for children of mothers with less than a high school education. Conclusion: Measured and estimated exposures from ambient pollutant monitors and LUR model suggest associations between autism and prenatal air pollution exposure, mostly related to traffic sources. PMID:23249813

  19. Reconnaissance of geothermal resources of Los Angeles County, California

    SciTech Connect

    Higgins, C.T.

    1981-01-01

    Thermal waters produced from large oil fields are currently the most important geothermal resources in Los Angeles County. Otherwise, the County does not appear to have any large, near-surface geothermal resources. The oil fields produce thermal water because of both the moderate depths of production and normal to above-normal geothermal gradients. Gradients are about 3.0-3.5/sup 0/C/100 meters in the Ventura Basin and range from that up to about 5.5-6.0/sup 0/C/100 meters in the Los Angeles Basin. The hottest fields in the County are west of the Newport-Inglewood Structural Zone. The Los Angeles Basin has substantially more potential for uses of heat from oil fields than does the Ventura Basin because of its large fields and dense urban development. Produced fluid temperatures there range from ambient air to boiling, but most are in the 100-150/sup 0/F range. Daily water production ranges from only a few barrels at some fields to over a million barrels at Wilmington Oil Field; nearly all fields produce less than 50,000 barrels/day. Water salinity generally ranges from about 15,000-35,000 mg/liter NaCl. Fields with the most promise as sources of heat for outside applications are Wilmington, Torrance, Venice Beach, and Lawndale. The centralized treatment facilities are the most favorable sites for extraction of heat within the oil fields. Because of the poor water quality heat exchangers will likely be required rather than direct circulation of the field water to users. The best sites for applications are commercial-industrial areas and possibly institutional structures occupied by large numbers of people.

  20. Sedimentation of Williams Reservoir, Santa Clara County, California

    USGS Publications Warehouse

    Ritter, John R.; Brown, William M., III

    1972-01-01

    Fifty-two acre-feet of sediment was ·deposited in Williams Reservoir between 1913 and 1971. From calculations of the sediment yields in other nearby drainage basins in Santa Clara County, it was determined that 24 to 38 acre-feet of sediment would have been transported to Williams Reservoir between 1961 and 1971 under natural conditions. The difference (14 to 28 acre-ft) is probably a consequence of increased sediment yield due to a fire that destroyed much of the vegetation in the drainage basin in 1961.

  1. Geology and nickel mineralization of the Julian-Cuyamaca area, San Diego County, California

    USGS Publications Warehouse

    Creasey, S.C.

    1946-01-01

    The Julian-Cuyamaca area is in the San Diego Mountains, one of the Peninsular Ranges of southern California. It lies in San Diego County, about 3 miles south of Julian, and approximately 60 miles northeast of San Diego. The area was mapped, and its nickel mineralization studied, from March to June, 1944; the work was part of the U. S. Geological Survey's program of strategic mineral investigations.

  2. Environmental assessmental, geothermal energy, Heber geothermal binary-cycle demonstration project: Imperial County, California

    SciTech Connect

    Not Available

    1980-10-01

    The proposed design, construction, and operation of a commercial-scale (45 MWe net) binary-cycle geothermal demonstration power plant are described using the liquid-dominated geothermal resource at Heber, Imperial County, California. The following are included in the environmental assessment: a description of the affected environment, potential environmental consequences of the proposed action, mitigation measures and monitoring plans, possible future developmental activities at the Heber anomaly, and regulations and permit requirements. (MHR)

  3. Evaluation of animal control measures on pet demographics in Santa Clara County, California, 1993–2006

    PubMed Central

    Johnson, Karen L.; Weng, Hsin-Yi

    2013-01-01

    The measurable benefits of animal control programs are unknown and the aim of this study was to determine the impact of these programs on pet population changes. A prospective cross-sectional study of 1000 households was implemented in 2005 to evaluate characteristics of the owned and unowned population of dogs and cats in Santa Clara County, California. The same population was previously studied 12 years earlier. During this time period, the county instituted in 1994 and then subsequently disestablished a municipal spay/neuter voucher program for cats. Dog intakes declined from 1992–2005, as they similarly did for an adjacent county (San Mateo). However, cat intakes declined significantly more in Santa Clara County than San Mateo, with an average annual decline of approximately 700 cats for the 12 year period. Time series analysis showed a greater than expected decline in the number of cats surrendered to shelters in Santa Clara County during the years the voucher program was in effect (1994–2005). The net savings to the county by reducing the number of cat shelter intakes was estimated at approximately $1.5 million. The measurable benefits of animal control programs are unknown and the aim of this study was to determine the impact of these programs on pet population changes. PMID:23638352

  4. Evaluation of animal control measures on pet demographics in Santa Clara County, California, 1993-2006.

    PubMed

    Kass, Philip H; Johnson, Karen L; Weng, Hsin-Yi

    2013-01-01

    The measurable benefits of animal control programs are unknown and the aim of this study was to determine the impact of these programs on pet population changes. A prospective cross-sectional study of 1000 households was implemented in 2005 to evaluate characteristics of the owned and unowned population of dogs and cats in Santa Clara County, California. The same population was previously studied 12 years earlier. During this time period, the county instituted in 1994 and then subsequently disestablished a municipal spay/neuter voucher program for cats. Dog intakes declined from 1992-2005, as they similarly did for an adjacent county (San Mateo). However, cat intakes declined significantly more in Santa Clara County than San Mateo, with an average annual decline of approximately 700 cats for the 12 year period. Time series analysis showed a greater than expected decline in the number of cats surrendered to shelters in Santa Clara County during the years the voucher program was in effect (1994-2005). The net savings to the county by reducing the number of cat shelter intakes was estimated at approximately $1.5 million. The measurable benefits of animal control programs are unknown and the aim of this study was to determine the impact of these programs on pet population changes. PMID:23638352

  5. Geohydrology and evapotranspiration at Franklin Lake Playa, Inyo County, California

    SciTech Connect

    1990-12-01

    Franklin Lake playa is one of the principal discharge areas of the Furnace Creek Ranch-Alkali Flat ground-water-flow system in southern Nevada and adjacent California. Yucca Mountain, Nevada, located within this flow system, is being evaluated by the US Department of Energy to determine its suitability as a potential site for a high-level nuclear-waste repository. To assist the US Department of Energy with its evaluation of the Yucca Mountain site, the US Geological Survey developed a parameter-estimation model of the Furnace Creek Ranch-Alkali Flat ground-water-flow system. Results from sensitivity analyses made using the parameter-estimation model indicated that simulated rates of evapotranspiration at Franklin Lake playa had the largest effect on the calculation of transmissivity values at Yucca Mountain of all the model-boundary conditions and, therefore, that evapotranspiration required careful definition. 72 refs., 59 figs., 26 tab.

  6. Magma energy exploratory well Long Valley caldera, Mono County, California

    SciTech Connect

    Bender-Lamb, S.

    1991-04-01

    Intensive study of Long Valley over the past 15 years indicates evidence for magma at depths accessible to drilling. The Department of Energy's Magma Energy Extraction Program is currently drilling a 20,000 foot exploratory well into the Long Valley caldera. The purpose of this program is to determine the feasibility of producing electrical power from magma. If the magma energy experiment is successful, the Long Valley caldera could hypothetically supply the electrical power needs of California for 100 years at present power consumption rates. The paper describes calderas, the potential of geothermal energy, Long Valley geology, the Long Valley magma energy exploratory well, the four phases of the exploratory well drilling program, and Phase 1 results.

  7. Geohydrology and evapotranspiration at Franklin Lake playa, Inyo County, California

    SciTech Connect

    Czarnecki, J.B.

    1997-12-31

    Franklin Lake playa is one of the principal discharge areas of the Furnace Creek Ranch-Alkali Flat ground-water-flow system in southern Nevada and adjacent California. Yucca Mountain, Nevada, located within this flow system, is being evaluated by the US Department of Energy to determine its suitability as a potential site for a high-level nuclear-waste repository. To assist the U.S. Department of Energy with its evaluation of the Yucca Mountain site, the US Geological Survey developed a parameter-estimation model of the Furnace Creek Ranch-Alkali Flat ground-water-flow system. Results from sensitivity analyses made using the parameter-estimation model indicated that simulated rates of evapotranspiration at Franklin Lake playa had the largest effect on the calculation of transmissivity values at Yucca Mountain of all the model-boundary conditions and, therefore, that evapotranspiration required careful definition.

  8. Two-garnet rodingite from Amador County, California

    USGS Publications Warehouse

    Duffield, W.A.; Beeson, M.H.

    1973-01-01

    Two distinct phases of garnet have been discovered in rodingite from Amador County, Calif. The two garnets are hydrogrossular and (hydro?) grossular-andradite. Only one, generally hydrogrossular, has been reported in rodingitcs studied by other workers. The rodingite of this study formed from a mafic dike with abundant euhedral plagioclase laths. The hydrogrossular is concentrated within the areas of these laths and is volumetrically about as abundant. The (hydro?) grossular-andradite is concentrated in the groundmass and as incursions into the plagioclase laths. The garnets apparently grew during one general episode of metasomatism, and their spatial distribution and compositions were controlled principally by the unequal distribution of iron and aluminum caused by the presence of plagioclase laths (and mafic minerals?) in the original unaltered dike.

  9. Sources of emergency water supplies in San Mateo County, California

    USGS Publications Warehouse

    Wood, P.R.

    1975-01-01

    San Mateo County has several densely populated urban areas that get most of their water supplies from surface-water sources that could by damaged by a major earthquake or other general disaster. In the event of such a disaster, limited supplies of potable water may be obtained from selected wells, springs, and perennial streams. This report outlines the principal sources of existing water supplies, gives information on the need for emergency water-supply procedures, presents general criteria needed for selecting emergency water-supply wells, summarizes information for 60 selected water wells, numerous springs, and perennial streams that can be used as sources of water, and describes emergency water-purification procedures that can be used by individuals or small groups of people.

  10. Space Radar Image of Orange County, California (annotated version)

    NASA Technical Reports Server (NTRS)

    1994-01-01

    This spaceborne radar image of Orange County, Calif., shows the massive urbanization of this rapidly growing region located just south of Los Angeles. Orange County, sandwiched between rugged mountains and the Pacific Ocean, includes the communities of Anaheim, Santa Ana and Huntington Beach. Anaheim Stadium can be seen in the upper center of the image, as a small white ring to the right of a major freeway intersection. The large dark blue rectangular area in the upper left is the Seal Beach Naval Weapons Station and adjacent wildlife refuge. Runways of the El Toro Marine Air Station appear as a black 'x' near the center of the image. The large purple area to the left of the the Air Station and extending to the coast is the scar left by the Laguna wildfire of October 1993. The sparse vegetation left in the wake of the fire provides a weak source of radar echoes, making the burn areas distinctively dark in the image. Another large burn area, from the Ortega fire of 1993, is seen in the mountains in the lower right of the image. The image was acquired by the Spaceborne Imaging Radar-C/X-band Synthetic Aperture Radar (SIR-C/X-SAR) onboard the space shuttle Endeavour on October 3, 1994. The image is centered at 33.7 degrees north latitude and 117.7 degrees west longitude. North is toward the upper right. The image shows an area 66.2 kilometers by 44.2 kilometers (41.0 miles by 27.4 miles). The colors are assigned todifferent frequencies and polarizations of the radar as follows: red is L-band, horizontally transmitted, horizontally received; green is L-band, horizontally transmitted, vertically received; blue is C-band, horizontally transmitted, vertically received. SIR-C/X-SAR, a joint mission of the German, Italian and United States space agencies, is part of NASA's Mission to Planet Earth program.

  11. Pliocene Invertebrates From the Travertine Point Outcrop of the Imperial Formation, Imperial County, California

    USGS Publications Warehouse

    Powell, Charles L.

    2008-01-01

    Forty-four invertebrate taxa, including one coral, 40 mollusks (30 bivalves and 10 gastropods), and three echinoids are recognized from a thin marine interval of the Imperial Formation near Travertine Point, Imperial County, California. The Travertine Point outcrop lies about midway between exposures of the Imperial Formation around Palm Springs, Riverside County, and exposures centered at Coyote Mountain in Imperial and San Diego Counties. Based on faunal comparisons, the Travertine Point outcrop corresponds to the Imperial and San Diego outcrops. The Travertine Point fauna is inferred to have lived in subtropical to tropical waters at littoral to inner sublittorial (<50 m) water depths. Coral and molluscan species from the Travertine Point outcrop indicate a Pliocene age. Two extant bivalve mollusks present have not previously been reported as fossils Anadara reinharti and forms questionably referred to Dosinia semiobliterata.

  12. Chemical analyses for selected wells in San Joaquin County and part of Contra Costa County, California

    USGS Publications Warehouse

    Keeter, Gail L.

    1980-01-01

    The study area of this report includes the eastern valley area of Contra Costa County and all of San Joaquin County, an area of approximately 1,600 square miles in the northern part of the San Joaquin Valley, Calif. Between December 1977 and December 1978, 1,489 wells were selectively canvassed. During May and June in 1978 and 1979, water samples were collected for chemical analysis from 321 of these wells. Field determinations of alkalinity, conductance, pH, and temperature were made, and individual constituents were analyzed. This report is the fourth in a series of baseline data reports on wells in the Sacramento and San Joaquin Valleys. (USGS)

  13. 33 CFR 165.1195 - Regulated Navigation Area; Humboldt Bay Bar Channel and Humboldt Bay Entrance Channel, Humboldt...

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... substances listed in 46 CFR 153.40. Humboldt Bay Area means the area described in the location section of... requirements listed in title 33 CFR, part 160, Ports and Waterways Safety—General, subpart C—Notifications of... Navigation Area (RNA) includes all navigable waters of the Humboldt Bay Bar Channel and the Humboldt...

  14. Rickettsia felis in cat fleas, Ctenocephalides felis parasitizing opossums, San Bernardino County, California.

    PubMed

    Abramowicz, K F; Wekesa, J W; Nwadike, C N; Zambrano, M L; Karpathy, S E; Cecil, D; Burns, J; Hu, R; Eremeeva, M E

    2012-12-01

    Los Angeles and Orange Counties are known endemic areas for murine typhus in California; however, no recent reports of flea-borne rickettsioses are known from adjacent San Bernardino County. Sixty-five opossums (Didelphis virginiana) were trapped in the suburban residential and industrial zones of the southwestern part of San Bernardino County in 2007. Sixty out of 65 opossums were infested with fleas, primarily cat fleas, Ctenocephalides felis (Bouché, 1835). The flea minimum infection rate with Rickettsia felis was 13.3% in pooled samples and the prevalence was 23.7% in single fleas, with two gltA genotypes detected. In spite of historic records of murine typhus in this area, no evidence for circulation of R. typhi in fleas was found during the present study. Factors contributing to the absence of R. typhi in these cat fleas in contrast to its presence in cat fleas from Orange and Los Angeles Counties are unknown and need to be investigated further in San Bernardino County. PMID:22712460

  15. California Child Care Workforce Study: Family Child Care Providers and Assistants in Alameda County, Kern County, Monterey County, San Benito County, San Francisco County, San Mateo County, Santa Cruz County, and Santa Clara County.

    ERIC Educational Resources Information Center

    Whitebook, Marcy; Almaraz, Mirella; Jo-Yung, Joon; Sakai, Laura; Boots, Shelley Waters; Voisin, Irene; Young, Marci; Burton, Alice; Duff, Brian; Laverty, Kassin; Bellm, Dan; Jay, E. Deborah; Krishnaswamy, Nandini; Kipnis, Fran

    An important first step toward more effectively addressing the complexities of child care as a service for families and as an employment setting for workers in California is to develop a detailed picture of the child care workforce. On this premise, a study examined licensed family child care provider demographics, professional preparation, length…

  16. Clay mineralogy of Pleistocene Lake Tecopa, Inyo County, California

    USGS Publications Warehouse

    Starkey, Harry C.; Blackmon, Paul D.

    1979-01-01

    Pleistocene Lake Tecopa in southeastern Inyo County, Calif., was formed when the Amargosa River was blocked at the southern end of its valley. The lake acted as a settling basin for detrital material being transported by the river. This detritus consisted of clays, quartz, feldspars, and micas which became mudstones and siltstones. These mudstones and siltstones, much eroded and dissected after the draining of the lake, extend over the entire basin and are interbedded with tuffs formed by the intermittent deposition of volcanic ashfalls in the former lake waters. These lightcolored mudstones and siltstones are tough and well indurated and break with a conchoidal fracture. The predominant clay mineral in these detrital beds is a lithiumbearing saponite, which is found not only in the lake beds but also in the area beyond the boundaries of the lake, especially in fluvial deposits in the drainage basin of the Amargosa River to the north. This saponite does not contain enough lithium to be classified as a hectorite, and we have observed no indications that this clay consists of a mixture of two phases, such as hectorite and a diluent. Some authigenic dioctahedral montmorillonite, found only in small quantities close to the tuffs, was formed by alteration of the volcanic glass of the tuffs and was then admixed with the overlying or underlying detrital clays. The only authigenic clay-type mineral found in any significant quantity is sepiolite, found near the edges of the lake basin and stratigraphically located mainly within a meter of the two uppermost tuffs. This sepiolite probably was precipitated when silica became available to the magnesium-bearing lake water through dissolution of the volcanic ash. Precipitation of sepiolite probably did not occur within the tuffs owing to the presence of alumina in solution. Zeolites were produced there and sepiolite formed outside the margins of the tuffs. Also formed by the high-pH lake waters were water-soluble minerals, which

  17. Hospital Utilization for Injection Drug Use-Related Soft Tissue Infections in Urban versus Rural Counties in California

    PubMed Central

    Etzioni, David A.; Hurley, Brian; Holtom, Paul; Bluthenthal, Ricky N.; Asch, Steven M.

    2006-01-01

    Drug related-soft tissue infections (DR-STIs) are a significant source of hospital utilization in inner-city urban areas where injection drug use is common but the magnitude of hospital utilization for DR-STIs outside of inner-city urban areas is not known. We described the magnitude and characteristics of hospital utilization for DR-STIs in urban versus rural counties in California. All discharges from all nonfederal hospitals in California in 2000 with ICD-9 codes for a soft tissue infection and for drug dependence/abuse were abstracted from the California Office of Statewide Health Planning and Development discharge database. There were 4,152 DR-STI discharges in 2000 from hospitals in 49 of California's 58 counties. Residents of 12 large metropolitan counties accounted for 3,598 discharges (87% of total). The majority of DR-STI discharges were from urban safety net hospitals with county indigent programs and Medicaid as the expected payment source and opiate related discharge diagnoses. Hospital utilization for DR-STIs in California is highest in large urban metropolitan counties, although DR-STI discharges are widespread. Increased access to harm reduction services and drug treatment may reduce government health care expenditures by preventing unnecessary hospital utilization for DR-STIs. PMID:16736367

  18. Digital Geologic Map of the Nevada Test Site and Vicinity, Nye, Lincoln, and Clark Counties, Nevada, and Inyo County, California

    USGS Publications Warehouse

    Slate, Janet L.; Berry, Margaret E.; Rowley, Peter D.; Fridrich, Christopher J.; Morgan, Karen S.; Workman, Jeremiah B.; Young, Owen D.; Dixon, Gary L.; Williams, Van S.; McKee, Edwin H.; Ponce, David A.; Hildenbrand, Thomas G.; Swadley, W.C.; Lundstrom, Scott C.; Ekren, E. Bartlett; Warren, Richard G.; Cole, James C.; Fleck, Robert J.; Lanphere, Marvin A.; Sawyer, David A.; Minor, Scott A.; Grunwald, Daniel J.; Laczniak, Randell J.; Menges, Christopher M.; Yount, James C.; Jayko, Angela S.

    1999-01-01

    This digital geologic map of the Nevada Test Site (NTS) and vicinity, as well as its accompanying digital geophysical maps, are compiled at 1:100,000 scale. The map compilation presents new polygon (geologic map unit contacts), line (fault, fold axis, metamorphic isograd, dike, and caldera wall) and point (structural attitude) vector data for the NTS and vicinity, Nye, Lincoln, and Clark Counties, Nevada, and Inyo County, California. The map area covers two 30 x 60-minute quadrangles-the Pahute Mesa quadrangle to the north and the Beatty quadrangle to the south-plus a strip of 7.5-minute quadrangles on the east side-72 quadrangles in all. In addition to the NTS, the map area includes the rest of the southwest Nevada volcanic field, part of the Walker Lane, most of the Amargosa Desert, part of the Funeral and Grapevine Mountains, some of Death Valley, and the northern Spring Mountains. This geologic map improves on previous geologic mapping of the same area (Wahl and others, 1997) by providing new and updated Quaternary and bedrock geology, new geophysical interpretations of faults beneath the basins, and improved GIS coverages. Concurrent publications to this one include a new isostatic gravity map (Ponce and others, 1999) and a new aeromagnetic map (Ponce, 1999).

  19. Yuma District Resource Management Plan, Yuma, La Paz, and Mohave Counties, Arizona and San Bernardino, Riverside and Imperial Counties, California

    SciTech Connect

    Not Available

    1985-08-01

    Implementation of a resource management plan is proposed for 1.2 million acres within the 2.7-million-acre Yuma District, located in Yuma, La Paz, and Mohave counties, Arizona and San Bernardino, Riverside, and Imperial counties, California. Under the preferred alternative, wildlife habitat would be a priority consideration on approximately 247,740 acre, and nine special management areas would be designated. A portion of the Cactus Plain and the Chemehuevi/Needles wilderness study areas would be recommended for wilderness designation. Two areas totaling 31,360 acres would be designated as special management areas, and another six areas totaling 155,705 acres would be managed to protect their natural values. Livestock grazing would be authorized at 3998 animal unit months on four allotments. Approximately 55,490 acres of federal lands would be available for disposal and 31,220 acres would be acquired. Nine utility corridors and nine communication sites would be designated. Existing recreational facilities would be maintained, with additional facilities provided when warranted. Along Parker Strip, only floodproofed day-use facilities would be allowed within the 100-year flood plain. Off-road vehicle (ORV) use designations would be made on 640 acres and ORV use in the remainder of the district would be limited to existing roads and trails. Continuous occupancy of mobile home sites would be restricted to one five-month period in a single year. Permanent residential use would be phased out.

  20. Data from a solute transport experiment in the Leviathan Mine drainage, Alpine County, California, October 1982

    USGS Publications Warehouse

    Flint, M.R.; Bencala, K.E.; Zellweger, G.W.; Hammermeister, D.P.

    1985-01-01

    A twenty-four hour injection of chloride and sodium was made into Leviathan Creek, Alpine County, California to aid interpretation of the coupled interactions between physical transport processes and geochemical reactions. Leviathan Creek was chosen because it receives acid mine drainage from Leviathan Mine, an abandoned open-pit sulfur mine. Water samples were collected at 15 sites along a 4.39 kilometer reach and analyzed for chloride, sodium, sulfate and fluoride. Dissolved concentrations are presented in tabular format and time-series plots. Duplicate samples were analyzed by two laboratories: the Central Laboratory, Denver, Colorado and a research laboratory in Menlo Park, California. A tabular comparison of the analyses and plots of the differences between the two laboratories is presented. Hydrographs and instantaneous discharge measurements are included. (USGS)

  1. The Monterey County Health Initiative. A post-mortem analysis of a California Medicaid demonstration project.

    PubMed

    Aved, B M

    1987-01-01

    Twenty months after the California State Department of Health Services turned its Medicaid program in Monterey County over to a local health care authority, the Monterey County Health Initiative (MCHI), the state terminated the pilot project in favor of a return to fee-for-service reimbursement. The MCHI, plagued from its inception with shaky provider support and a flawed program design, failed to demonstrate its anticipated cost savings. The key features of this failure were overly generous fees for primary case managers, inadequate utilization control measures, a general hesitancy to assume the necessary gatekeeper function, and a management information system that was not fully operational until well into the implementation of the program. Policy implications and recommendations for future state-sponsored Medicaid demonstration projects are discussed. PMID:3543525

  2. Digital database of microfossil localities in Alameda and Contra Costa Counties, California

    USGS Publications Warehouse

    McDougall, Kristin; Block, Debra

    2014-01-01

    The eastern San Francisco Bay region (Contra Costa and Alameda Counties, California) is a geologically complex area divided by faults into a suite of tectonic blocks. Each block contains a unique stratigraphic sequence of Tertiary sediments that in most blocks unconformably overlie Mesozoic sediments. Age and environmental interpretations based on analysis of microfossil assemblages are key factors in interpreting geologic history, structure, and correlation of each block. Much of this data, however, is distributed in unpublished internal reports and memos, and is generally unavailable to the geologic community. In this report the U.S. Geological Survey microfossil data from the Tertiary sediments of Alameda and Contra Costa counties are analyzed and presented in a digital database, which provides a user-friendly summary of the micropaleontologic data, locality information, and biostratigraphic and ecologic interpretations.

  3. Characterization of household hazardous waste from Marin County, California, and New Orleans, Louisiana

    SciTech Connect

    Rathje, W.L.; Wilson, D.C.; Lambou, V.W.; Herndon, R.C.

    1987-09-01

    There is a growing concern that certain constituents of common household products, that are discarded in residential garbage, may be potentially harmful to human health and the environment by adversely affecting the quality of ground and surface water. A survey of hazardous wastes in residential garbage from Marin County, California, and New Orleans, Louisiana, was conducted in order to determine the amount and characteristics of such wastes that are entering municipal landfills. The results of the survey indicate that approximately 642 metric tons of hazardous waste are discarded per year for the New Orleans study area and approximately 259 metric tons are discarded per year for the Marin County study area. Even though the percent of hazardous household waste in the garbage discarded in both study areas was less than 1%, it represents a significant quantity of hazardous waste because of the large volume of garbage involved.

  4. Capacity and sedimentation of Loch Lomond Reservoir Santa Cruz County, California

    USGS Publications Warehouse

    Fogelman, R.P.; Johnson, K.L.

    1985-01-01

    A sedimentation study of Loch Lomond Reservoir in Santa Cruz County, California, was begun in 1982 to determine reservoir storage capacity and to establish permanent ranges for future studies. Results of a reservoir survey indicated a total storage capacity of 8,824 acre-ft in 1982. Comparison of thalweg profiles from this survey and a survey done prior to dam construction in 1960 shows that deposition has occurred in the lower reach of the reservoir due to landsliding and in the upper reach due to sediment inflow from Newell Creek. (Author 's abstract)

  5. Perspectives of Mobile Versus Fixed Mammography in Santa Clara County, California: A Focus Group Study

    PubMed Central

    Chang-Halpenny, Christine; Kumarasamy, Narmadan A; Venegas, Angela; Braddock III, Clarence H

    2016-01-01

    Objective: Our aim was to examine underserved women’s perceptions on mobile versus fixed mammography in Santa Clara, California through a focus group study. Background: Research has shown that medically underserved women have higher breast cancer mortality rates correlated with under-screening and a disproportional rate of late-stage diagnosis. The Community Health Partnership in Santa Clara County, California runs the Community Mammography Access Project (CMAP) that targets nearly 20,000 medically underserved women over the age of 40 in the county through the collaborative effort of an existing safety net of healthcare providers. However, little data exists on the advantages or disadvantages of mobile mammography units from the patient perspective.  Methods: We assessed underserved women’s perspectives on mammography services in Santa Clara County through two focus groups from women screened at mobile or fixed site programs. Patients were recruited from both CMAP clinics and a county hospital, and focus group data were analyzed using content analysis. Results: We found that women from both the mobile and fixed sites shared similar motivating factors for getting a mammogram. Both groups recognized that screening was uncomfortable but necessary for good health and had positive feedback about their personal physicians. However, mobile participants, in particular, appreciated the atmosphere of mobile screening, reported shorter wait times, and remarked on the good communication from the clinic staff and empathetic treatment they received. However, mobile participants also expressed concern about the quality of films at mobile sites due to delayed initial reading of the films.  Conclusions: Mobile mammography offers a unique opportunity for women of underserved populations to access high satisfaction screenings, and it encourages a model similar to CMAP in other underserved areas. However, emphasis should be placed on providing a warm and welcoming

  6. Der Humboldt-Dienst des Humboldt-Gymnasiums Berlin (The Humboldt-Dienst of the Humboldt Gymnasium in Berlin)

    ERIC Educational Resources Information Center

    Pegler, Klaus

    1976-01-01

    The Humboldt-Dienst functions as a teaching aid. Some eight times a year it tapes collections of foreign-language information broadcasts, and issues student work sheets and teachers' guides for use therewith. The materials are available at cost; an address for ordering is given. (Text is in German.) (IFS/WGA)

  7. Old seismographs still in operation in Northern California

    USGS Publications Warehouse

    McCormick, E.

    1984-01-01

    Felt earthquakes are frequent on the Cape Mendocino end of the northern San Andreas fault in Humboldt County, California. For this reason a Bosch-Omori seismograph was installed by Horace Winslow of the U.S Coast and Geodetic Survey in teh old city jail in Ferndale as early as 1932. In 1981 the seismograph was moved to the Ferndale Museum where it is monitored now by James Scalvini. Data from the seismograph are sent to the Survey's National Earthquake Information Service in Golden, Colorado. 

  8. Ground-water resources of Honey Lake valley, Lassen County, California, and Washoe County, Nevada

    USGS Publications Warehouse

    Handman, E.H.; Londquist, C.J.; Maurer, D.K.

    1990-01-01

    Honey Lake Valley is a 2,200 sq-mi, topographically closed basin about 35 miles northwest of Reno, Nevada. Unconsolidated basin-fill deposits on the valley floor and fractured volcanic rocks in northern and eastern uplands are the principal aquifers. In the study area, about 130,000 acre- ft of water recharges the aquifer system annually, about 40% by direct infiltration of precipitation and about 60% by infiltration of streamflow and irrigation water. Balancing this is an equal amount of groundwater discharge, of which about 65% evaporates from the water table or is transpired by phreatophytes, about 30 % is withdrawn from wells, and about 5% leaves the basin as subsurface outflow to the east. Results of a groundwater flow model of the eastern part of the basin, where withdrawals for public supply have been proposed, indicate that if 15,000 acre-ft of water were withdrawn annually, a new equilibrium would eventually be established by a reduction of about 60% in both evapotranspiration and subsurface outflow to the east. Hydrologic effects would be minimal at the western boundary of the flow-model area. Within the modeled area, the increased withdrawals cause an increase in the simulated net flow of groundwater eastward across the California-Nevada State line from about 670 acre-ft/yr to about 2,300 acre-ft/yr. (USGS)

  9. Geologic map of the Mound Spring quadrangle, Nye and Clark Counties, Nevada, and Inyo County, California

    USGS Publications Warehouse

    Lundstrom, Scott C.; Mahan, Shannon; Blakely, Richard J.; Paces, James B.; Young, Owen D.; Workman, Jeremiah B.; Dixon, Gary L.

    2003-01-01

    The Mound Spring quadrangle, the southwestern-most 7.5' quadrangle of the area of the Las Vegas 1:100,000-scale quadrangle, is entirely within the Pahrump Valley, spanning the Nevada/California State line. New geologic mapping of the predominantly Quaternary materials is combined with new studies of gravity and geochronology in this quadrangle. Eleven predominantly fine-grained units are delineated, including playa sediment, dune sand, and deposits associated with several cycles of past groundwater discharge and distal fan sedimentation. These units are intercalated with 5 predominantly coarse-grained alluvial-fan and wash gravel units mainly derived from the Spring Mountains. The gravel units are distinguished on the basis of soil development and associated surficial characteristics. Thermoluminescence and U-series geochronology constrain most of the units to the Holocene and late and middle Pleistocene. Deposits of late Pleistocene groundwater discharge in the northeast part of the quadrangle are associated with a down-to-the-southwest fault zone that is expressed by surface fault scarps and a steep gravity gradient. The gravity field also defines a northwest-trending uplift along the State line, in which the oldest sediments are poorly exposed. About 2 km to the northeast a prominent southwest-facing erosional escarpment is formed by resistant beds in middle Pleistocene fine-grained sediments that dip northeast away from the uplift. These sediments include cycles of groundwater discharge that were probably caused by upwelling of southwesterly groundwater flow that encountered the horst.

  10. Neotectonics of the southern Amargosa Desert, Nye County, Nevada and Inyo County, California

    SciTech Connect

    Donovan, D.E.

    1991-05-01

    A complex pattern of active faults occurs in the southern Amargosa Desert, southern Nye, County, Nevada. These faults can be grouped into three main fault systems: (1) a NE-striking zone of faults that forms the southwest extension of the left-lateral Rock Valley fault zone, in the much larger Spotted Range-Mine Mountain structural zone, (2) a N-striking fault zone coinciding with a NNW-trending alignment of springs that is either a northward continuation of a fault along the west side of the Resting Spring Range or a N-striking branch fault of the Pahrump fault system, and (3) a NW-striking fault zone which is parallel to the Pahrump fault system, but is offset approximately 5 km with a left step in southern Ash Meadows. These three fault zones suggest extension is occurring in an E-W direction, which is compatible with the {approximately}N10W structural grain prevalent in the Death Valley extensional region to the west.

  11. Repeated West Nile Virus Epidemic Transmission in Kern County, California, 2004–2007

    PubMed Central

    REISEN, WILLIAM K.; CARROLL, BRIAN D.; TAKAHASHI, RICHARD; FANG, YING; GARCIA, SANDRA; MARTINEZ, VINCENT M.; QUIRING, ROB

    2009-01-01

    West Nile virus (WNV) has remained epidemic in Kern County, CA, since its introduction in 2004 through 2007 when the human case annual incidence increased from 6 – 8 to 17 per 100,000, respectively. The 2007 increase in human infection was associated with contradicting surveillance indicators, including severe drought, warm spring but cool summer temperature anomalies, decreased rural and urban mosquito abundance but increased early season infection in urban Culex quinquefasciatus Say, moderate avian “herd immunity,” and declines in the catch of competent (western scrub-jay and house finch) and noncompetent (California quail and mourning dove) avian species. The decline in these noncompetent avian hosts may have increased contact with competent avian hosts and perhaps humans. The marked increase in home foreclosures and associated neglected swimming pools increased urban mosquito production sites, most likely contributing to the urban mosquito population and the WNV outbreak within Bakersfield. Coalescing five surveillance indicators into a risk assessment score measured each half month provided 2- to 6-wk early warning for emergency planning and was followed consistently by the onset of human cases after reaching epidemic conditions. St. Louis encephalitis virus (SLEV) antibody was detected rarely in wild birds but not mosquitoes or sentinel chickens, indicating that previously infected birds were detected in Kern County, but SLEV reintroduction was not successful. In contrast, western equine encephalitis virus (WEEV) was detected during 3 of 5 yr in Culex tarsalis Coquillett, sentinel chickens, and wild birds, but failed to amplify to levels where tangential transmission was detected in Aedes mosquitoes or humans. A comparison of transmission patterns in Kern County to Coachella Valley in the southeastern desert of California showed the importance of mosquito phenology and spatial distribution, corvids, or other avian “super spreaders” and anthropogenic

  12. Repeated West Nile virus epidemic transmission in Kern County, California, 2004-2007.

    PubMed

    Reisen, William K; Carroll, Brian D; Takahashi, Richard; Fang, Ying; Garcia, Sandra; Martinez, Vincent M; Quiring, Rob

    2009-01-01

    West Nile virus (WNV) has remained epidemic in Kern County, CA, since its introduction in 2004 through 2007 when the human case annual incidence increased from 6-8 to 17 per 100,000, respectively. The 2007 increase in human infection was associated with contradicting surveillance indicators, including severe drought, warm spring but cool summer temperature anomalies, decreased rural and urban mosquito abundance but increased early season infection in urban Culex quinquefasciatus Say, moderate avian "herd immunity," and declines in the catch of competent (western scrub-jay and house finch) and noncompetent (California quail and mourning dove) avian species. The decline in these noncompetent avian hosts may have increased contact with competent avian hosts and perhaps humans. The marked increase in home foreclosures and associated neglected swimming pools increased urban mosquito production sites, most likely contributing to the urban mosquito population and the WNV outbreak within Bakersfield. Coalescing five surveillance indicators into a risk assessment score measured each half month provided 2- to 6-wk early warning for emergency planning and was followed consistently by the onset of human cases after reaching epidemic conditions. St. Louis encephalitis virus (SLEV) antibody was detected rarely in wild birds but not mosquitoes or sentinel chickens, indicating that previously infected birds were detected in Kern County, but SLEV reintroduction was not successful. In contrast, western equine encephalitis virus (WEEV) was detected during 3 of 5 yr in Culex tarsalis Coquillett, sentinel chickens, and wild birds, but failed to amplify to levels where tangential transmission was detected in Aedes mosquitoes or humans. A comparison of transmission patterns in Kern County to Coachella Valley in the southeastern desert of California showed the importance of mosquito phenology and spatial distribution, corvids, or other avian "super spreaders" and anthropogenic factors in

  13. Mapping Episodic Stream Activity for the Ridgecrest Solar Power Project, Kern County, California

    NASA Astrophysics Data System (ADS)

    Thibodeaux-Yost, S. N.; Brady, R. H., III; Vyverberg, K.; Weinman, B.

    2013-12-01

    Large-scale renewable energy projects are being developed in the California desert region on large tracts of predominantly undeveloped land (total area of developed land for individual project sites vary from 327 acres to 8,230 acres). The absence of a standard method of identifying and accounting for episodic streams in arid and semi-arid (dryland) regions is an area of conflict between project developers and the government agencies responsible for protecting natural resources and permitting renewable energy projects. There is a need for an accurate dryland stream delineation protocol that is consistent, efficient, accessible, and accurately reflects the extent and distribution of streams on a site. Dryland stream delineation protocol based on a scientific, geomorphic and ecological understanding of dryland stream processes will help ensure dryland streams are accurately identified for the purposes of environmental impact assessments and project permitting. Such a method is currently being developed by the California Energy Commission (CEC) and the Department of Fish and Wildlife (CDFW). This thesis work critically evaluates the stream delineation and stream impact assessment previously completed by the developer for the proposed renewable energy project in El Paso Fan, El Paso Mountains, Ridgecrest, Kern County, California. This evaluation is then compared and contrasted with the results achieved in the field using the MESA (Mapping Episodic Stream Activity) stream delineation methods and protocols and mobile GIS mapping technology.

  14. Blood-feeding patterns of the Culex pipiens complex in Sacramento and Yolo Counties, California.

    PubMed

    Montgomery, Matthew J; Thiemann, Tara; Macedo, Paula; Brown, David A; Scott, Thomas W

    2011-03-01

    Mosquitoes in the Culex pipiens complex are competent vectors of West Nile virus (WNV; family Flaviviridae, genus Flavivirus) in the laboratory, and field-collected mosquitoes have tested positive for the virus in California and elsewhere. A better understanding of Cx. pipiens complex blood-feeding patterns will help define the threat that these mosquitoes pose to human health and their role in WNV amplification in northern California. We collected blood-engorged Cx. pipiens complex mosquitoes from resting sites near and away from human habitation in Sacramento and Yolo Counties. Cytochrome c oxidase 1 gene sequences were used to identify the vertebrate species from which blood meals were taken. Of 330 engorged mosquitoes collected at 28 sites from June through August 2007 and May through August 2008, >99% fed on an avian host. Three mosquitoes contained bovine blood and none had fed on a human. American Robins (Turdus migratorius) were bitten most often, and the proportion of American Robin blood meals increased significantly over the summer. Other important avian hosts included House Finches (Carpodacus mexicanus), Barn Swallows (Hirundo rustica), Western Meadowlarks (Sturnella neglecta), and Mourning Doves (Zenaida macroura). In rural areas, Barn Swallows, Brewer's Blackbirds (Euphagus cyanocephalus), and House Sparrows (Passer domesticus) were frequent hosts. In settings near human habitation, Mourning Doves and Western Meadowlarks were common hosts. Our data indicate that in north central California mosquitoes in the Cx. pipiens complex may be more important as epiornitic than epidemic vectors of WNV. PMID:21485380

  15. Measles outbreak associated with an arriving refugee - Los Angeles County, California, August-September 2011.

    PubMed

    2012-06-01

    Measles is a highly communicable, acute viral illness with potential for severe complications, including death. Although endemic measles was eliminated in the United States in 2000 as a result of widespread vaccination, sporadic measles outbreaks still occur, largely associated with international travel from measles-endemic countries and pockets of unvaccinated persons. On August 26, 2011, the Los Angeles County Department of Public Health (LACDPH) was notified of suspected measles in a refugee from Burma who had arrived in Los Angeles, California, on August 24, after a flight from Kuala Lumpur, Malaysia. Passengers on the flight included 31 other refugees who then traveled to seven other states, widening the measles investigation and response activities. In California alone, 50 staff members from LACDPH and the California Department of Public Health (CDPH) interviewed and reinterviewed 298 contacts. Measles was diagnosed in three contacts of the index patient (patient A). The three contacts with measles were two passengers on the same flight as patient A and a customs worker; no secondary cases were identified. Delayed diagnosis of measles in patient A and delayed notification of health officials precluded use of measles-mumps-rubella (MMR) vaccine as an outbreak intervention. This outbreak emphasizes the importance of maintaining a high level of vaccination coverage and continued high vigilance for measles in the United States, particularly among incoming international travelers; clinicians should immediately isolate persons with suspected measles and promptly report them to health authorities. PMID:22647743

  16. Resource assessment of low- and moderate-temperature geothermal waters in Calistoga, Napa County, California. Report of the second year, 1979 to 1980 of the US Department of Energy-California State-Coupled Program for reservoir assessment and confirmation

    SciTech Connect

    Youngs, L.G.; Bacon, C.F.; Chapman, R.H.; Chase, G.W.; Higgins, C.T.; Majmundar, H.H.; Taylor, G.C.

    1980-11-10

    Statewide assessment studies included updating and completing the USGS GEOTHERM File for California and compiling all data needed for a California Geothermal Resources Map. Site specific assessment studies included a program to assess the geothermal resource at Calistoga, Napa County, California. The Calistoga effort was comprised of a series of studies involving different disciplines, including geologic, hydrologic, geochemical and geophysical studies.

  17. Mitigation action plan sale of Naval Petroleum Reserve No. 1 (Elk Hills) Kern County, California

    SciTech Connect

    1998-01-01

    Naval Petroleum Reserve No. 1 (NPR-1, also called {open_quotes}Elk Hills{close_quotes}), a Federally-owned oil and gas production field in Kern County, California, was created by an Executive Order issued by President Taft on September 2, 1912. He signed another Executive Order on December 13, 1912, to establish Naval Petroleum Reserve No. 2 (NPR-2), located immediately south of NPR-1 and containing portions of the town of Taft, California. NPR-1 was not developed until the 1973-74 oil embargo demonstrated the nation`s vulnerability to oil supply interruptions. Following the embargo, Congress passed the Naval Petroleum Reserves Production Act of 1976 which directed that the reserve be explored and developed to its fall economic potential at the {open_quotes}maximum efficient rate{close_quotes} (MER) of production. Since Elk Hills began full production in 1976, it has functioned as a commercial operation, with total revenues to the Federal government through FY 1996 of $16.4 billion, compared to total exploration, development and production costs of $3.1 billion. In February 1996, Title 34 of the National Defense Authorization Act for Fiscal Year 1996 (P.L. 104-106), referred to as the Elk Hills Sales Statute, directed the Secretary of Energy to sell NPR-1 by February 10, 1998.The Secretary was also directed to study options for enhancing the value of the other Naval Petroleum and Oil Shale Reserve properties such as NPR-2, located adjacent to NPR-1 in Kern County- Naval Petroleum Reserve No. 3 (NPR-3) located in Natrona County, Wyoming; Naval Oil Shale Reserves No. 1 and No. 3 (NOSR-1 and NOSR-3) located in Garfield County, Colorado; and Naval Oil Shale Reserve No. 2 (NOSR-2) located in Uintah and Carbon Counties, Utah. The purpose of these actions was to remove the Federal government from the inherently non-Federal function of operating commercial oil fields while making sure that the public would obtain the maximum value from the reserves.

  18. From the Catbird Seat. A History of Women's Studies at Humboldt State University, 1971-1996.

    ERIC Educational Resources Information Center

    Corbett, Kathryn L.; Preston, Kathleen

    This 25-year history of the women's studies program at Humboldt State University (California) is based on two surveys completed by former and current program leaders (n=10), faculty members (n=18), and students (n=201), as well as on the authors' personal recollections. After an introductory chapter, individual chapters address the following…

  19. Deep-ocean disposal of sewage sludge off Orange County, California: a research plan

    SciTech Connect

    Brooks, N.H.; Arnold, R.G.; Koh, R.C.Y.; Jackson, G.A.; Faisst, W.K.

    1982-11-01

    A seven-year research program is recommended to study the environmental and possible health effects of a proposed ocean discharge of sewage sludge via a special pipeline to an unprecedented depth of about 1000 to 1300 feet (300 to 400 meters) off the coast of Orange County in southern California. The research is related to a proposal by the County Sanitation Districts of Orange County (CSDOC) for discharge of its sludge through a small pipeline terminating 7.5 miles (12 kilometers) from the mouth of the Santa Ana River at a depth of 1000 to 1300 feet (300 to 400 m). The pipe (about 18 in. in diameter) would be continuously welded and coated both internally and externally; it could easily be laid from a pipelaying barge. Savings attributable to this option would be nearly $10 million per year, including the annualized cost of capital as well as annual operation, maintenance, research and monitoring costs. The environmental impacts of ocean disposal are expected to be slight, based on what is currently known. No human health impact of risk is anticipated. If the research plan presented herein reveals unacceptable impacts, CSDOC will modify or discontiue its ocean discharge operations. Upon termination of the discharge, any sludge-related changes in biological communities are expected to be reversed within only a few years. CSDOC is currently seeking approval to conduct this experiment through special legislation and/or regulatory actions at both state and federal levels. Specific goals of the research plan are discussed.

  20. Resource assessment of low- and moderate-temperature geothermal waters in Calistoga, Napa County, California. Report of the second year, 1979-1980

    SciTech Connect

    Youngs, L.G.; Bacon, C.F.; Chapman, R.H.; Chase, G.W.; Higgins, C.T.; Majmundar, H.H.; Taylor, G.C.

    1980-11-10

    Phase I studies included updating and completing the USGS GEOTHERM file for California and compiling all data needed for a California Geothermal Resources Map. Phase II studies included a program to assess the geothermal resource at Calistoga, Napa County, California. The Calistoga effort was comprised of a series of studies involving different disciplines, including geologic, hydrologic, geochemical and geophysical studies.

  1. 76 FR 21329 - Humboldt-Toiyabe National Forest; Nevada; Environmental Impact Statement for Geothermal Leasing...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-04-15

    ...The Humboldt-Toiyabe National Forest (HTNF) will prepare an environmental impact statement (EIS) to evaluate certain National Forest System (NFS) lands for geothermal leasing availability. The project area includes NFS lands on the HTNF in Douglas, Lyon, Mineral, Lander, Nye and White Pine County,...

  2. Identification of environmental issues: Hybrid wood-geothermal power plant, Wendel-Amedee KGRA, Lassen County, California: First phase report

    SciTech Connect

    Not Available

    1981-08-14

    The development of a 55 MWe power plant in Lassen County, California, has been proposed. The proposed power plant is unique in that it will utilize goethermal heat and wood fuel to generate electrical power. This report identifies environmental issues and constraints which may impact the proposed hybrid wood-geothermal power plant. (ACR)

  3. NAVEL BASE VENTURA COUNTY, PORT HUENEME, CALIFORNIA EPA CHARACTERIZATION TEST CELL REPORT ON ELECTROMAGNETIC SURVEYS IN THE TEST CELL AREA

    EPA Science Inventory

    The objective of the geophysical surveys at the EPA Characterization Test Cell (CTC) area (Site) at Naval Base Ventura County, Port Hueneme, California is to locate geophysical anomalies indicative of metallic objects within the area of the cell. The goal was to provide backgroun...

  4. Advanced Placement Programs and Economics. Including a Case Study: Formulating an Advanced Placement Program in Economics in Orange County, California.

    ERIC Educational Resources Information Center

    Bremer, James Walter

    In Spring 1967, the "Leadership Group of High School Teachers of Economics" in Orange County, California, expressed interest in developing an Advanced Placement Program (APP) in Economics. They were concerned that students from the stronger secondary school economics programs would find introductory college economics repetitive. This concern…

  5. ANAEROBIC DEGRADATION OF MTBE TO TBA IN GROUND WATER AT GASOLINE SPILL SITES IN ORANGE COUNTY, CALIFORNIA

    EPA Science Inventory

    Although tert-Butyl Alcohol (TBA) has not been used as a fuel oxygenate in Orange County, California, the concentrations of TBA in ground water at gasoline spill sites are high compared to the concentrations of the conventional fuel oxygenate Methyl tert-Butyl Ether (MTBE). In t...

  6. IDENTIFYING THE CAUSE OF HIGH CONCENTRATIONS OF TBA IN GROUNDWATER AT GASOLINE SPIILL SITES IN ORANGE COUNTY, CALIFORNIA

    EPA Science Inventory

    Monitoring at gasoline spills in Orange County, California has revealed that TBA (tertiary butyl alcohol) is often present at high concentrations in ground water. To manage the hazard associated with the presence of TBA, staff of the UST Local Oversight Program (LOP) of the Oran...

  7. GAIN: Program Strategies, Participation Patterns, and First-Year Impacts in Six Counties. California's Greater Avenues for Independence Program.

    ERIC Educational Resources Information Center

    Riccio, James; Friedlander, Daniel

    The first findings of an evaluation of California's welfare-to-work program, Greater Avenues for Independence (GAIN), related to its impact on employment, earnings, and welfare payments. The impact results came from a study of applicants for and recipients of Aid to Families with Dependent Children (AFDC) in six counties and were limited to the…

  8. HYDROGEOLOGICAL AND GEOCHEMICAL FACTORS INFLUENCING MERCURY FATE AND TRANSPORT AT THE SULPHUR BANK MERCURY MINE, LAKE COUNTY, CALIFORNIA

    EPA Science Inventory

    Clear Lake, located approximately 150 km north of San Francisco in Lake County, is one of the largest fresh water lakes in the California. Elevated mercury levels were first identified in fish from Clear Lake in the late 1970s and early 1980s. Although naturally occurring mercury...

  9. Preliminary report on water storage capacity of unconsolidated deposits beneath the Lompoc Plain, Santa Barbara County, California

    USGS Publications Warehouse

    Upson, Joseph E.

    1943-01-01

    The Lompoc Plain is the central lowland of a topographic and structural basin that forms the western and lower part of the Santa Ynes Valley in Santa Barbara County, California. It extends inland about 11 miles from the coast and is 1 mile fto about 3 miles wide.

  10. School-Site Administrators: A California County and Regional Perspective on Labor Market Trends. Issues & Answers. REL 2010-No. 084

    ERIC Educational Resources Information Center

    White, Melissa Eiler; Fong, Anthony B.; Makkonen, Reino

    2010-01-01

    This study explores the differences among California's counties and regions in their needs for new school-site administrators in the coming decade, as driven by a combination of projected administrator retirements and projected student enrollment changes. The projected need for new school-site administrators, based solely on these combined…

  11. Who Tills the Soil? Mexican-American Workers Replace the Small Farmer in California: An Example from Colusa County.

    ERIC Educational Resources Information Center

    Moles, Jerry A.

    1979-01-01

    Documenting the impact of technological advancements upon the American farmer, this article describes a rural California county where the small farmers have had to sell or lease their land to larger enterprises who then recruit Mexican American farm workers to replace the labor once provided by the small farmer. (JC)

  12. Occupational Behaviors and Farmworkers’ Pesticide Exposure: Findings From a Study in Monterey County, California

    PubMed Central

    Salvatore, Alicia L.; Bradman, Asa; Castorina, Rosemary; Camacho, José; López, Jesús; Barr, Dana B.; Snyder, John; Jewell, Nicholas P.; Eskenazi, Brenda

    2008-01-01

    Background We studied the relationship between behaviors promoted through the US Environmental Protection Agency Worker Protection Standard (WPS) and other programs and agricultural pesticide exposures in 73 strawberry fieldworkers employed in Monterey County, California. Methods Farmworkers’ behaviors were assessed via self-report and organophosphorus (OP) pesticide exposure was measured using dimethyl alkylphosphate (DMAP) and malathion dicarboxylic acid (MDA) urinary metabolite levels. Results Wearing WPS-recommended clothing, wearing clean work clothes, and the combination of handwashing with soap and wearing gloves were associated with decreases in DMAP and MDA metabolite levels. Despite these protective behaviors, however, participants had significantly higher levels of exposure as compared with a national reference sample. Conclusions Interventions that facilitate compliance with these behaviors may be effective in decreasing fieldworkers’ pesticide exposures. However, further efforts are needed to reduce the exposure disparities experienced by farmworkers and decrease the potential for “take home” exposures to farmworkers’ families. PMID:18702096

  13. Summary geochemical maps, Hoover Wilderness and adjacent study area, Mono and Tuolumne counties, California

    USGS Publications Warehouse

    Chaffee, M.A.; Hill, R.H.; Sutley, S.J.

    1984-01-01

    The Hoover Wilderness and the adjacent Hoover Extension (East), Hoover Extension (West), and Cherry Creek A Roadless Areas (the adjacent study area) encompass approximately 153,900 acres (241 mi2; 623 km2) in the Inyo, Stanislaus, and Toiyabe Naitonal Forests, Mono and Tuolumne Counties, Calif. These two areas lie along and mostly east of the crest of the Sierra Nevada, along the north and east sides of Yosemite National Park. Elevations vary from a high of 12,446 ft (3,793 m) on the crest of the Sierra Nevada to a low of about 6,500 ft (1,981 m) near the Bridgeport Ranger Station. Access to the Hoover Wilderness and adjacent study area is by U.S. Highway 395, California State Highways 108 (Sonora Pass) and 120 (Tioga Pass), and by other paved and graded roads that lead off of these U.S. and State highways.

  14. A critical assessment of the Burning Index in Los Angeles County, California

    USGS Publications Warehouse

    Schoenberg, F.P.; Chang, H.-C.; Keeley, J.E.; Pompa, J.; Woods, J.; Xu, H.

    2007-01-01

    The Burning Index (BI) is commonly used as a predictor of wildfire activity. An examination of data on the BI and wildfires in Los Angeles County, California, from January 1976 to December 2000 reveals that although the BI is positively associated with wildfire occurrence, its predictive value is quite limited. Wind speed alone has a higher correlation with burn area than BI, for instance, and a simple alternative point process model using wind speed, relative humidity, precipitation and temperature well outperforms the BI in terms of predictive power. The BI is generally far too high in winter and too low in fall, and may exaggerate the impact of individual variables such as wind speed or temperature during times when other variables, such as precipitation or relative humidity, render the environment ill suited for wildfires. ?? IAWF 2007.

  15. Chlorofluorocarbon dating of herbicide-containing well waters in Fresno and Tulare counties, California

    USGS Publications Warehouse

    Spurlock, F.; Burow, K.; Dubrovsky, N.

    2000-01-01

    Simazine, diuron, and bromacil are the most frequently detected currently registered pesticides in California groundwater. These herbicides have been used for several decades in Fresno and Tulare counties, California; however, previous data are inadequate to determine whether the detections are a result of recent or historical applications (i.e., within the last decade, or 20-30 yr ago). Chlorofluorocarbon (CFC) groundwater age-dating was used in conjunction with one-dimensional transport modeling to address this question. The estimated times between herbicide application and subsequent detection in groundwater samples from 18 domestic wells ranged from 3 to 33 yr; the aggregate data indicate that more than half of the detections are associated with applications in the last decade. The data also suggest that changes in groundwater quality arising from modified management practices will probably not be discernible for at least a decade. A secondary objective of this study was to evaluate the contribution of simazine degradates deethylsimazine (DES; 2-amino-4-chloro-6-ethylamino-s-triazine) and diaminochlorotriazine (DACT; 2,4-diamino-6-chloro-s-triazine) to total triazine concentrations (defined here as simazine + DES + DACT) in 30 domestic wells. The N-dealkylated s- chlorotriazine degradates DES and DACT substantially contribute to total triazine concentrations in Fresno and Tulare County groundwater, composing 24 to 100% of the total triazines, with a median of 82%. If s-chlorotriazines display a common mode of toxicological action, the prevalence of triazine degradates in water samples found in this and other studies indicate that drinking water standards based on total s-chlorotriazine concentrations may be most appropriate.

  16. 76 FR 26224 - Revisions to the California State Implementation Plan, Northern Sonoma County Air Pollution...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-05-06

    ... Pollution Control District (NSCAPCD) and Mendocino County Air Quality Management District (MCAQMD) AGENCY... the Northern Sonoma County Air Pollution Control District (NSCAPCD) and Mendocino County Air Quality... Mendocino County Air Quality Management District (MCAQMD) Rule 130--Definitions. In ] the Rules...

  17. Map showing mineral-resource potential of the King Range and Chemise Mountain Instant Study Areas, Humboldt and Mendocino counties, California

    USGS Publications Warehouse

    McLaughlin, R.J.; Sorg, D.H.; Ohlin, H.N.; Beutner, E.C.

    1981-01-01

    Minor manganese resources occur adjacent to the southeast corner of the King Range Instant Study Area near Queen Peak. The manganese forms small stratabound deposits associated with radiolarian chert and pillow basalt. The known deposits are too small and the manganese too low in concentration for further economic exploitation. Similar manganese mineralization may be within the belt of melange in the southeast corner of the King Range area and within the Chemise Mountain Instant Study Area, but economic deposits are unlikely. Although there has been historical base- and precious-metal exploration activity north of the King Range in the Mattole River drainage, our geologic and geochemical field data indicate almost no gold potential and low potentials for lead, zinc, copper, and silver. During this investigation, one high-grade vein and several minor veins containing lead, zinc, copper, and silver were discovered at Point Delgada immediately south of the King Range Instant Study Area. The vein mineralization is Miocene and cuts Cretaceous basalt flows, dikes, flow breccia, and younger overlying sedimentary rocks of the King Range. The vein mineralization at Point Delgada could be remobilized from more extensive unexposed stratabound base-metal mineralization at depth. Traces of lead and zinc detected within the King Range Instant Study Area may have similar stratabound or vein origins, but no resource potential is indicated. Minor copper mineralization with associated lead, zinc, and manganese anomalies within the Chemise Mountain Instant Study Area is of low economic potential because of the shearing, isolation, and lenticularity of the basaltic and cherty rocks within the melange mineralization.

  18. Late Pleistocene sediments and fossils near the mouth of Mad River, Humboldt County, California: Facies analysis, sequence development, and possible age correlation

    SciTech Connect

    Harvey, E.W. . Dept. of Geological Sciences)

    1994-04-01

    Study of late Pleistocene-age sediments near the mouth of the Mad River revealed a sequence of nearshore marine and shallow bay deposits. This sequence, bounded by unconformities, is informally named the Mouth of Mad unit. The Mouth of mad unit can be divided into four distinct depositional facies at the study site. The lowest facies are the Nearshore Sand and Estuarine Mud, which lie unconformably on a paleosol. The sand facies grades upward into a high-energy, interbedded Nearshore Sand and Gravel facies containing storm and rip-channel deposits. Above the sand and gravel is a Strand-Plain Sand facies. This sand is overlain by a laterally variable sequence of shell-rich Bay facies. The bay deposits can be further divided into five subfacies: (1) a Bioturbated Sand; (2) a Lower Tidal Flat Mud; (3) a Mixed Sand and Mud; (4) an oyster-rich Bay Mud; and (5) an Upper Tidal Flat Mud. The bay sequence is overlain unconformably by younger late Pleistocene-age marine terrace deposits. The depositional environments represented by these facies progress from a shoreline estuary to nearshore deposits, above storm wave base, and slowly back to shoreline and finally shallow bay conditions. The Mouth of Mad unit represents a transgressive-regressive sequence, involving the development of a protective spit. The uppermost mud within the Mouth of Mad unit has been dated, using thermoluminescence age estimation, at 176 [+-] 33 ka, placing it in the late Pleistocene. The Mouth of Mad unit appears to be younger than the fossiliferous deposits at Elk Head, Crannell Junction, Trinidad Head, Moonstone Beach, and the Falor Formation near Maple Creek, and possibly time equivalent with gravel deposits exposed at the western end of School Road in McKinleyville.

  19. Evidence of Mercurial Contamination and Denundation Downstream of New Idria Mercury Mine, San Benito County, California

    NASA Astrophysics Data System (ADS)

    Letsinger, H. E.; Sharma, R. K.; Weinman, B.

    2014-12-01

    California's Central Valley water quality and soils are essential to the survival of the valley's communities and agriculture. Therefore, detection of possible contaminants within the valley streams and soils are paramount to the protection of this land and the people that depend upon it. Here we explore the impact of the contaminated stream beds near the New Idria Mercury Mine site, San Benito County, California. Previous work by Ganguli et al. (2000) has been done in this area to determine the mercury levels associated with the water that flows near the ghost town of New Idria. We performed geochemical analyses on the finer bed sediments from channels draining the area, as well as the coarser sediments taken from along the channel banks, to determine mercury transport downriver from the source. Using a novel application of tau, a mass transfer coefficient typically used in critical zone studies or soil production and weathering rates, we determine downstream weathering, accumulation, and transport of mercury. Our initial geochemical data showed higher tau values upstream as well as within the banks of the contaminated streambed and a greater accumulation of mercury near the pollution source (i.e., mine tailings, (τ ~ 103)). Tau results also show elevated mercurial levels existing downstream, with accumulations in mid- (τ ~ 102) and down-stream (τ ~ 10) reaches. Combining tau results with more traditional indices of chemical weathering (CIA) support consistent overall Hg-weathering processes with low levels of chemical weathering and higher dominance of coupled physical-anthropogenic weathering.

  20. Devitoite, A New Heterophyllosilcate Mineral with Astrophyllite-Like Layers from Eastern Fresno County, California

    SciTech Connect

    Kampf, Anthony R.; Rossman, George R.; Steele, Ian M.; Pluth, Joseph J.; Dunning, Gail E.; Walstrom, Robert E.

    2010-03-30

    Devitoite, [Ba{sub 6}(PO{sub 4}){sub 2}(CO{sub 3})] [Fe{sup 2+}{sub 7}Fe{sup 3+}{sub 2}(Si{sub 4}O{sup 12}){sub 2}O{sub 2}(OH){sub 4}], is a new mineral species from the Esquire No.8 claim along Big Creek in eastern Fresno County, California, U.S.A. It is also found at the nearby Esquire No.7 claim and at Trumbull Peak in Mariposa County. The mineral is named for Alfred (Fred) DeVito (1937-2004). Devitoite crystallized very late in a sequence of minerals resulting from fluids interacting with a quartz-sanbornite vein along its margin with the country rock. The mineral occurs in subparallel intergrowths of very thin brown blades, flattened on {l_brace}001{r_brace} and elongate and striated parallel to [100]. The mineral has a cream to pale brown streak, a silky luster, a Mohs hardness of approximately 4, and two cleavages: {l_brace}001{r_brace} perfect and {l_brace}010{r_brace} good.

  1. Daily mortality and air pollution in Santa Clara County, California: 1989-1996.

    PubMed Central

    Fairley, D

    1999-01-01

    Since the last revision of the national particulate standards, there has been a profusion of epidemiologic research showing associations between particulates and health effects--mortality in particular. Supported by this research, the U.S. Environmental Protection Agency promulgated a national standard for particulate matter [less than/equal to] 2.5 microm in aerodynamic diameter (PM(2.5)). Nevertheless, the San Francisco Bay Area of California may meet this new standard. This study investigates the relationship between daily mortality and air pollution in Santa Clara County (a Bay Area county) using techniques similar to those utilized in earlier epidemiologic studies. Statistically significant associations persist in the early 1990s, when the Bay Area met national air pollution standards for every criteria pollutant. Of the various pollutants, the strongest associations occur with particulates, especially ammonium nitrate and PM(2.5). The continuing presence of associations between mortality and air pollutants calls into question the adequacy of national standards for protecting public health. PMID:10417361

  2. Water-Quality Data for the Lower Russian River Basin, Sonoma County, California, 2003-2004

    USGS Publications Warehouse

    Anders, Robert; Davidek, Karl; Koczot, Kathryn M.

    2006-01-01

    In 2003, the U.S. Geological Survey, in cooperation with the Sonoma County Water Agency, began a study to determine the chemical, microbiological, and isotopic composition of the surface water and ground water in selected areas of the Lower Russian River Basin, Sonoma County, California. This report is a compilation of the hydrologic and water-quality data collected from 10 Russian River sites, 1 gravel-terrace pit site, 12 ground-water sites, 11 tributary sites including Mark West Creek, and 2 estuary sites between the city of Healdsburg and the Pacific Ocean, for the period August 2003 to September 2004. Field measurements made included streamflow, barometric pressure, dissolved oxygen, pH, specific conductance, and turbidity. Water samples were analyzed for nutrients, major ions, total and dissolved organic carbon, trace elements, mercury, wastewater compounds, total coliform, Escherichia coli, Enterococci, Clostridium perfringens, and the stable isotopes of hydrogen and oxygen. Discharge measurements and sampling techniques were modified to accommodate the very low summer flows at most of the tributaries, and discharge measurements were made with an acoustic Doppler velocity meter at the estuary river site to overcome the complexities associated with tidal influences.

  3. An analysis of asthma hospitalizations, air pollution, and weather conditions in Los Angeles County, California

    PubMed Central

    Delamater, Paul L.; Finley, Andrew O.; Banerjee, Sudipto

    2012-01-01

    There is now a large body of literature supporting a linkage between exposure to air pollutants and asthma morbidity. However, the extent and significance of this relationship varies considerably between pollutants, location, scale of analysis, and analysis methods. Our primary goal is to evaluate the relationship between asthma hospitalizations, levels of ambient air pollution, and weather conditions in Los Angeles (LA) County, California, an area with a historical record of heavy air pollution. County-wide measures of Carbon Monoxide (CO), Nitrogen Dioxide (NO2), Ozone (O3), Particulate Matter < 10 μ m (PM10), Particulate Matter < 2.5 μ m (PM2.5), maximum temperature, and relative humidity were collected for all months from 2001 to 2008. We then related these variables to monthly asthma hospitalization rates using Bayesian regression models with temporal random effects. We evaluated model performance using a goodness of fit criterion and predictive ability. Asthma hospitalization rates in LA County decreased between 2001 and 2008. Traffic-related pollutants, CO and NO2, were significant and positively correlated with asthma hospitalizations. PM2.5 also had a positive, significant association with asthma hospitalizations. PM10, relative humidity, and maximum temperature produced mixed results, whereas O3 was non-significant in all models. Inclusion of temporal random effects satisfies statistical model assumptions, improves model fit, and yields increased predictive accuracy and precision compared to their non-temporal counterparts. Generally, pollution levels and asthma hospitalizations decreased during the 9 year study period. Our findings also indicate that after accounting for seasonality in the data, asthma hospitalization rate has a significant positive relationship with ambient levels of CO, NO2, and PM2.5. PMID:22475217

  4. Hydrologic and geochemical characterization of the Santa Rosa Plain watershed, Sonoma County, California

    USGS Publications Warehouse

    Nishikawa, Tracy

    2013-01-01

    The Santa Rosa Plain is home to approximately half of the population of Sonoma County, California, and faces growth in population and demand for water. Water managers are confronted with the challenge of meeting the increasing water demand with a combination of water sources, including local groundwater, whose future availability could be uncertain. To meet this challenge, water managers are seeking to acquire the knowledge and tools needed to understand the likely effects of future groundwater development in the Santa Rosa Plain and to identify efficient strategies for surface- and groundwater management that will ensure the long-term viability of the water supply. The U.S. Geological Survey, in cooperation with the Sonoma County Water Agency and other stakeholders in the area (cities of Cotati, Rohnert Park, Santa Rosa, and Sebastopol, town of Windsor, Cal-American Water Company, and the County of Sonoma), undertook this study to characterize the hydrology of the Santa Rosa Plain and to develop tools to better understand and manage the groundwater system. The objectives of the study are: (1) to develop an updated assessment of the hydrogeology and geochemistry of the Santa Rosa Plain; (2) to develop a fully coupled surface-water and groundwater-flow model for the Santa Rosa Plain watershed; and (3) to evaluate the potential hydrologic effects of alternative groundwater-management strategies for the basin. The purpose of this report is to describe the surface-water and groundwater hydrology, hydrogeology, and water-quality characteristics of the Santa Rosa Plain watershed and to develop a conceptual model of the hydrologic system in support of the first objective. The results from completing the second and third objectives will be described in a separate report.

  5. Hantavirus (Bunyaviridae) infections in rodents from Orange and San Diego counties, California.

    PubMed

    Bennett, S G; Webb, J P; Madon, M B; Childs, J E; Ksiazek, T G; Torrez-Martinez, N; Hjelle, B

    1999-01-01

    During a screening program to determine the extent of hantavirus activity in Orange and San Diego Counties, California, serum samples from 2,365 rodents representing nine genera and 15 species were tested for hantavirus antibodies. A reverse transcription-polymerase chain reaction on selected seropositive rodents was used to identify the specific hantavirus. Rodents positive for Sin Nombre virus (SNV) antibodies by Western blot included 86 (9.1%) of 948 deer mice (Peromyscus maniculatus), four (1.5%) of 275 California mice (Peromyscus californicus), one (0.5%) of 196 cactus mice (Peromyscus eremicus), 51 (12.2%) of 417 harvest mice (Reithrodontomys megalotis), and five (12.5%) of 40 California voles (Microtus californicus). All other specimens tested were negative for hantavirus antibodies. There was a correlation between age and sex of the reservoir host and prevalence of SNV antibody, especially among male deer mice and harvest mice. Few seasonal trends in antibody prevalence were observed and continued maintenance of SNV and El Moro Canyon virus was found at several foci over a 4-5-year period. Isla Vista virus was also found in voles and represents the first recorded in Orange County. Microhabitat selection on the part of these rodents based on plant density, plant height, and availability of food plants may explain, to some extent, all of the hantavirus-positive foci throughout the study area over a broad geographic range and the lack of antibody-positive rodents in dense chaparral, woodland, and riparian areas. The majority of rodents positive for SNV was identified from localities along coastal bluffs and the foothills of the Santa Ana Mountains, where trap success was high and P. maniculatus represented 43% of all rodents collected. Several residential, commercial, and industrial sites exist in these areas and the potential health risk should not be overlooked. This study represents an in-depth analysis of the prevalence, host distribution, and

  6. 33 CFR 80.1150 - Arcata-Humboldt Bay, CA.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Arcata-Humboldt Bay, CA. 80.1150... NAVIGATION RULES COLREGS DEMARCATION LINES Pacific Coast § 80.1150 Arcata-Humboldt Bay, CA. A line drawn from Humboldt Bay Entrance Light 4 to Humboldt Bay Entrance Light 3....

  7. 76 FR 39303 - Revisions to the California State Implementation Plan, Imperial County Air Pollution Control...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-06

    ... Pollution Control District, Kern County Air Pollution Control District, and Ventura County Air Pollution... taking direct final action to approve revisions to the Imperial County Air Pollution Control District (ICAPCD), Kern County Air Pollution Control District (KCAPCD), and Ventura County Air Pollution...

  8. 76 FR 39357 - Revisions to the California State Implementation Plan, Imperial County Air Pollution Control...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-06

    ... Pollution Control District, Kern County Air Pollution Control District, and Ventura County Air Pollution... proposing to approve revisions to the Imperial County Air Pollution Control District (ICAPCD), Kern County Air Pollution Control District (KCAPCD), and Ventura County Air Pollution Control District...

  9. Distribution and Abundance of California Giant Salamander (Dicamptodon ensatus) and Signal Crayfish (Pacifastacus leniusculus) in the Upper Redwood Creek Watershed, Marin County, California

    USGS Publications Warehouse

    Fong, Darren; Howell, Judd A.

    2006-01-01

    A survey was conducted in 1997-1998 to identify the distribution of non-native signal crayfish (Pacifastacus leniusculus) and larval California giant salamanders (Dicamptodon ensatus) within the upper Redwood Creek watershed (Marin County, California). The crayfish is widely distributed along the mainstem Redwood Creek. It was found in lower Fern Creek but not in any first order tributaries or above fish barriers. While present throughout the study area, larval California giant salamanders were found mainly in small headwater tributaries. Larval salamanders appear to use habitats in accordance to their availability, while signal crayfish were rarely found in shallow water habitats and appeared to prefer scour pools. Evidence of predation by signal crayfish on larval giant salamanders was found under confined conditions. Controlled laboratory and field experiments would be needed to determine whether competitive exclusion is occurring. Because of its widespread occurrence in the headwater streams surveyed in this project, California giant salamanders would be an appropriate indicator species for those interested in monitoring the health of small headwater streams. Future long-term monitoring using California giant salamanders should be based on permanent monitoring reaches with periodic basinwide habitat and animal surveys to determine if reaches are representative of basinwide conditions.

  10. California GAMA Program: Sources and transport of nitrate in shallow groundwater in the Llagas Basin of Santa Clara County, California

    SciTech Connect

    Moran, J E; McNab, W; Esser, B; Hudson, G; Carle, S; Beller, H; Kane, S; Tompson, A B; Letain, T; Moore, K; Eaton, G; Leif, R; Moody-Bartel, C; Singleton, M

    2005-06-29

    A critical component of the State Water Resource Control Board's Groundwater Ambient Monitoring and Assessment (GAMA) Program is to assess the major threats to groundwater resources that supply drinking water to Californians (Belitz et al., 2004). Nitrate is the most pervasive and intractable contaminant in California groundwater and is the focus of special studies under the GAMA program. This report presents results of a study of nitrate contamination in the aquifer beneath the cities of Morgan Hill and Gilroy, CA, in the Llagas Subbasin of Santa Clara County, where high nitrate levels affect several hundred private domestic wells. The main objectives of the study are: (1) to identify the main source(s) of nitrate that issue a flux to the shallow regional aquifer (2) to determine whether denitrification plays a role in the fate of nitrate in the subbasin and (3) to assess the impact that a nitrate management plan implemented by the local water agency has had on the flux of nitrate to the regional aquifer. Analyses of 56 well water samples for major anions and cations, nitrogen and oxygen isotopes of nitrate, dissolved excess nitrogen, tritium and groundwater age, and trace organic compounds, show that synthetic fertilizer is the most likely source of nitrate in highly contaminated wells, and that denitrification is not a significant process in the fate of nitrate in the subbasin except in the area of recycled water application. In addition to identifying contaminant sources, these methods offer a deeper understanding of how the severity and extent of contamination are affected by hydrogeology and groundwater management practices. In the Llagas subbasin, the nitrate problem is amplified in the shallow aquifer because it is highly vulnerable with high vertical recharge rates and rapid lateral transport, but the deeper aquifers are relatively more protected by laterally extensive aquitards. Artificial recharge delivers low-nitrate water and provides a means of long

  11. Geologic map database of the El Mirage Lake area, San Bernardino and Los Angeles Counties, California

    USGS Publications Warehouse

    Miller, David M.; Bedford, David R.

    2000-01-01

    This geologic map database for the El Mirage Lake area describes geologic materials for the dry lake, parts of the adjacent Shadow Mountains and Adobe Mountain, and much of the piedmont extending south from the lake upward toward the San Gabriel Mountains. This area lies within the western Mojave Desert of San Bernardino and Los Angeles Counties, southeastern California. The area is traversed by a few paved highways that service the community of El Mirage, and by numerous dirt roads that lead to outlying properties. An off-highway vehicle area established by the Bureau of Land Management encompasses the dry lake and much of the land north and east of the lake. The physiography of the area consists of the dry lake, flanking mud and sand flats and alluvial piedmonts, and a few sharp craggy mountains. This digital geologic map database, intended for use at 1:24,000-scale, describes and portrays the rock units and surficial deposits of the El Mirage Lake area. The map database was prepared to aid in a water-resource assessment of the area by providing surface geologic information with which deepergroundwater-bearing units may be understood. The area mapped covers the Shadow Mountains SE and parts of the Shadow Mountains, Adobe Mountain, and El Mirage 7.5-minute quadrangles. The map includes detailed geology of surface and bedrock deposits, which represent a significant update from previous bedrock geologic maps by Dibblee (1960) and Troxel and Gunderson (1970), and the surficial geologic map of Ponti and Burke (1980); it incorporates a fringe of the detailed bedrock mapping in the Shadow Mountains by Martin (1992). The map data were assembled as a digital database using ARC/INFO to enable wider applications than traditional paper-product geologic maps and to provide for efficient meshing with other digital data bases prepared by the U.S. Geological Survey's Southern California Areal Mapping Project.

  12. Mineral resources and mineral resource potential of the Panamint Dunes Wilderness Study Area, Inyo County, California

    SciTech Connect

    Kennedy, G.L.; Kilburn, J.E.; Conrad, J.E.; Leszcykowski, A.M.

    1984-01-01

    This report presents the results of a mineral survey of the Panamint Dunes Wilderness Study Area (CDCA-127), California Desert Conservation Area, Inyo County, California. The Panamint Dunes Wilderness Study Area has an identified volcanic cinder resource and few areas with mineral resource potential. Hydrothermal deposits of lead-zinc-silver occur in veins and small replacement bodies along and near the Lemoigne thrust fault on the eastern side of the wilderness study area. Two workings, the Big Four mine with 35,000 tons of inferred subeconomic lead-zinc-silver resources and a moderate potential for additional resources, and the Apple 1 claim with low potential for lead-zinc-silver resources, are surrounded by the study area but are specifically excluded from it. A low resource potential for lead-zinc-silver is assigned to other exposures along the Lemoigne thrust, although metallic minerals were not detected at these places. The Green Quartz prospect, located near the northern tip of the study area, has low resource potential for copper in quartz pegmatities in quartz monzonite of the Hunter Mountain batholith. Nonmetallic mineral resources consist of volcanic cinders and quartz sand. An estimated 900,000 tons of inferred cinder reserves are present at Cal Trans borrow pit MS 242, on the southern margin of the study area. The Panamint Valley dune field, encompassing 480 acres in the north-central part of the study area, has only low resource potential for silica because of impurities. Other sources of silica and outside the study area are of both higher purity and closer to possible markets. 19 refs., 2 figs., 1 tab.

  13. Demography of the San Francisco gartersnake in coastal San Mateo County, California

    USGS Publications Warehouse

    Halstead, Brian J.; Wylie, Glenn D.; Amarello, Melissa; Smith, Jeffrey J.; Thompson, Michelle E.; Routman, Eric J.; Casazza, Michael L.

    2011-01-01

    The San Francisco gartersnake Thamnophis sirtalis tetrataenia has been federally listed as endangered since 1967, but little demographic information exists for this species. We examined the demography of a San Francisco gartersnake population on approximately 213 ha of California coastal prairie in San Mateo County, California, from 2007 to 2010. The best-supported mark-recapture model indicated annual variation in daily capture probabilities and annual survival rates. Abundance increased throughout the study period, with a mean total population from 2008 to 2010 of 443 (95% CI = 313-646) individuals. Annual survival was slightly greater than that of most other gartersnakes, with an annual probability of survival of 0.78 (0.55-0.95) in 2008-2009 and 0.75 (0.49-0.93) in 2009-2010. Mean annual per capita recruitment rates were 0.73 (0.02-2.50) in 2008-2009 and 0.47 (0.02-1.42) in 2009-2010. From 2008 to 2010, the probability of an increase in abundance at this site was 0.873, with an estimated increase of 115 (-82 to 326) individuals. The estimated population growth rate in 2008-2009 was 1.52 (0.73-3.29) and in 2009-2010 was 1.21 (0.70-2.17). Although this population is probably stable or increasing in the short term, long-term studies of the status of the San Francisco gartersnake at other sites are required to estimate population trends and to elucidate mechanisms that promote the recovery of this charismatic member of our native herpetofauna.

  14. Cooling rates and crystallization dynamics of shallow level pegmatite-aplite dikes, San Diego County, California

    USGS Publications Warehouse

    Webber, Karen L.; Simmons, William B.; Falster, Alexander U.; Foord, Eugene E.

    1999-01-01

    Pegmatites of the Pala and Mesa Grande Pegmatite Districts, San Diego County, California are typically thin, sheet-like composite pegmatite-aplite dikes. Aplitic portions of many dikes display pronounced mineralogical layering referred to as "line rock," characterized by fine-grained, garnet-rich bands alternating with albite- and quartz-rich bands. Thermal modeling was performed for four dikes in San Diego County including the 1 m thick Himalaya dike, the 2 m thick Mission dike, the 8 m thick George Ashley dike, and the 25 m thick Stewart dike. Calculations were based on conductive cooling equations accounting for latent heat of crystallization, a melt emplacement temperature of 650 °C into 150 °C fractured, gabbroic country rock at a depth of 5 km, and an estimated 3 wt% initial H2O content in the melt. Cooling to -5 cm/s. Crystal size distribution (CSD) studies of garnet from layered aplites suggest growth rates of about 10-6 cm/s. These results indicate that the dikes cooled and crystallized rapidly, with variable nucleation rates but high overall crystal-growth rates. Initial high nucleation rates coincident with emplacement and strong undercooling can account for the millimeter-size aplite grains. Lower nucleation rates coupled with high growth rates can explain the decimeter-size minerals in the hanging walls, cores, and miarolitic cavities of the pegmatites. The presence of tourmaline and/or lepidolite throughout these dikes suggests that although the melts were initially H2O-undersaturated, high melt concentrations of incompatible (or fluxing) components such as B, F, and Li (±H2O), aided in the development of large pegmatitic crystals that grew rapidly in the short times suggested by the conductive cooling models.

  15. Rice burning and asthma hospitalizations, Butte County, California, 1983-1992.

    PubMed Central

    Jacobs, J; Kreutzer, R; Smith, D

    1997-01-01

    We investigated the association between rice burning and daily asthma hospitalizations in Butte County, California, from 1983 to 1992. Eighty-two percent of planted rice was burned, with a mean of 555 acres burned on days when burning was permitted. For 60% of the days during this period, no rice burning occurred. Peak burning occurred in fall and spring but was not correlated with criteria pollutants. Asthma admissions averaged 0.65/day and peaked in March. In the basic Poisson model with daily asthma hospitalizations as the outcome of interest, burn acreage showed a small but statistically significant elevation of risk for hospitalization per acre of rice burned [relative risk (RR) = 1.0001; 95% confidence interval (CI), 1. 00004-1.0002], after adjusting for maximum daily temperature, seasonal factors, and yearly population. In this model, burn acreage showed a dose-response effect as acreage burned increased. Days with the greatest acreage burned (>499 acres) had the largest risk of hospitalization (RR = 1.23; CI, 1.09-1.39), and days with moderate burning (between 100 and 499 acres) had a slightly lower risk of admission (RR = 1.2; CI, 1.05-1.37). Elevations of air pollutants were not associated with days of increased rice burning; however, rice burn acreage was shown to have a small but statistically significant effect on asthma morbidity in Butte County. This evidence suggests that further limitations on the daily amount of rice straw permitted to be burned should be considered to reduce pulmonary morbidity related to asthma. Images Figure 1. Figure 2. PMID:9300924

  16. Geologic Map and Map Database of Eastern Sonoma and Western Napa Counties, California

    USGS Publications Warehouse

    Graymer, R.W.; Brabb, E.E.; Jones, D.L.; Barnes, J.; Nicholson, R.S.; Stamski, R.E.

    2007-01-01

    Introduction This report contains a new 1:100,000-scale geologic map, derived from a set of geologic map databases (Arc-Info coverages) containing information at 1:62,500-scale resolution, and a new description of the geologic map units and structural relations in the map area. Prepared as part of the San Francisco Bay Region Mapping Project, the study area includes the north-central part of the San Francisco Bay region, and forms the final piece of the effort to generate new, digital geologic maps and map databases for an area which includes Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, Santa Cruz, Solano, and Sonoma Counties. Geologic mapping in Lake County in the north-central part of the map extent was not within the scope of the Project. The map and map database integrates both previously published reports and new geologic mapping and field checking by the authors (see Sources of Data index map on the map sheet or the Arc-Info coverage eswn-so and the textfile eswn-so.txt). This report contains new ideas about the geologic structures in the map area, including the active San Andreas Fault system, as well as the geologic units and their relations. Together, the map (or map database) and the unit descriptions in this report describe the composition, distribution, and orientation of geologic materials and structures within the study area at regional scale. Regional geologic information is important for analysis of earthquake shaking, liquifaction susceptibility, landslide susceptibility, engineering materials properties, mineral resources and hazards, as well as groundwater resources and hazards. These data also assist in answering questions about the geologic history and development of the California Coast Ranges.

  17. The Role of Women in Farming: An Exploratory Study of the Relative Impact Women Have on the Farm Enterprise in Yolo County, California.

    ERIC Educational Resources Information Center

    Gwynn, Douglas; And Others

    The purpose of this pilot study was to describe the participation of farm women in farm work in one California country. Women from 228 farms, approximately 55 percent of the farms in Yolo County, California, were interviewed by telephone concerning their efforts and roles on the family farm. The study found that the main criterion of whether or…

  18. Environmental assessment and finding of no significant impact: Biorecycling Technologies, Inc., Noble Biogas and Fertilizer Plant, Fresno County, California

    SciTech Connect

    1997-09-01

    The US Department of Energy (DOE) is considering a proposal from the California Energy Commission for partial funding up to $1,500,000 of the construction of the biorecycling Technologies, Inc., (BTI) Noble Biogas and Fertilizer Plant in Fresno County, California. BTI along with its contractors and business partners would develop the plant, which would use manure and green waste to produce biogas and a variety of organic fertilizer products. The California Energy Commission has requested funding from the DOE Commercialization Ventures program to assist in the construction of the plant, which would produce up to one megawatt of electricity by burning biogas in a cogeneration unit. The purpose of this environmental assessment (EA) is to provide DOE and the public with information on potential environmental impacts associated with funding development of the proposed project.

  19. Limited Life Opportunities for Black and Latino Youth. Report on a Public Hearing by the Los Angeles County Commission on Human Relations (Compton, California, April 26, 1990).

    ERIC Educational Resources Information Center

    Los Angeles County Commission on Human Relations, CA.

    The Los Angeles County Commission on Human Relations held a public hearing to examine the effects of poverty on the hundreds of thousands of low income Blacks and Latinos under the age of 18 residing in Los Angeles County (California). The Commission's findings, recommendations, and concerns are presented. The following findings are presented: (1)…

  20. High-resolution topographic, bathymetric, and oceanographic data for the Pleasure Point Area, Santa Cruz County, California: 2005-2007

    USGS Publications Warehouse

    Storlazzi, Curt D.; Barnard, Patrick L.; Collins, Brian D.; Finlayson, David P.; Golden, Nadine E.; Hatcher, Gerry A.; Kayen, Robert E.; Ruggiero, Peter

    2007-01-01

    The County of Santa Cruz Department of Public Works and the County of Santa Cruz Redevelopment Agency requested the U.S. Geological Survey (USGS) Western Coastal and Marine Geology Team (WCMG) to provide baseline geologic and oceanographic information on the coast and inner shelf at Pleasure Point, Santa Cruz County, California. The rationale for this proposed work is a need to better understand the environmental consequences of a proposed bluff stabilization project on the beach, the nearshore and the surf at Pleasure Point, Santa Cruz County, California. To meet these information needs, the USGS-WCMG Team collected baseline scientific information on the morphology and waves at Pleasure Point. This study provided high-resolution topography of the coastal bluffs and bathymetry of the inner shelf off East Cliff Drive between 32nd Avenue and 41st Avenue. The spatial and temporal variation in waves and their breaking patterns at the study site were documented. Although this project did not actively investigate the impacts of the proposed bluff stabilization project, these data provide the baseline information required for future studies directed toward predicting the impacts of stabilization on the sea cliffs, beach and nearshore sediment profiles, natural rock reef structures, and offshore habitats and resources. They also provide a basis for calculating potential changes to wave transformations into the shore at Pleasure Point.

  1. Preliminary evaluation of the potential for artificial ground-water recharge in eastern San Joaquin County, California

    USGS Publications Warehouse

    Mitten, H.T.

    1982-01-01

    In response to increasing demand on water supplies and declining water levels in San Joaquin County, the U. S. Geological Survey, in cooperation with the San Joaquin County Flood Control and Water Conservation District, is evaluating the potential for artificially recharging the aquifer system in eastern San Joaquin County, California. Through a well canvass and analyses of existing data on geology, soils, and drillers logs, this study (phase one of three phases) resulted in identification of 20 sites for exploratory test drilling in areas potentially favorable for artificial recharge. Ten of the sites are in areas adjacent to the Mokelumne River, six are in areas adjacent to the Calaveras River and Mormon Slough, and four are north of Littlejohns Creek. (USGS)

  2. Water resources of the Santa Rosa Indian Reservation and vicinity, Riverside County, California

    USGS Publications Warehouse

    Buono, Anthony; Moyle, W.R.; Dana, Patricia

    1979-01-01

    Additional water for irrigation is needed by the Santa Rosa Indian Reservation, Riverside County, California. Water in the area is derived from precipitation, which averages 12 inches annually, on three subbasins nearly surrounding the 17-square-mile reservation. No ground water flows in from outside the area. A supply well that taps sandy material overlying the pre-Tertiary basement complex showed a specific capacity of 0.4 gallon per minute per foot of drawdown. Estimates of specific yield for material encountered during drilling of three wells and a test hole ranged from 5 to 10 percent. A gravity survey outlined the thickest section of the aquifer in the Vandeventer Flat area, and test wells are proposed to determine its potential well yield. Damming streams to retain runoff (about 1,500 acre-feet per year, and more during periods of heavy precipitation) is also proposed. Analyses of water from the supply well and five major springs showed that ground water is suitable for irrigation except at Sulphur Spring, where the percent sodium of 97 exceeds recommended maximums, and at Bull Canyon Spring, where the specific conductance of 1,300 micromhos indicate a salinity hazard. (Kosco-USGS)

  3. Intersections of family homelessness, CPS involvement, and race in Alameda County, California.

    PubMed

    Rodriguez, Jason M; Shinn, Marybeth

    2016-07-01

    The homelessness and child protective services (CPS) systems are closely linked. This study examines the patterns and sequence of families' involvement with homeless shelters and CPS, as well as whether involvement in each system predicts involvement in the other using linked administrative records for 258 families recruited in emergency shelters in Alameda County, California. More than half of families were reported to CPS at some point, but less than one-fifth ever had a report substantiated. Reports that were uninvestigated or unfounded increased in the months leading up to shelter entry and spiked immediately afterward, but substantiations and child removals increased only later. Shelter use before study entry was associated with CPS referrals and investigations after study entry, although not with substantiated cases or child removals. However, CPS involvement before study entry was not associated with returns to shelter after study entry. These results imply that an unsubstantiated report of neglect or abuse may serve as an early warning signal for homelessness and that preventive strategies aiming to affect both homeless and child protective systems should focus on reducing homelessness. CPS workers should evaluate families' housing needs and attempt to link families to appropriate resources. Black families were disproportionately referred to CPS after shelter entry after controlling for other family characteristics, but race was not associated with substantiations of neglect or abuse or with child removals. Findings lend modest support to human decision-making and institutional explanations of racial disproportionalities in CPS involvement, especially for reporters outside of the CPS system. PMID:27318034

  4. Problems related to water quality and algal control in Lopez Reservoir, San Luis Obispo County, California

    USGS Publications Warehouse

    Fuller, Richard H.; Averett, Robert C.; Hines, Walter G.

    1975-01-01

    A study to determine the present enrichment status of Liopez Reservoir in San Luis Obispo county, California, and to evaluate copper sulfate algal treatment found that stratification in the reservoir regulates nutrient release and that algal control has been ineffective. Nuisance algal blooms, particularly from March to June, have been a problem in the warm multipurpose reservoir since it was initially filled following intense storms in 1968-69. The cyanophyte Anabaena unispora has been dominant; cospecies are the diatoms Stephanodiscus astraea and Cyclotella operculata, and the chlorophytes Pediastrum deplex and Sphaerocystis schroeteri. During an A. unispora bloom in May 1972 the total lake surface cell count was nearly 100,000 cells/ml. Thermal stratification from late spring through autumn results in oxygen deficiency in the hypolimnion and metalimnion caused by bacterial oxidation of organic detritus. The anaerobic conditions favor chemical reduction of organic matter, which constitute 10-14% of the sediment. As algae die, sink to the bottom, and decompose, nutrients are released to the hypolimnion , and with the autumn overturn are spread to the epilimnion. Algal blooms not only hamper recreation, but through depletion of dissolved oxygen in the epilimnion may have caused periodic fishkills. Copper sulfate mixed with sodium citrate and applied at 1.10-1.73 lbs/acre has not significantly reduced algal growth; a method for determining correct dosage is presented. (Lynch-Wisconsin)

  5. Adverse pregnancy outcomes in relation to water contamination, Santa Clara County, California, 1980-1981

    SciTech Connect

    Deane, M.; Swan, S.H.; Harris, J.A.; Epstein, D.M.; Neutra, R.R.

    1989-05-01

    An epidemiologic study was conducted to investigate a suspected cluster of adverse outcomes of pregnancies conceived in 1980-1981 among women who resided in a census tract in Santa Clara County, California that was thought to be exposed to drinking water from a well contaminated by an organic solvent, trichloroethane. A comparison census tract that received water from a different source was selected on the basis of demographic comparability. The cluster was confirmed; the odds ratio for spontaneous abortion was 2.3 (95% confidence interval (Cl) 1.3-4.2) after adjustment by multiple logistic regression for maternal risk factors, including maternal age, alcohol consumption, smoking, and prior fetal loss. The relative risk for congenital malformations was 3.1 (95% Cl 1.1-10.4). Because of the lack of precise information on the timing and extent of contamination, the pattern of spontaneous abortion rates throughout the study period cannot be used to either support or refute a causal inference.

  6. Near-conservative behavior of 129Iodine in the Orange County Aquifer System, California

    SciTech Connect

    Schwer, K A; Santschi, P H; Moran, J E; Elmore, D

    2005-01-21

    Iodine is a biophilic element, with one stable isotope, {sup 127}I, and one long-lived radioisotope, {sup 129}I, which originates in the surface environment almost entirely from anthropogenic activities such as nuclear fuel reprocessing. Very few studies have evaluated the geochemical behavior of iodine isotopes in the subsurface. The concentrations of {sup 129}I and {sup 127}I were measured in wells fed by a series of artificial recharge ponds in the Forebay Area of the Orange County groundwater basin (California, USA) to evaluate their potential use as hydrological tracers. To substantiate interpretation of {sup 129}I and {sup 127}I concentration data, the aquifer system was evaluated using literature values of aquifer water mass age based on {sup 3}H/{sup 3}He, Xenon and {delta}{sup 18}O tracer data, as well as time-series data of Santa Ana River flow rates over the past decade. The aquifer data demonstrate the nearly conservative behavior of {sup 129}I, with {sup 129}I/{sup 127}I ratios likely reflecting variations in source functions as well as climatic conditions, and with inferred particle-water partition coefficients (K{sub d}) of 0.1 cm{sup 3} g{sup -1} or less.

  7. Seastacks buried beneath newly reported Lower Miocene sandstone, northern Santa Barbara County, California

    SciTech Connect

    Fritsche, A.E.; Hanna, F.M.

    1985-04-01

    Three large, isolated exposures of a light-gray, coarse-grained, thick-bedded sandstone unit occur in the northern San Rafael Mountains of Santa Barbara County, California. These rocks are moderately fossiliferous and contain Vertipecten bowersi, Amussiopecten vanvlecki, Aequipecten andersoni, Otrea howelli, shark teeth, whale bones, and regular echinoid spines. The fossils indicate that the sandstone unit, although previously reported as upper(.) Miocene, correlates best with the lower Miocene Vaqueros Formation. This unit was deposited in angular unconformity on a Cretaceous, greenish-gray turbidite sequence of interbedded sandstone and shale, and onlaps the unconformity erosion surface from west to east, the unit being thicker in the west and older at its base. The underlying Cretaceous sandstone beds are well indurated, and during the eastward transgression of the early Miocene sea, they resisted wave erosion and stood as seastacks offshore of the advancing coastline, thus creating a very irregular topographic surface upon which the Vaqueros Formation was deposited. Some seastacks were as much as 4 m tall, as indicated by inliers of Cretaceous rock surrounded by 4-m thick sections of the Vaqueros Formation.

  8. Acid mine drainage on public and private lands, the Walker Mine experience, Plumas County, California

    SciTech Connect

    Croyle, W.A.; Rosenbaum, S.E.

    1996-11-01

    A widespread environmental problem associated with abandoned mines and their tailings is acid mine drainage (AMD). AMID typically has low pH and elevated metal concentrations that are toxic to aquatic life. In Northern California, Iron Mountain and other mines in the Shasta mining districts are the largest sources of AMD. Additional sources lie to the south along a discontinuous belt of copper and zinc mineralization in the western Sierra foothills. Between these areas lies a remote group of copper mines in northeastern Plumas County including the Walker, Engels and Superior mines. Of this group, AMD from Walker Mine has caused the most severe water quality impairment. This paper describes the history and environmental setting of Walker Mine and the approaches used by the Central Valley Regional Water Quality Control Board, a state regulatory agency, to improve water quality at the site. Both the mine and its tailings contribute pollutants to the watershed. The mine has a portal discharge with depressed pH and high copper concentrations. The tailings add fine grained sediment to the creek and generate low but significant concentrations of dissolved copper. The mine is on private property and the tailings are on land managed by the U. S. Forest Service. Because of these differences in pollution problems and ownership, the methods employed by the Regional Board to improve conditions at the mine and tailings have been on different, but parallel tracks. Monitoring shows these efforts have significantly improved water quality in the watershed over the last 10 years.

  9. Mineral resource potential map of the John Muir Wilderness, Fresno, Inyo, Madera, and Mono counties, California

    USGS Publications Warehouse

    Du Bray, E.A.; Dellinger, D.A.; Diggles, M.F.; Oliver, H.W.; Johnson, F.L.; Thurber, H.K.; Morris, R.W.; Perers, T.J.; Lindsey, D.S.

    1982-01-01

    Under the provisions of the Wilderness Act (Public Law 88-577, September 3, 1964) and the Joint Conference Report on Senate Bill 4, 88th Congress, the U.S. Geological Survey and the U.S. Bureau of Mines have been conducting mineral surveys of wilderness and primitive areas. Areas officially designated as "wilderness," "wild," or "canoe" when the act was passed were incorporated into the National Wilderness Preservation System, and some of them are presently being studied. The act provided that areas under consideration for wilderness designation should be studied for suitability for incorporation into the Wilderness System. The mineral surveys constitute one aspect of the suitability studies. The act directs that the results of such surveys are to be made available to the public and be submitted to the President and the Congress. This report discusses the results of a mineral survey of the John Muir Wilderness, Inyo and Sierra National Forests, Fresno, lnyo, Madera, and Mono Counties, California. The area was established as a wilderness by Public Law 88-577, September 3, 1964.

  10. Geology of epithermal silver-gold bulk-mining targets, bodie district, Mono County, California

    USGS Publications Warehouse

    Hollister, V.F.; Silberman, M.L.

    1995-01-01

    The Bodie mining district in Mono County, California, is zoned with a core polymetallic-quartz vein system and silver- and gold-bearing quartz-adularia veins north and south of the core. The veins formed as a result of repeated normal faulting during doming shortly after extrusion of felsic flows and tuffs, and the magmatic-hydrothermal event seems to span at least 2 Ma. Epithermal mineralization accompanied repeated movement of the normal faults, resulting in vein development in the planes of the faults. The veins occur in a very large area of argillic alteration. Individual mineralized structures commonly formed new fracture planes during separate fault movements, with resulting broad zones of veinlets growing in the walls of the major vein-faults. The veinlet swarms have been found to constitute a target estimated at 75,000,000 tons, averaging 0.037 ounce gold per ton. The target is amenable to bulkmining exploitation. The epithermal mineralogy is simple, with electrum being the most important precious metal mineral. The host veins are typical low-sulfide banded epithermal quartz and adularia structures that filled voids created by the faulting. Historical data show that beneficiation of the simple vein mineralogy is very efficient. ?? 1995 Oxford University Press.

  11. L-band radar sensing of soil moisture. [Kern County, California

    NASA Technical Reports Server (NTRS)

    Chang, A. T. C.; Atwater, S.; Salomonson, V. V.; Estes, J. E.; Simonett, D. S.; Bryan, M. L.

    1980-01-01

    The performance of an L-band, 25 cm wavelength imaging synthetic aperture radar was assessed for soil moisture determination, and the temporal variability of radar returns from a number of agricultural fields was studied. A series of three overflights was accomplished over an agricultural test site in Kern County, California. Soil moisture samples were collected from bare fields at nine sites at depths of 0-2, 2-5, 5-15, and 15-30 cm. These gravimetric measurements were converted to percent of field capacity for correlation to the radar return signal. The initial signal film was optically correlated and scanned to produce image data numbers. These numbers were then converted to relative return power by linear interpolation of the noise power wedge which was introduced in 5 dB steps into the original signal film before and after each data run. Results of correlations between the relative return power and percent of field capacity (FC) demonstrate that the relative return power from this imaging radar system is responsive to the amount of soil moisture in bare fields. The signal returned from dry (15% FC) and wet (130% FC) fields where furrowing is parallel to the radar beam differs by about 10 dB.

  12. Comments on potential geologic and seismic hazards affecting coastal Ventura County, California

    USGS Publications Warehouse

    Ross, Stephanie L.; Boore, David M.; Fisher, Michael A.; Frankel, Arthur D.; Geist, Eric L.; Hudnut, Kenneth W.; Kayen, Robert E.; Lee, Homa J.; Normark, William R.; Wong, Florence L.

    2004-01-01

    This report examines the regional seismic and geologic hazards that could affect proposed liquefied natural gas (LNG) facilities in coastal Ventura County, California. Faults throughout this area are thought to be capable of producing earthquakes of magnitude 6.5 to 7.5, which could produce surface fault offsets of as much as 15 feet. Many of these faults are sufficiently well understood to be included in the current generation of the National Seismic Hazard Maps; others may become candidates for inclusion in future revisions as research proceeds. Strong shaking is the primary hazard that causes damage from earthquakes and this area is zoned with a high level of shaking hazard. The estimated probability of a magnitude 6.5 or larger earthquake (comparable in size to the 2003 San Simeon quake) occurring in the next 30 years within 30 miles of Platform Grace is 50-60%; for Cabrillo Port, the estimate is a 35% likelihood. Combining these probabilities of earthquake occurrence with relationships that give expected ground motions yields the estimated seismic-shaking hazard. In parts of the project area, the estimated shaking hazard is as high as along the San Andreas Fault. The combination of long-period basin waves and LNG installations with large long-period resonances potentially increases this hazard.

  13. Drug-resistant pulmonary tuberculosis in the Baja California-San Diego County border population.

    PubMed

    Peter, C R; Schultz, E; Moser, K; Cox, M; Freeman, R; Ramirez-Zetina, M; Lomeli, M R

    1998-10-01

    A study was conducted to determine the frequency of, and risk factors for, drug-resistant pulmonary tuberculosis (TB) among Baja California (BC) and San Diego County (SDC) residents. Another purpose was to document the amount of contact between pulmonary TB patients and residents of the opposite side of the the border. During the period from February 1995 to May 1996, pulmonary TB patients from BC (n = 427) and SDC (n = 331) were evaluated with cultures, drug susceptibility tests, and questionnaires. Drug resistance was found in 41% of the BC Mycobacterium tuberculosis complex (MTB) isolates and 20% of the SDC isolates. Resistance to both isoniazid (INH) and rifampin (RIF) varied from 1% of isolates from SDC patients to 17% of isolates from BC patients. Patients with a history of previous treatment had increased odds of drug-resistant disease. Older BC patients were more likely to have INH- or RIF-resistant TB. Although 42% of Tijuana TB patients reported recent contact with residents from SDC, travel to Mexico and contact with residents from Mexico were not significant risk factors for drug-resistant TB among SDC residents. However, the demonstrated contact between TB patients and residents on opposite sides of the border indicates the importance of coordinating efforts internationally to control TB. PMID:9795580

  14. Gene Flow Patterns of the Mayfly Fallceon quilleri in San Diego County, California.

    NASA Astrophysics Data System (ADS)

    Zickovich, J.; Bohonak, A. J.

    2005-05-01

    Management decisions and conservation strategies for freshwater invertebrates critically depend on an understanding of gene flow and genetic structure. We collected the mayfly Fallceon quilleri (Ephemeroptera: Baetidae) from 15 streams across three geographically distinct watersheds in San Diego County, California (San Dieguito, Santa Margarita, and Tijuana) and one site in Anza-Borrego desert. We sequenced a 667 base pair region of the mitochondrial DNA (COI) to assess genetic structure and gene flow. We found eight haplotypes across all populations. San Dieguito and Santa Margarita each contained six haplotypes. Tijuana and Anza Borrego each contained four haplotypes. The expected heterozygosity for San Dieguito, Santa Margarita, Tijuana, and Anza Borrego was 0.81, 0.83, 0.75, and 1.0, respectively. A hierarchical AMOVA analysis indicated restricted gene flow and a pairwise comparison indicated that Tijuana watershed differs significantly from San Dieguito and Anza Borrego. A haplotype cladogram revealed two internal ancestral haplotypes and six derived tip haplotypes that are unique to particular watersheds. These results suggest that Tijuana (the southernmost and the most impacted watershed) is more genetically distinct and isolated than the other watersheds sampled.

  15. Ground water in the Twenty-Nine Palms Indian Reservation and vicinity, San Bernardino County, California

    USGS Publications Warehouse

    Freckleton, J.R.

    1982-01-01

    The Twenty-Nine Palms Indian Reservation is in San Bernardino County, California. Movement of ground water in the area is impeded locally by faults which act as ground-water barriers. There are indications that a fault probably crosses the reservation in an east-west direction; such a fault may interfere with ground-water pumping. The water-table altitude near the northern boundary of the reservation is estimated to be 120 to 130 feet below land surface datum; the aquifer thickness in the area is unknown. Pumping-test results for wells near the reservation show specific capacities ranging from 9.2 to 70.0 gallons per minute per foot of drawdown. Wells drilled on the reservation would probably fall within this range. Sodium concentrations, which may pose a hazard to those who must restrict its intake, and excessive fluoride are present in water samples from wells near the reservation. High sodium and fluoride concentrations are probably present in water in the saturated material underlying the reservation. (USGS)

  16. Effects of bank storage and well pumping on base flow, Carmel River, Monterey County, California

    NASA Astrophysics Data System (ADS)

    Kondolf, G. M.; Maloney, L. M.; Williams, J. G.

    1987-06-01

    Bank storage contributions to base flow may be important on alluvial rivers with highly permeable bank materials, such as the lower Carmel River, Monterey County, California. The recharge phase of bank storage occurs during flood stage in the river when a hydraulic gradient exists from the river into the banks. In general, discharge from bank storage is most important on the recession limb of individual floods, with most stored water typically being discharged within 2-3 flood periods. As the river stage continues to fall, a hydraulic gradient from the banks to the river will be maintained and stored water will drain from the banks. On the Carmel River, the seasonal recession limb provides conditions of a gradually declining stage over several months. In 1982, a moderately wet year, bank storage contributions were detected two months after the last peak flow of the winter rainy season, during a period of critical importance to steelhead trout and probably to riparian vegetation. However, in 1983, an extremely wet year, bank storage was undetectable two months after the season's last peak flow, probably because the sustained base flow from the upper basin overwhelmed the more transient bank storage contribution. Groundwater withdrawal from the alluvial aquifer locally lowered the water table so that streamflow was influent to the banks in the reach of major pumping wells. This effect was striking in its persistence, whether the Carmel River was gaining or losing overall in its alluvial reach. Pumping rates were roughly comparable to flow losses across the well field.

  17. Biological survey of Naval Petroleum Reserve No. 2 (Buena Vista), Kern County, California

    SciTech Connect

    O'Farrell, T.P.; Sauls, M.L.

    1987-06-01

    A field survey of Naval Petroleum Reserve No. 2, Kern County, California, was conducted to determine the distribution and relative abundance of endangered species and other wildlife. Of the 343 San Joaquin kit fox dens found in 40 sections, 33 were observed by surveyors in transit and 310 were found along transects. Of the latter, 264 were typical subterranean dens and 46 were atypical dens in man-made structures. Estimated density of dens was 28.8 +- 4.4 per square mile; relative density was 9.2/1000 acres. The number of typical dens observed per section was inversely correlated with the number of petroleum wells per section (intensity of development). Atypical dens were usually found to be in pipes or pipe culverts and were positively correlated with density of wells. Relative densities of black-tailed jackrabbits (41.9/1000 acres) and desert cottontails (17.1/1000 acres), preferred prey for foxes, were high compared with densities reported on other public lands. Most (81%) of the 19 blunt-nosed leopard lizards were observed in six adjacent sections located in the gentle foothills near Buena Vista Lake playa. Most (86%) of the 275 giant kangaroo rat burrow systems were observed in ten sections containing flat, relatively undeveloped terrain in and around upper Buena Vista Valley. San Joaquin antelope ground squirrels were the second most commonly observed diurnal vertebrate: 761 observations in 45 sections. A total of 6740 observations of 61 species of wildlife were made.

  18. Documentation and description of the digital spatial data base for southern California Regional Aquifer-System Analysis Program, Santa Clara-Calleguas Basin, Ventura County, California

    USGS Publications Warehouse

    Predmore, Steven K.; Koczot, Kathryn M.; Paybins, Katherine S.

    1997-01-01

    This report documents the geographic information system map layers and data files generated for the Santa Clara-Calleguas Basin, Ventura County, as part of a Regional Aquifer- System Analysis of southern California from 1989 to 1995. Thirty-six map layers and four data files are maintained in this geographic information system data base. The map layers cover the Santa Clara-Calleguas drainage basin and are stored in a common map projection. Attributes of the map layers and data files are described and referenced. The map layers are grouped by geography, geology, and hydrology.

  19. Geoenvironmental Investigations of the Humboldt River Basin, Northern Nevada

    USGS Publications Warehouse

    Stillings, Lisa L.

    2003-01-01

    Northern Nevada is one of the world's foremost regions of gold production. The Humboldt River Basin (HRB) covers 43,500 km2 in northern Nevada (Crompton, 1995), and it is home to approximately 18 active gold and silver mines (Driesner and Coyner, 2001) among at least 55 significant metallic mineral deposits (Long and others, 1998). Many of the gold mines are along the Carlin trend in the east-central portion of the HRB, and together they have produced 50 million ounces of gold from 1962 (when the Carlin mine first opened) through April 2002 (Nevada Mining Association, 2002). Mining is not new to the region, however. Beginning in 1849, mining has taken place in numerous districts that cover 39 percent of the land area in the HRB (Tingley, 1998). In addition to gold and silver, As, Ba, Cu, Fe, Hg, Li, Mn, Mo, Pb, S, Sb, V, W, Zn, and industrial commodities such as barite, limestone, fluorite, sand and gravel, gypsum, gemstones, pumice, zeolites, and building stone, have been extracted from the HRB (McFaul and others, 2000). All papers within this series of investigations can be found as lettered chapters of USGS Bulletin 2210, Geoenvironmental Investigations of the Humboldt River Basin, Northern Nevada. Each chapter is available separately online. The data and software utilized in this product (Chapter F) permit the user to view and analyze the geographic relationships among chemistry of stream sediments and surface waters, geology, and various cartographic base information such as but not limited to cities, county boundaries, and land ownership. Data for this product were compiled and or produced as part of a mineral and environmental assessment of the Humboldt River basin conducted by the U.S. Geological Survey between 1995 - 2000.

  20. Improving planting stock quality: The humboldt experience. Forest Service general technical report (Final)

    SciTech Connect

    Jenkinson, J.L.; Nelson, J.A.; Huddleston, M.E.

    1993-05-01

    A seedling testing program was developed to improve the survival and growth potential of planting stock produced in the USDA Forest Service Humboldt Nursery, situated on the Pacific Coast in northern California. Coastal and inland seed sources of Douglas-fir and eight other conifers in the Pacific Slope forests of western Oregon and northern California were assessed in both nursery and field studies. Seedling top and root growth capacities were evaluated just after lifting and after cold storage, and stored seedlings were tested for suvival and growth on cleared planting sites in the seed zones of origin. Safe lifting and cold storage schedules were defined, and seedling cultural regimes were formulated to produce successful 1-0, 1-1, and 2-0 stock types. Testing deomonstrated the critical elements of reforestation and proved that rapid establishment is attainable on diverse sites. Accomplishments of the Humboldt program recommended similar programs for other forest nurseries and their service regions.

  1. 78 FR 41390 - Pershing County Water Conservation District; Notice of Application Tendered for Filing with the...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-07-10

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Pershing County Water Conservation District; Notice of Application Tendered...: Pershing County Water Conservation District. e. Name of Project: Humboldt River Hydro Power Project....

  2. Channel Incision and Suspended Sediment Delivery at Caspar Creek, Mendocino County, California.

    NASA Astrophysics Data System (ADS)

    Dewey, N. J.; Lisle, T. E.; Reid, L. M.

    2003-12-01

    Tributary and headwater valleys in the Caspar Creek watershed, in coastal Mendocino County, California, show signs of incision along much of their lengths. An episode of incision followed initial-entry logging which took place between 1860 and 1906. Another episode of incision cut into skid-trails created for second-entry logging in the 1970's. Gullies resulting from both of these episodes of incision are sensitive to hydrologic fluctuations and feature active headcuts, deepening plungepools, and unstable banks, which continue to contribute sediment to the Caspar Creek channel network. Headcuts are numerous in each channel. In some cases headcuts define the upstream extent of an incised reach; in many cases headcuts migrate up previously incised reaches, increasing the depth of incision. Surveys indicate that bank retreat, plunge pool deepening, and headcut retreat all contributed sediment to the channels between 2000 and 2003. Since bank walls have considerably more surface area than headwalls per given length of channel, and headcuts have largely migrated into positions temporarily constrained by resistant lips, bankwall retreat appears to be a more significant chronic source of sediment than headwall retreat. Stream gage records show that some channels consistently deliver higher levels of suspended sediment than others. In comparing channels, ongoing levels of suspended sediment delivery correlate well with total amount of exposed channel bank (depth of incision integrated over length of channel) in the reaches upstream of stream gages. On an annual to decadal time-scale, rates of suspended sediment delivery per unit area of catchment correlate better with the amount of exposed bank area in reaches upstream of stream gages, than with the volume of sediment delivered by landslide events, with total catchment area, or with peak storm flow per unit area. The correlation between amount of exposed bank area and ongoing levels of suspended sediment delivery is

  3. Geochemical imaging of flow near an artificial recharge facility, Orange County, California.

    PubMed

    Clark, Jordan F; Hudson, G Bryant; Davisson, M Lee; Woodside, Greg; Herndon, Roy

    2004-01-01

    Critical for the management of artificial recharge operations is detailed knowledge of ground water dynamics near spreading areas. Geochemical tracer techniques including stable isotopes of water, tritium/helium-3 (T/3He) dating, and deliberate gas tracer experiments are ideally suited for these investigations. These tracers were used to evaluate flow near an artificial recharge site in northern Orange County, California, where approximately 2.5 x 10(8) m3 (200,000 acre-feet) of water are recharged annually. T/3He ages show that most of the relatively shallow ground water within 3 km of the recharge facilities have apparent ages < 2 years; further downgradient apparent ages increase, reaching > 20 years at approximately 6 km. Gas tracer experiments using sulfur hexafluoride and xenon isotopes were conducted from the Santa Ana River and two spreading basins. These tracers were followed in the ground water for more than two years, allowing subsurface flow patterns and flow times to be quantified. Results demonstrate that mean horizontal ground water velocities range from < 1 to > 4 km/year. The leading edges of the tracer patch moved at velocities about twice as fast as the center of mass. Leading edge velocities are important when considering the potential transport of microbes and other "time sensitive" contaminants and cannot be determined easily with other methods. T/3He apparent ages and tracer travel times agreed within the analytical uncertainty at 16 of 19 narrow screened monitoring wells. By combining these techniques, ground water flow was imaged with time scales on the order of weeks to decades. PMID:15035582

  4. A vapor-dominated reservoir exceeding 600{degrees}F at the Geysers, Sonoma County, California

    SciTech Connect

    Walters, M.A.; Sternfeld, J.N.; Haizlip, J.R.; Drenick, A.F.; Combs, Jim

    1988-01-01

    A high-temperature vapor-dominated reservoir underlies a portion of the Northwest Geysers area, Sonoma County, California. The high-temperature reservoir (HTR) is defined by flowing fluid temperatures exceeding 500º F, rock temperatures apparently exceeding 600º F and steam enthalpies of about 1320 BTU/lb. Steam from existing wells drilled in the Northwest Geysers is produced from both a “typical” Geysers reservoir and the HTR. In all cases, the HTR is in the lower portion of the wells and is overlain by a “typical” Geysers reservoir. Depth to the high-temperature reservoir is relatively uniform at about -5900 ft subsea. There are no identified lithologic or mineralogic conditions that separate the HTR from the “typical” reservoir, although the two reservoirs are vertically distinct and can be located in most wells to within about 200 ft by the use of downhole temperature-depth measurements. Gas concentrations in steam from the HTR are higher (6 to 9 wt %) than from the “typical” Geysers reservoir (0.85 to 2.6 wt %). Steam from the HTR is enriched in chloride and the heavy isotopes of water relative to the “typical” reservoir. Available static and dynamic measurements show pressures are subhydrostatic in both reservoirs with no anomalous differences between the two: the HTR pressure being near 520 psia at sea level datum. The small observed differences in pressure between the reservoirs appear to vary along a steam density gradient. It is postulated that the Northwest Geysers area evolved more slowly toward vapor-dominated conditions than other parts of The Geysers field because of its poor connection with the surface. In this paper, a model is presented in which the boundary between the HTR and “typical” reservoir is a thermodynamic feature only, resulting from recent deep venting of a liquid-dominated system in which conduction is still an important component of heat transfer.

  5. Deformation near the Coyote Creek fault, Imperial County, California: Tectonic or groundwater-related?

    NASA Astrophysics Data System (ADS)

    Mellors, Robert J.; Boisvert, Alex

    2003-02-01

    Interferometric synthetic aperture radar (InSAR) measurements show a consistent, 40-km2 wedge-shaped area of deformation partially bounded by a branch of the Coyote Creek fault (a southern extension of the San Jacinto fault) in Imperial County, California, west of the Salton Sea. The deformation is centered at 33.1 N latitude, 116.0 W longitude. 18 ERS-1 and ERS-2 (descending) interferograms falling within 1992 to 2000 are analyzed. An average line-of-sight range change over the area of 6 ± 3 mm per year away from the satellite is observed with peak values up to 12 ± 3 mm per year. The southwestern edge of the deformation is partially bounded by a fault segment that ruptured in the 1968 Mw 6.5 Borrego Mountain earthquake and which also showed triggered slip after the 1987 Superstition Hills earthquakes. The southeastern edge of the deformation also coincides with a mapped fault. The deformation is centered on a farming area that has pumped approximately 5.8 × 10-6 m3 per year of groundwater from 5 wells on the property and which shows declining water levels of 1.4 m per year. The area of highest change appears to be centered on location of the wells and away from the faults. The aquifer is at a depth of roughly 100 to 200 m and consists of sands with interbedded clays. It appears that the most likely explanation is subsidence due to groundwater withdrawal in a fault-bounded aquifer rather than tectonic slip.

  6. Evaluating Channel Head Conditions for Environmental Impact Assessment in Northwestern Sonoma County, California

    NASA Astrophysics Data System (ADS)

    Sherwood, M. N.; O'Connor, M.; Pennington, R.

    2007-12-01

    Erosion and sedimentation have been identified as processes significantly affecting water quality in northern California Coast Range watersheds. These watersheds, including the Gualala River watershed in northwestern Sonoma County, have been designated as having water quality impaired by sediment under provisions of the Clean Water Act Section 303(d). A study was performed to estimate potential increases in erosion rates resulting from proposed vineyard development of ridge top forestland in the Gualala River watershed. The study area has an extensive history of logging, with substantial ground disturbance from tractors. The study area is characterized by flat ridge tops with steeply incised drainages shaped by debris slides, rock slides and earth flows. Jurassic age sedimentary and meta-sedimentary rocks of the coastal and central belt Franciscan formation comprise the underlying bedrock. Channel head development and advancement has long been understood to play a key role in sediment delivery and is possibly the most sensitive to changes in the external factors such as changes in climate or land use (Dietrich and Dunne 1993). Quantifying the amount of sediment contributed by potential channel head incision and/or initiation is an objective of environmental analysis for the project. Field surveys were performed during the field seasons of 2005 and 2006 to acquire measurements of channel head locations and slope, channel dimensions and substrate associated with the proposed development sites. Analysis of this field data, including the use of ArcGIS, allowed us to examine the local relationships between variables that influence channel initiation. Variables considered include drainage area, slope, soil type, geology and vegetation. An initial analysis of a selection of area-slope data failed to produce an inverse area-slope relationship as has been found in previous studies by Montgomery and Dietrich (1988). A more complete evaluation of the entire data set is

  7. Preliminary isostatic gravity map of the Sonoma volcanic field and vicinity, Sonoma and Napa Counties, California

    USGS Publications Warehouse

    Langenheim, V.E.; Roberts, C.W.; McCabe, C.A.; McPhee, D.K.; Tilden, J.E.; Jachens, R.C.

    2006-01-01

    This isostatic residual gravity map is part of a three-dimensional mapping effort focused on the subsurface distribution of rocks of the Sonoma volcanic field in Napa and Sonoma counties, northern California. This map will serve as a basis for modeling the shapes of basins beneath the Santa Rosa Plain and Napa and Sonoma Valleys, and for determining the location and geometry of faults within the area. Local spatial variations in the Earth's gravity field (after accounting for variations caused by elevation, terrain, and deep crustal structure explained below) reflect the distribution of densities in the mid to upper crust. Densities often can be related to rock type, and abrupt spatial changes in density commonly mark lithologic boundaries. High-density basement rocks exposed within the northern San Francisco Bay area include those of the Mesozoic Franciscan Complex and Great Valley Sequence present in the mountainous areas of the quadrangle. Alluvial sediment and Tertiary sedimentary rocks are characterized by low densities. However, with increasing depth of burial and age, the densities of these rocks may become indistinguishable from those of basement rocks. Tertiary volcanic rocks are characterized by a wide range in densities, but, on average, are less dense than the Mesozoic basement rocks. Isostatic residual gravity values within the map area range from about -41 mGal over San Pablo Bay to about 11 mGal near Greeg Mountain 10 km east of St. Helena. Steep linear gravity gradients are coincident with the traces of several Quaternary strike-slip faults, most notably along the West Napa fault bounding the west side of Napa Valley, the projection of the Hayward fault in San Pablo Bay, the Maacama Fault, and the Rodgers Creek fault in the vicinity of Santa Rosa. These gradients result from juxtaposing dense basement rocks against thick Tertiary volcanic and sedimentary rocks.

  8. Habitat restoration plan for Naval Petroleum Reserve No. 1, Kern County, California

    SciTech Connect

    O'Farrell, T.P.; Mitchell, D.L.

    1985-10-01

    In 1976 Congress directed that production on the US Department of Energy's (DOE) Naval Petroleum Reserve No. 1 (NPR-1) in Kern County, California, be increased to the maximum efficient rate to fulfill some United States needs for domestic oil and gas. The US Fish and Wildlife Service (FWS) issued a Biological Opinion, required under the Endangered Species Act of 1973, that proposed construction activities on NPR-1 would jeopardize the continued existence of the endangered San Joaquin kit fox (Vulpes macrotis mutica) and blunt-nosed leopard lizard (Gambelia silus) and damage their critical habitats. One of the reasonable and prudent alternatives that the FWS required if the project were to proceed was that DOE prepare this plan to restore disturbed habitats. The plan was based on published information and the results of habitat restoration studies conducted on NPR-1 between 1981 and 1983. Preconstruction surveys will be used to insure that new disturbances are the minimum size necessary, topsoil is salvaged, and engineering practices are implemented to control soil erosion and enhance revegetation. Existing disturbances will be located, inventoried, classified, and restored using existing guidelines. Native and naturalized plant seeds will be harvested and cultivated; shrub seedlings will be grown in containers suitable for transplantation. An inventory of disturbances, results of preconstruction activities, inventory of topsoil reserves, changes in habitat quality, uses of herbicides and toxic substances, and program costs will be monitored and used to document progress and evaluate the success of the program. Results of the program will be documented in an annual report, at technical information meetings and published in DOE topical reports and scientific journals. 46 refs., 1 fig. 4 tabs.

  9. Wildlife management plan, Naval Petroleum Reserve No. 1, Kern County, California

    SciTech Connect

    O'Farrell, T.P.; Scrivner, J.H.

    1987-01-01

    Under the Naval Petroleum Act of 1976, Congress directed the Secretary of the Navy and subsequently the Secretary of Energy, to produce petroleum products from Naval Petroleum Reserve No. 1 (NPR-1) in Kern County, California, at the maximum efficient rate consistent with sound engineering practices. Because of the presence of two endangered species and the quality, quantity, and contiguous nature of habitat on NPR-1, the area is unique and management of its resources deserves special attention. The purpose of this wildlife management plan is to: (1) draw together specific information on NPR-1 wildlife resources; (2) suggest management goals that could be implemented, which if achieved, would result in diverse, healthy wildlife populations; and (3) reinitiate cooperative agreements between the US Department of Energy (DOE) and other conservation organizations regarding the management of wildlife on NPR-1. NPR-1 supports an abundant and diverse vertebrate fauna. Twenty-five mammalian, 92 avian, eight reptilian, and two amphibian species have been observed on Elk Hills. Of these, three are endangered (San Joaquin kit fox, Vulpes macrotis mutica; giant kangaroo rat, Dipodomys ingens; blunt-nosed leopard lizard, Gambelia silus). Nine vertebrates, six invertebrates, and four plant species known to occur or suspected of occurring on Elk Hills are potential candidates for listing. A major objective of this management plan is to minimize the impact of petroleum development activities on the San Joaquin kit fox, giant kangaroo rat, blunt-nosed leopard lizard, and their essential habitats. This will mainly be achieved by monitoring the status of these species and their habitat and by restoring disturbed habitats. In general, management policies designed to benefit the above three species and other species of concern will also benefit other wildlife inhabiting NPR-1.

  10. Report of endangered species studies on Naval Petroleum Reserve No. 2, Kern County, California

    SciTech Connect

    O'Farrell, T.P.; Warrick, G.D.; Mathews, N.E.; Kato, T.T.

    1987-09-01

    Between 1983 and 1986 the size of the population of San Joaquin kit foxes (Vulpes macrotis mutica) on Naval Petroleum Reserve No. 2 (NPR-2), Kern County, California, was estimated semiannually using capture-recapture techniques. Although summer population estimates varied between 222 in 1983 and 121 in 1986, and winter estimates varies between 258 in 1984 and 91 in 1983, the population appeared to remain relatively stable at an apparent norm of 165. Kit foxes were abundant even in the intensely developed areas, and numbers and densities (1.12 to 2.49/sq mile) were consistently higher on NPR-2 than on neighboring NPR-1. The percentage of adult vixens that successfully raised pups was 55%, average litter size was 4.0 +- 0.0, and the sex ratio (M:F) of 25 pups was 1:1.5. Most (45.2%) foxes were killed by coyotes (Canis latrans), vehicles killed 6.4%, and 6.5% died of other causes. A cause could not be determined for 41.9% of the deaths. There was a general increase in coyote visitation rates at scent stations, but kit fox visitation rates generally decreased. Kit fox indices were consistently higher on NPR-2 than on NPR-1. Approximately 15% of the kit foxes on NPR-2 dispersed an average of 2.2 +- 0.2 miles. Average dispersal distance did not differ between the sexes. The longest dispersal was 6.9 miles. Proportionately more male than female pups dispersed. Remains of lagomorphs (jackrabbits and cottontails) and kangaroo rats had the highest frequency of occurrence in scats. Frequency of occurrence of lagomorph remains was greater in developed than in undeveloped habitats. Proportions of lagomorph remains increased and kangaroo rat remains decreased between 1983 and 1984. 62 refs., 9 figs., 24 tabs.

  11. 76 FR 42112 - Humboldt (NV) Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-18

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF AGRICULTURE Forest Service Humboldt (NV) Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The Humboldt (NV) Resource Advisory Committee will meet in Winnemucca, Nevada....

  12. Alexander von Humboldt and the Origins of Landscape Archaeology.

    ERIC Educational Resources Information Center

    Mathewson, Kent

    1986-01-01

    Reviews the life, theories, and influence of Alexander von Humboldt, the early nineteenth century founder of modern geography. Maintains that Humboldt's novel approaches to the study of landscape antiquities have value for contemporary students in cultural and historical geography. (JDH)

  13. 77 FR 45331 - Humboldt (NV) Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-07-31

    ... Forest Service Humboldt (NV) Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of meetings. SUMMARY: The Humboldt (NV) Resource Advisory Committee will meet in Winnemucca, Nevada. The... Title II funding procedures and Humboldt (NV) RAC operating guidelines, consider and recommend 2012...

  14. 77 FR 56179 - Humboldt (NV) Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-09-12

    ... Forest Service Humboldt (NV) Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The Humboldt (NV) RAC will meet in Winnemucca, NV. The committee is authorized under the... to recommend projects to the Humboldt-Toiyabe Forest Supervisor. Lacking any final business,...

  15. 78 FR 52903 - Humboldt (NV) Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-08-27

    ... Forest Service Humboldt (NV) Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The Humboldt (NV) Resource Advisory Committee (RAC) will meet in Winnemucca, Nevada. The... Humboldt- Toiyabe Forest Supervisor and/or review prior year project accomplishments; lacking any...

  16. Summary and evaluation of the coyote control program, Naval Petroleum Reserve No. 1, Kern County, California, 1986

    SciTech Connect

    Scrivner, J.H.; Harris, C.E.

    1986-11-01

    For the second consecutive year (1986) the US Department of Energy funded a coyote (Canis latrans) control program in an attempt to reduce predation of the endangered San Joaquin kit fox (Vulpes macrotis mutica) on Naval Petroleum Reserve No. 1 in Kern County, California. A total of 46 adult and 18 pups were taken. Trapping was the most productive control method. Data were gathered on standard measurements, weights, ages, and reproductive condition of the coyotes. No kit foxes were trapped. Recommendations were made to begin the 1986/1987 control program in December 1986, and to use helicopters for aerial gunning and to locate coyote dens.

  17. Late Cenozoic geology and lacustrine history of Searles Valley, Inyo and San Bernardino Counties, California

    NASA Astrophysics Data System (ADS)

    Nathenson, M.; Smith, G. I.; Robinson, J. E.; Stauffer, P. H.; Zigler, J. L.

    2010-12-01

    (beaches or tufa benches) are common, but their deposits tend to be thin. Combining the subsurface evidence of lake history with the outcrop record allows the history of lake fluctuations to be reconstructed for the period between about 150 ka and the present. Translating this record of lake fluctuations into paleohydrologic and paleoclimatic histories is complicated by uncertainties as to which of the several components of climate affected runoff volumes and lake-surface evaporation. A simplified model, however, suggests that the flow of the Owens River stayed between 2.5 and 4.5 times its present flow volume for most of the past 150 ky. Its flow exceeded this range only about 14 percent of the time, and it fell below this range only 4 percent of the time—which includes the present. In fact, the past 10 ky is clearly the driest period during the past 150 ky in the Owens River drainage. Smith, G.I., 2009, Late Cenozoic geology and lacustrine history of Searles Valley, Inyo and San Bernardino Counties, California: U.S. Geological Survey Professional Paper 1727, 115 p., 4 plates.

  18. Airborne radioactivity surveys in the Mojave Desert region, Kern, Riverside, and San Bernardino Counties, California

    USGS Publications Warehouse

    Moxham, Robert M.

    1952-01-01

    Airborne radioactivity surveys in the Mojave Desert region Kern, Riverside, and Bernardino counties were made in five areas recommended as favorable for the occurrence of radioactive raw materials: (1) Rock Corral area, San Bernardino County. (2) Searles Station area, Kern county. (3) Soledad area, Kern County. (4) White Tank area, Riverside and San Bernardino counties. (5) Harvard Hills area, San Bernardino County. Anomalous radiation was detected in all but the Harvard Hills area. The radioactivity anomalies detected in the Rock Corral area are of the greatest amplitude yet recorded by the airborne equipment over natural sources. The activity is apparently attributable to the thorium-beating mineral associated with roof pendants of crystalline metamorphic rocks in a granitic intrusive. In the Searles Station, Soledad, and White Tank area, several radioactivity anomalies of medium amplitude were recorded, suggesting possible local concentrations of radioactive minerals.

  19. Rainfall and Seasonal Movement of the Weeks Creek Landslide, San Mateo County, California

    USGS Publications Warehouse

    Wieczorek, Gerald F.; Reid, Mark E.; Jodicke, Walter; Pearson, Chris; Wilcox, Grant

    2007-01-01

    Introduction Many different types of landslide occur in the Santa Cruz Mountains of San Mateo County, Calif. (Brabb and Pampeyan, 1972); most slope movement is triggered by strong earthquakes, heavy rainfall, or shoreline erosion. In this area, shallow landslides of loose soil and rock, which may transform into debris flows, commonly occur during individual storms when rainfall exceeds a threshold of intensity and duration (Cannon and Ellen, 1985; Wieczorek and Sarmiento, 1988; Wilson and Wieczorek, 1995). In contrast, deeper rotational and translational slides (Varnes, 1978) typically begin to move only after days to weeks or months of heavy rain. Once started, they can continue to move for months during and after a heavy rainfall season, for example, the Scenic Drive landslide at La Honda, Calif. (Jayko and others, 1998; Wells and others, 2005, 2006). Although the rainfall characteristics triggering rapid, shallow landslides have been documented (Wieczorek, 1987; Cannon and Ellen, 1988), the rainfall conditions leading to repeated deeper-seated slope movements are less well known. The Weeks Creek landslide (Adam, 1975), near the western crest of the Santa Cruz Mountains north of La Honda in San Mateo County (fig. 1), consists of a large prehistoric section containing a historically active section; both sections have earthflow morphologies. The entire landslide mass, which extends about 1,000 m westward from an elevation of 220 m down to an elevation of 120 m, is about 300 to 370 m wide (Cole and others, 1994); The prehistoric section of the landslide is about 30 m deep and approximately 10 million m3 in volume (Cole and others, 1994). The smaller, historically active portion of the Weeks Creek landslide (fig. 1) is only approximately 500 m long, 200 m wide, and 13 m deep (Cole and others, 1994). Near the landslide, the Santa Cruz Mountains consist of tightly folded, Tertiary sedimentary bedrock materials of the Butano sandstone and San Lorenzo Formations (Eocene

  20. Sequential Sediment Budgets in an Ungauged Watershed: Redwood Creek, Marin County, California

    NASA Astrophysics Data System (ADS)

    Downs, P. W.; Stallman, J.

    2005-12-01

    Sediment budgets provide an organizing framework in fluvial geomorphology and have enormous potential in environmental management. A sediment budget approach assisted in developing strategies for restoring Big Lagoon, the wetland ecosystem at the terminus of the 22.7 km2 Redwood Creek watershed in Marin County, California. Persistence of a restored lagoon largely depends on the current sediment yield relative to the reference yield prior to European settlement. Process-based, distributed sediment budgets were constructed for several historical time periods to account for accelerated sediment production from contemporary land management practices and legacy factors stemming from past resource exploitation. Sediment production, storage, and transfer were investigated using digital terrain modeling, field reconnaissance to ascertain and validate hillslope processes, mainstem channel surveys and dendrochronology to assess trends in alluvial sediment storage, application of published process rate estimates, use of short-term and prorated stream gauging records, and sediment transport modeling to validate sediment yields into Big Lagoon. Evidence suggests that the Redwood Creek valley bottom aggraded from at least 3,500 B.P., with floodplain wetlands acting as sediment sinks (average annual sediment yield of 34 t km2 yr-1). Channel incision rapidly followed European settlement and intensive hillslope disturbances beginning around 1840 (peak yield 1921-1982 of 324 t km2 yr-1). Mainstem and large tributary valley bottoms became major sediment sources during this time and remain sources despite progressive retirement of most agricultural land use (yield 1981-2000 of 198 t km2 yr-1). Numerous issues related to data availability and resolution limited quantification of some sediment sources and resulted in potential uncertainties in estimates of yield to Big Lagoon. Historical sediment budgets, however, require more than adequate data sources, they require accurate conceptual

  1. Potential CO2 Sequestration in Oil Field Reservoirs: Baseline Mineralogy and Natural Diagenesis, Kern County, California

    NASA Astrophysics Data System (ADS)

    Horton, R. A.; Kaess, A. B.; Nguyen, D. T.; Caffee, S. E.; Olabise, O. E.

    2015-12-01

    Depleted oil fields have been suggested as potential sites for sequestration of CO2 generated from the burning of hydrocarbons. However, to be effective for removing CO2 from the atmosphere, the injected CO2 must remain within the reservoir. The role of atmospheric CO2 in rock weathering is well known and a growing body of experimental work indicates that under reservoir conditions supercritical CO2 also reacts with sedimentary rocks. In order to predict the behavior of injected CO2 in a given reservoir, detailed knowledge of the mineralogy is required. In addition, post-injection monitoring may include analyzing core samples to examine interactions between reservoir rocks and the CO2. Thus, documentation of the natural diagenetic processes within the reservoir is necessary so that changes caused by reactions with CO2 can be recognized. Kern County, California has been a major petroleum producing area for over a century and has three oil fields that have been identified as potential sites for CO2 sequestration. Two of these, Rio Bravo-Greeley and McKittrick, have no previously published mineralogic studies. Samples from these (and nearby Wasco) oil fields were studied using transmitted-light petrography and scanning electron microscopy. At Rio Bravo-Greeley-Wasco, Kreyenhagen (Eocene) and Vedder (Oligocene) sandstones are mainly arkosic arenites with only small amounts of volcanic rock fragments. Detrital feldspars exhibit wide compositional ranges (up to Or75Ab25 & Ab50An50). Diagenesis has greatly altered the rocks. There are significant amounts of relatively pure authigenic K-feldspar and albite. Small amounts of authigenic quartz, calcite, dolomite, ankerite, kaolinite, illite/smectite, chlorite, zeolite, and pyrite are present. Plagioclase has been preferentially dissolved, with andesine more susceptible than oligoclase. Al3+ has been exported from the sandstones. At McKittrick, Temblor sandstones (Oligocene-Miocene) contain up to 33% volcanic rock fragments

  2. Final Scientific / Technical Report, Geothermal Resource Exploration Program, Truckhaven Area, Imperial County, California

    SciTech Connect

    Layman Energy Associates, Inc.

    2006-08-15

    With financial support from the U.S. Department of Energy (DOE), Layman Energy Associates, Inc. (LEA) has completed a program of geothermal exploration at the Truckhaven area in Imperial County, California. The exploratory work conducted by LEA included the following activities: compilation of public domain resource data (wells, seismic data, geologic maps); detailed field geologic mapping at the project site; acquisition and interpretation of remote sensing imagery such as aerial and satellite photographs; acquisition, quality control and interpretation of gravity data; and acquisition, quality control and interpretation of resistivity data using state of the art magnetotelluric (MT) methods. The results of this exploratory program have allowed LEA to develop a structural and hydrologic interpretation of the Truckhaven geothermal resource which can be used to guide subsequent exploratory drilling and resource development. Of primary significance, is the identification of an 8 kilometer-long, WNW-trending zone of low resistivity associated with geothermal activity in nearby wells. The long axis of this low resistivity zone is inferred to mark a zone of faulting which likely provides the primary control on the distribution of geothermal resources in the Truckhaven area. Abundant cross-faults cutting the main WNW-trending zone in its western half may indicate elevated fracture permeability in this region, possibly associated with thermal upwelling and higher resource temperatures. Regional groundwater flow is inferred to push thermal fluids from west to east along the trend of the main low resistivity zone, with resource temperatures likely declining from west to east away from the inferred upwelling zone. Resistivity mapping and well data have also shown that within the WNW-trending low resistivity zone, the thickness of the Plio-Pleistocene sedimentary section above granite basement ranges from 1,900–2,600 meters. Well data indicates the lower part of this

  3. Reservoir characterization and diagenesis of the oligocene 64-zone sandstone, North Belridge Field, Kern County, California

    SciTech Connect

    Taylor, T.R. ); Soule, C.H. )

    1993-09-01

    The Oligocene (Zemorrian) 64-Zone sandstone is an important oil and gas reservoir in North Belridge field, Kern County, California. The 64-Zone is a submarine-fan deposit that ranges from 83 to 137 m in thickness. The overall variations in reservoir quality reflect an upward increase in grain size associated with depositional processes. Three diagenetic events have had a significant impact on reservoir quality: (1) compaction, which reduced intergranular volume to an average of 20%, (2) quartz cement, which reduced porosity by an average of 6.2%, and (3) feldspar dissolution. Although an average of 2.7% porosity is directly associated with leached feldspar grains, mass balance calculations indicate secondary porosity is roughly balanced by formation of authigenic kaolinite, resulting in little or no net gain in porosity. Three episodes of calcite cementation reflect various stages of burial history. Petrographic and isotopic data demonstrate that calcite I formed at shallow depths in the zone of bacterial sulfate reduction. Fluid inclusion data indicate that calcite II precipitated at temperatures of 92 to 167[degrees]C from fluids less saline than seawater. Fracture-filing calcite III post-dates calcite II, but formed at lower temperatures (85 to 125[degrees]C). The results of isotopic modeling indicate that calcite II precipitated in equilibrium with waters expelled by shales during I/S diagenesis ([delta][sup 18]O[sub SMOW] = + 2 to +8%) and that calcite III precipitated during tectonic uplift from a mixture of shale-derived and meteoric waters ([delta][sup 18]O[sub SMOW] = 0 to +4%). Most fluid inclusions in calcite II yield temperatures greater than present bottom-hole values ([approximately]110[degrees]C). Assuming that fluid inclusions in calcite II record maximum burial and geothermal gradient of 33[degrees]C/km, tectonic uplift of 0.6 to 1.7 km ([approximately]2000-5700 ft) would be required to explain the fluid inclusion data. 48 refs., 18 figs., 1 tab.

  4. Data from a thick unsaturated zone in Joshua Tree, San Bernardino County, California, 2007--09

    USGS Publications Warehouse

    Burgess, Matthew; Izbicki, John; Teague, Nicholas; O'Leary, David R.; Clark, Dennis; Land, Michael

    2012-01-01

    Data were collected on the physical properties of unsaturated alluvial deposits, the chemical composition of leachate extracted from unsaturated alluvial deposits, the chemical and isotopic composition of groundwater and unsaturated-zone water, and the chemical composition of unsaturated-zone gas at four monitoring sites in the southwestern part of the Mojave Desert in the town of Joshua Tree, San Bernardino County, California. The presence of denitrifying and nitrate-reducing bacteria from unsaturated alluvial deposits was evaluated for two of these monitoring sites that underlie unsewered residential development. Four unsaturated-zone monitoring sites were installed in the Joshua Tree area—two in an unsewered residential development and two adjacent to a proposed artificial-recharge site in an undeveloped area. The two boreholes in residential development areas were installed by using the ODEX air-hammer method. One borehole was drilled through the unsaturated zone to a depth of 541 ft (feet) below land surface; a well screened across the water table was installed. Groundwater was sampled from this well. The second borehole was drilled to a depth of 81 ft below land surface. Drilling procedures, lithologic and geophysical data, construction details, and instrumentation placed in these boreholes are described. Core material was analyzed for water content, bulk density, matric potential, particle size, and water retention. The leachate from over 500 subsamples of cores and cuttings was analyzed for soluble anions, including fluoride, sulfate, bromide, chloride, nitrate, nitrite, and orthophosphate. Groundwater was analyzed for major ions, inorganic compounds, select trace elements, and isotopic composition. Unsaturated-zone water from suction-cup lysimeters was analyzed for major ions, inorganic compounds, select trace elements, and isotopic composition. Unsaturated-zone gas samples were analyzed for argon, oxygen, nitrogen, methane, carbon dioxide, ethane

  5. Location of odor sources and the affected population in Imperial County, California

    SciTech Connect

    Hahn, J.L.

    1981-08-01

    This report is divided into four sections. The first two sections contain general background information on Imperial County. The third section is a general discussion of odor sources in Imperial County, and the fourth maps the specific odor sources, the expected areas of perception, and the affected populations. this mapping is done for the Imperial Valley and each of the four Imperial County KGRA's (Known Geothermal Resource Areas) where odor from the development of the geothermal energy may affect population.

  6. Carbonate-cemented hardgrounds: a subtle indicator for seep activity offshore Humboldt Bay

    NASA Astrophysics Data System (ADS)

    Shapiro, R. S.; Bazard, D.

    2007-12-01

    Active hydrocarbon seeps are common in the accretionary prism of the Cascadia subduction zone. In Humboldt County, California, the prism is exposed at the surface as a series of fault-propagated anticlines trending NW-SE. Offshore of the town of Samoa, a northwest-plunging anticline is breached at approximately 40 meters water depth, allowing hydrocarbons to seep out to the seafloor (40.8° N, 124.25° W). The assumed microbial activity at the seep leads to the production of interstitial carbonate cements forming hardgrounds. Cementation is pervasive and blocks eroded from the seep area of the seabed are transported onshore during storm events. Blocks collected from the beach range from 3--40 centimeters across. The sediments of the blocks are palimpsest transgressive deposits composed mostly of immature fine sand, but ranging from very fine to rounded gravels 4 cm diameter. Cementation is not dependent on grain size as all of the sediment sizes are cemented. In rare void spaces, a concentric banding of cements is obvious. The interstitial cements preserve original sedimentary structures including graded beds and high-angle cross-beds. Centimeter-scale subspherical concretions occur on the undersides of some blocks. There is no disruption of bedding in contrast to other seeps where the expulsion of gas can create pockmarks, brecciation, and other disturbances. Unlike the better studied seeps farther south in the Eel River basin, the Samoa seeps do not seem to host a rich chemosynthetic fauna. Whole and (mostly) fragmented shells preserved by the cemented sands represent a typical benthic inner shelf community including Dendraster, Macoma, and Olivella. Burrows preserved in the sands are largely horizontal and 1--2 mm diameter. Seep carbonate-cemented hardgrounds are less well studied then the more obvious meter-scale 'chemoherm' deposits. However, they may be more prevalent in the rock record and provide a new proxy for locating ancient seeps and hydrocarbon

  7. Health hazard evaluation report HETA 85-345-1665, County of Alameda, Oakland, California. [Data Processing Department

    SciTech Connect

    Belanger, P.L.

    1986-02-01

    Air quality in the Data Processing Department of the County of Alameda, Oakland, California was investigated on May 16, and June 14, 1985. The evaluation was requested by a representative of the Personnel Department, Occupational Health Services, County of Alameda, Oakland, California to investigate indoor air quality problems. Workers had complained about room air temperature, and symptoms such as stuffy head, headaches, burning eyes and raspy throat. There also was concern that the ventilation intake duct, at street level, might be capturing vehicle-exhaust fumes. Approximately 70 to 80 programmers and clerical staff work in the Data Processing Department, which is located in a large windowless room in the basement. An initial environmental survey was conducted in May; in June, carbon monoxide (CO), carbon dioxide (CO/sub 2/) and formaldehyde concentrations in the air were measured using chemical detector tubes. The author concluded that there were no overexposures to CO, CO/sub 2/, or formaldehyde, and that workers complaints may be related to an improperly balanced ventilation system and cigarette smoke.

  8. Genetic Analysis of Invasive Aedes albopictus Populations in Los Angeles County, California and Its Potential Public Health Impact

    PubMed Central

    Zhong, Daibin; Lo, Eugenia; Hu, Renjie; Metzger, Marco E.; Cummings, Robert; Bonizzoni, Mariangela; Fujioka, Kenn K.; Sorvillo, Teresa E.; Kluh, Susanne; Healy, Sean P.; Fredregill, Chris; Kramer, Vicki L.; Chen, Xiaoguang; Yan, Guiyun

    2013-01-01

    The Asian tiger mosquito, Aedes albopictus, is an anthropophilic aggressive daytime-biting nuisance and an efficient vector of certain arboviruses and filarial nematodes. Over the last 30 years, this species has spread rapidly through human travel and commerce from its native tropical forests of Asia to every continent except Antarctica. In 2011, a population of Asian tiger mosquito (Aedes albopictus) was discovered in Los Angeles (LA) County, California. To determine the probable origin of this invasive species, the genetic structure of the population was compared against 11 populations from the United States and abroad, as well as preserved specimens from a 2001 introduction into California using the mitochondrial cytochrome c oxidase 1 (CO1) gene. A total of 66 haplotypes were detected among samples and were divided into three main groups. Aedes albopictus collected in 2001 and 2011 from LA County were genetically related and similar to those from Asia but distinct from those collected in the eastern and southeastern United States. In view of the high genetic similarities between the 2001 and 2011 LA samples, it is possible that the 2011 population represents in part the descendants of the 2001 introduction. There remains an imperative need for improved surveillance and control strategies for this species. PMID:23861921

  9. Drilling Addendum to Resource Assessment of Low- and Moderate-Temperature Geothermal Waters in Calistoga, Napa County, California

    SciTech Connect

    Taylor, Gary C.; Bacon, C. Forrest; Chapman, Rodger H.; Chase, Gordon W.; Majmundar, Hasmukhrai H.

    1981-05-01

    This addendum report presents the results of the California Division of Mines and Geology (CDMG) drilling program at Calistoga, California, which was the final geothermal-resource assessment investigation performed under terms of the second year contract (1979-80) between the U.S. Department of Energy (DOE) and the CDMG under the State Coupled Program. This report is intended to supplement information presented in CDMG's technical report for the project year, ''Resource Assessment of Low- and Moderate-Temperature Geothermal Waters in Calistoga, Napa County, California''. During the investigative phase of the CDMG's Geothermal Project, over 200 well-driller's reports were obtained from the Department of Water Resources (DWR). It was hoped that the interpretation and correlation of these logs would reveal the subsurface geology of the Upper Napa Valley and also provide a check for the various geophysical surveys that were performed in the course of the study. However, these DWR driller logs proved to be inadequate due to the brief, non-technical, and erroneous descriptions contained on the logs. As a result of the lack of useable drill-hole data, and because information was desired from,deeper horizons, it became evident that drilling some exploratory holes would be necessary in order to obtain physical evidence of the stratigraphy and aquifers in the immediate Calistoga area. Pursuant to this objective, a total of twelve sites were selected--four under jurisdiction of Napa County and eight under jurisdiction of the City of Calistoga. A moratorium is currently in existence within Napa County on most geothermal drilling, and environmental and time constraints precluded CDMG from obtaining the necessary site permits within the county. However, a variance was applied for and obtained from the City of Calistoga to allow CDMG to drill within the city limits. With this areal constraint and also funding limits in mind, six drilling sites were selected on the basis of (1

  10. 76 FR 26192 - Revisions to the California State Implementation Plan, Northern Sonoma County Air Pollution...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-05-06

    ... Pollution Control District (NSCAPCD) and Mendocino County Air Quality Management District (MCAQMD) AGENCY... approve revisions to the Northern Sonoma County Air Pollution Control District (NSCAPCD) and Mendocino... and July 31, 1998, respectively (See 64 FR 6223 and 63 FR 40830). There are no other...

  11. 75 FR 27975 - Revisions to the California State Implementation Plan; Imperial County Air Pollution Control...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-05-19

    ...: EPA is proposing to approve revisions to the Imperial County Air Pollution Control District (ICAPCD... previous version of Rule 420 (see 68 FR 8839). CARB has made no subsequent submittals of the rule. C. What..., Imperial County was reclassified as a serious PM nonattainment area (see 69 FR 48792 and 40 CFR part...

  12. Evaluation of the Life Skills Training Program, Los Angeles County, California: Final Report

    ERIC Educational Resources Information Center

    Courtney, Mark E.; Zinn, Andrew; Zielewski, Erica H.; Bess, Roseana J.; Malm, Karin E.; Stagner, Matthew; Pergamit, Michael

    2008-01-01

    This report presents findings from a rigorous evaluation of the Life Skills Training Program (LST) in Los Angeles County. LST provides 30 hours of life skills training over five weeks to foster youths ages 16 and older. The classes are held on community college campuses throughout Los Angeles County. The program is staffed by workers tasked with…

  13. 33 CFR 165.1195 - Regulated Navigation Area; Humboldt Bay Bar Channel and Humboldt Bay Entrance Channel, Humboldt...

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... substances listed in 46 CFR 153.40. Humboldt Bay Area means the area described in the location section of... requirements listed in title 33 CFR, part 160, Ports and Waterways Safety—General, subpart C—Notifications of “Arrivals, Departures, Hazardous Conditions, and Certain Dangerous Cargoes”, the owner, master, agent...

  14. 33 CFR 165.1195 - Regulated Navigation Area; Humboldt Bay Bar Channel and Humboldt Bay Entrance Channel, Humboldt...

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... substances listed in 46 CFR 153.40. Humboldt Bay Area means the area described in the location section of... requirements listed in title 33 CFR, part 160, Ports and Waterways Safety—General, subpart C—Notifications of... transit and must be stationed so as to provide immediate assistance in response to the loss of power...

  15. 33 CFR 165.1195 - Regulated Navigation Area; Humboldt Bay Bar Channel and Humboldt Bay Entrance Channel, Humboldt...

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... substances listed in 46 CFR 153.40. Humboldt Bay Area means the area described in the location section of... requirements listed in title 33 CFR, part 160, Ports and Waterways Safety—General, subpart C—Notifications of... transit and must be stationed so as to provide immediate assistance in response to the loss of power...

  16. 33 CFR 165.1195 - Regulated Navigation Area; Humboldt Bay Bar Channel and Humboldt Bay Entrance Channel, Humboldt...

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... substances listed in 46 CFR 153.40. Humboldt Bay Area means the area described in the location section of... requirements listed in title 33 CFR, part 160, Ports and Waterways Safety—General, subpart C—Notifications of... transit and must be stationed so as to provide immediate assistance in response to the loss of power...

  17. Habitat requirements of the endangered California freshwater shrimp (Syncaris pacifica) in lagunitas and Olema creeks, Marin County, California, USA

    USGS Publications Warehouse

    Martin, Barbara A.; Saiki, Michael K.; Fong, Darren

    2009-01-01

    This study was conducted to better understand the habitat requirements and environmental limiting factors of Syncaris pacifica, the California freshwater shrimp. This federally listed endangered species is native to perennial lowland streams in a few watersheds in northern California. Field sampling occurred in Lagunitas and Olema creeks at seasonal intervals from February 2003 to November 2004. Ten glides, five pools, and five riffles served as fixed sampling reaches, with eight glides, four pools, and four riffles located in Lagunitas Creek and the remainder in Olema Creek. A total of 1773 S. pacifica was counted during this study, all of which were captured along vegetated banks in Lagunitas Creek. Syncaris pacifica was most numerous in glides (64), then in pools (31), and lastly in riffles (5). According to logistic regression analysis, S. pacifica was mostly associated with submerged portions of streambank vegetation (especially overhanging vegetation such as ferns and blackberries, emergent vegetation such as sedge and brooklime, and fine roots associated with water hemlock, willow, sedge, and blackberries) along with low water current velocity and a sandy substrate. These seemingly favorable habitat conditions for S. pacifica were present in glides and pools in Lagunitas Creek, but not in Olema Creek. ?? 2009 The Crustacean Society.

  18. Diversity of Methicillin-Resistant Staphylococcus aureus (MRSA) Strains Isolated from Inpatients of 30 Hospitals in Orange County, California

    PubMed Central

    Hudson, Lyndsey O.; Murphy, Courtney R.; Spratt, Brian G.; Enright, Mark C.; Elkins, Kristen; Nguyen, Christopher; Terpstra, Leah; Gombosev, Adrijana; Kim, Diane; Hannah, Paul; Mikhail, Lydia; Alexander, Richard; Moore, Douglas F.; Huang, Susan S.

    2013-01-01

    There is a need for a regional assessment of the frequency and diversity of MRSA to determine major circulating clones and the extent to which community and healthcare MRSA reservoirs have mixed. We conducted a prospective cohort study of inpatients in Orange County, California, systematically collecting clinical MRSA isolates from 30 hospitals, to assess MRSA diversity and distribution. All isolates were characterized by spa typing, with selective PFGE and MLST to relate spa types with major MRSA clones. We collected 2,246 MRSA isolates from hospital inpatients. This translated to 91/10,000 inpatients with MRSA and an Orange County population estimate of MRSA inpatient clinical cultures of 86/100,000 people. spa type genetic diversity was heterogeneous between hospitals, and relatively high overall (72%). USA300 (t008/ST8), USA100 (t002/ST5) and a previously reported USA100 variant (t242/ST5) were the dominant clones across all Orange County hospitals, representing 83% of isolates. Fifteen hospitals isolated more t008 (USA300) isolates than t002/242 (USA100) isolates, and 12 hospitals isolated more t242 isolates than t002 isolates. The majority of isolates were imported into hospitals. Community-based infection control strategies may still be helpful in stemming the influx of traditionally community-associated strains, particularly USA300, into the healthcare setting. PMID:23637976

  19. Report of the Preliminary Archaeological Reconnaissance of the Lawrence Livermore Laboratory Site 300, San Joaquin County, California

    SciTech Connect

    Busby, C

    2009-11-24

    The area subject to this investigation is the existing Lawrence Livermore Laboratory Site 300, located in the region north of Corral Hollow; approximately eight and one half miles southwest of Tracy, San Joaquin County, California. Cartographic location can be determined from the Tracy and Midway USGS 7.5 minute topographic quadrangles, the appropriate portions of which are herein reproduced as Maps 1 and 2. The majority of the approximate 7000 acres of the location lies within San Joaquin County. This includes all of the area arbitrarily designated the 'Eastern Portion' on Map 2 and the majority of the area designated the 'Western Portion' on Map 1. The remaining acreage, along the western boundary of the location, lies within Alameda County. The area is located in the region of open rolling hills immediately north of Corral Hollow, and ranges in elevation from approximately 600 feet, on the flood plain of Corral Hollow Creek, to approximately 1700 feet in the northwest portion of the project location. Proposed for the area under investigation are various, unspecified improvements or modifications to the existing Site 300 facilities. Present facilities consist of scattered buildings, bunkers and magazines, utilized for testing and research purposes, including the necessary water, power, and transportation improvements to support them. The vast majority of the 7000 acres location is presently open space, utilized as buffer zones between test locations and as firing ranges.

  20. Rickettsial Infections among Ctenocephalides felis and Host Animals during a Flea-Borne Rickettsioses Outbreak in Orange County, California.

    PubMed

    Maina, Alice N; Fogarty, Carrie; Krueger, Laura; Macaluso, Kevin R; Odhiambo, Antony; Nguyen, Kiet; Farris, Christina M; Luce-Fedrow, Alison; Bennett, Stephen; Jiang, Ju; Sun, Sokanary; Cummings, Robert F; Richards, Allen L

    2016-01-01

    Due to a resurgence of flea-borne rickettsioses in Orange County, California, we investigated the etiologies of rickettsial infections of Ctenocephalides felis, the predominant fleas species obtained from opossums (Didelphis virginiana) and domestic cats (Felis catus), collected from case exposure sites and other areas in Orange County. In addition, we assessed the prevalence of IgG antibodies against spotted fever group (SFGR) and typhus group (TGR) rickettsiae in opossum sera. Of the 597 flea specimens collected from opossums and cats, 37.2% tested positive for Rickettsia. PCR and sequencing of rickettsial genes obtained from C. felis flea DNA preparations revealed the presence of R. typhi (1.3%), R. felis (28.0%) and R. felis-like organisms (7.5%). Sera from opossums contained TGR-specific (40.84%), but not SFGR-specific antibodies. The detection of R. felis and R. typhi in the C. felis fleas in Orange County highlights the potential risk for human infection with either of these pathogens, and underscores the need for further investigations incorporating specimens from humans, animal hosts, and invertebrate vectors in endemic areas. Such studies will be essential for establishing a link in the ongoing flea-borne rickettsioses outbreaks. PMID:27537367

  1. Rickettsial Infections among Ctenocephalides felis and Host Animals during a Flea-Borne Rickettsioses Outbreak in Orange County, California

    PubMed Central

    Fogarty, Carrie; Krueger, Laura; Macaluso, Kevin R.; Odhiambo, Antony; Nguyen, Kiet; Farris, Christina M.; Luce-Fedrow, Alison; Bennett, Stephen; Jiang, Ju; Sun, Sokanary; Cummings, Robert F.; Richards, Allen L.

    2016-01-01

    Due to a resurgence of flea-borne rickettsioses in Orange County, California, we investigated the etiologies of rickettsial infections of Ctenocephalides felis, the predominant fleas species obtained from opossums (Didelphis virginiana) and domestic cats (Felis catus), collected from case exposure sites and other areas in Orange County. In addition, we assessed the prevalence of IgG antibodies against spotted fever group (SFGR) and typhus group (TGR) rickettsiae in opossum sera. Of the 597 flea specimens collected from opossums and cats, 37.2% tested positive for Rickettsia. PCR and sequencing of rickettsial genes obtained from C. felis flea DNA preparations revealed the presence of R. typhi (1.3%), R. felis (28.0%) and R. felis-like organisms (7.5%). Sera from opossums contained TGR-specific (40.84%), but not SFGR-specific antibodies. The detection of R. felis and R. typhi in the C. felis fleas in Orange County highlights the potential risk for human infection with either of these pathogens, and underscores the need for further investigations incorporating specimens from humans, animal hosts, and invertebrate vectors in endemic areas. Such studies will be essential for establishing a link in the ongoing flea-borne rickettsioses outbreaks. PMID:27537367

  2. Humboldt, Alexander von (1769-1859)

    NASA Astrophysics Data System (ADS)

    Murdin, P.

    2000-11-01

    Naturalist, geographer, explorer, born in Tegel Palace, Berlin. The Humboldt current off the west coast of South America is named after him. He named the gegenschein. He set in train an international project organized by GAUSS to study terrestrial magnetism. His major work, Kosmos, based on lectures at Berlin University, endeavoured to provide a comprehensive physical picture of the universe. ...

  3. Humboldt's Legacy and the Restoration of Science.

    ERIC Educational Resources Information Center

    Sachs, Aaron

    1995-01-01

    Examines issues related to specialization in science in the context of the work of Alexander Von Humboldt, one of the first popular scientists in the 19th century and Charles Darwin's mentor. Chronicles the impacts of a science dominated by specialization and argues for increased emphasis on interdisciplinary environmental study. (LZ)

  4. Evaluation of two low-flow releases from Big Tujunga Reservoir, Los Angeles County, California, 2003

    USGS Publications Warehouse

    Mendez, Gregory O.

    2005-01-01

    Since 1973, the Santa Ana Sucker (Catostomus santaanae) has been listed as a threatened species under the Endangered Species Act. The Lower Big Tujunga Creek, in Los Angeles County, is one of the areas in southern California where the Santa Ana Sucker is still present. This study was designed to assess two flow releases from Big Tujunga Dam that may contribute to favorable habitat conditions for the Santa Ana Sucker. It is important for the Santa Ana Sucker's survival that pools in the lower reach of the study area are replenished periodically. The focus of the study area was on the Lower Big Tujunga Creek within a reach extending approximately 6 miles downstream from the Big Tujunga Reservoir. Six sites were established from the Big Tujunga Dam to Delta Flats day-use area for data collection. This report describes the study design, discharge measurements, and the flow data collected from the two releases. Two scheduled flows (phases 1 and 2) were released from the Big Tujunga Reservoir in August and September 2003. During the first phase, which lasted 50 hours, travel times from the dam to four sites downstream were determined. Arrival times at the four sites were determined on the basis of temperature data. Travel time from the dam to site 6 (the furthest downstream site) was about 51.5 hours. Travel times for subreaches were 3 hours from site 1 to site 2, 6.5 hours from site 2 to site 3, almost 18 hours from site 3 to site 4, and 24 hours from site 4 to site 6. The temperature probe at site 5 was destroyed, and thus the arrival time could not be estimated. A probe that measures stage was placed in one of the many pools downstream from site 4 to evaluate a typical pool response to a low-flow release. Also, discharge measurements were taken at four sites along the study reach. In phase 2, which lasted 5 days (121 hours), flow losses along the 6-mile reach were analyzed. Losses were estimated by measuring difference in flow from the dam to sites 3, 4, 5, and 6

  5. 78 FR 66058 - Habitat Conservation Plan for South Sacramento County, California

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-11-04

    ..., 2008 (73 FR 32729). The draft EIS/ EIR will evaluate the impacts of several alternatives related to the... projects would occur. The UDA corresponds to land within the County's urban services boundary (USB); and...

  6. Diversity of Methicillin-Resistant Staphylococcus aureus Strains Isolated from Residents of 26 Nursing Homes in Orange County, California

    PubMed Central

    Hudson, Lyndsey O.; Reynolds, Courtney; Spratt, Brian G.; Enright, Mark C.; Quan, Victor; Kim, Diane; Hannah, Paul; Mikhail, Lydia; Alexander, Richard; Moore, Douglas F.; Godoy, Daniel; Bishop, Cynthia J.

    2013-01-01

    Nursing homes represent a unique and important methicillin-resistant Staphylococcus aureus (MRSA) reservoir. Not only are strains imported from hospitals and the community, strains can be transported back into these settings from nursing homes. Since MRSA bacteria are prevalent in nursing homes and yet relatively poorly studied in this setting, a multicenter, regional assessment of the frequency and diversity of MRSA in the nursing home reservoir was carried out and compared to that of the MRSA from hospitals in the same region. The prospective study collected MRSA from nasal swabbing of residents of 26 nursing homes in Orange County, California, and characterized each isolate by spa typing. A total of 837 MRSA isolates were collected from the nursing homes. Estimates of admission prevalence and point prevalence of MRSA were 16% and 26%, respectively. The spa type genetic diversity was heterogeneous between nursing homes and significantly higher overall (77%) than the diversity in Orange County hospitals (72%). MRSA burden in nursing homes appears largely due to importation from hospitals. As seen in Orange County hospitals, USA300 (sequence type 8 [ST8]/t008), USA100 (ST5/t002), and a USA100 variant (ST5/t242) were the dominant MRSA clones in Orange County nursing homes, representing 83% of all isolates, although the USA100 variant was predominant in nursing homes, whereas USA300 was predominant in hospitals. Control strategies tailored to the complex problem of MRSA transmission and infection in nursing homes are needed in order to minimize the impact of this unique reservoir on the overall regional MRSA burden. PMID:24025901

  7. Farm Mechanization And Labor Stabilization. Part II In A Series On Technological Change And Farm Labor Use, Kern County, California, 1961. Research Report No. 280.

    ERIC Educational Resources Information Center

    Metzler, William H.

    A stratified random sample of 69 6 workers in 361 households in Kern County, California, was selected to investigate the changes in labor use resulting from farm mechanization, and to explore the trend towards a stable labor force. Some major findings were: (1) Mechanization of the cotton harvest has erased the high peak of seasonal farm labor,…

  8. Digital Compilation of "Preliminary Map of Landslide Deposits in Santa Cruz County, California, By Cooper-Clark and Associates, 1975": A Digital Map Database

    USGS Publications Warehouse

    Report by Roberts, Sebastian; Barron, Andrew D.; Preface by Brabb, Earl E.; Pike, Richard J.

    1998-01-01

    A 1:62,500-scale black-and-white map identifying some 2,000 landslides of various types in Santa Cruz County, California, has been converted to a digital-map database that can be acquired from the U.S. Geological Survey over the Internet or on magnetic tape.

  9. Documentation of model input and output values for the geohydrology and mathematical simulation of the Pajaro Valley aquifer system, Santa Cruz and Monterey counties, California

    USGS Publications Warehouse

    Mitten, H.T.; Londquist, C.J.

    1990-01-01

    This report contains listings of the model input and sample output for simulation of the Pajaro Valley aquifer system, Santa Cruz and Monterey Counties, California. The files are contained on a 5 1/4-inch diskette. The decompressed files require approximately 5.3 megabytes of disk space on an IBM-compatible microcomputer. (USGS)

  10. The Farm Worker In A Changing Agriculture. Part I In A Series On Technological Change And Farm Labor Use, Kern County, California, 1961. Research Report No. 277.

    ERIC Educational Resources Information Center

    Metzler, William H.

    To investigate the effect of technological change upon farm labor use, a stratified random sample of 696 farm workers from a population of 12,215 in Kern County, California, provided a basis for analysis. Some major findings were: (1) The high peak of seasonal labor use has been eliminated, (2) The need for migratory labor is decreasing, (3)…

  11. A Study of the Job Satisfaction of Special Education Local Plan Area (SELPA) Directors and Local School District Special Education Directors in Four Counties of Southern California

    ERIC Educational Resources Information Center

    Alexander, Gregory Haynes, III

    2009-01-01

    Purpose. The purpose of this study was to compare the perceived level of job satisfaction of SELPA directors with that of local school district special education directors in the counties of Riverside, San Bernardino, San Diego, and Orange of Southern California and to identify factors that contribute to their job satisfaction. Additionally, this…

  12. Treating Drug-Abusing Offenders: Initial Findings from a Five-County Study on the Impact of California's Proposition 36 on the Treatment System and Patient Outcomes

    ERIC Educational Resources Information Center

    Hser, Yih-Ing; Teruya, Cheryl; Evans, Elizabeth A.; Longshore, Douglas; Grella, Christine; Farabee, David

    2003-01-01

    Five counties (Kern, Riverside, Sacramento, San Diego, San Francisco) that demonstrate both variations and similarities in their implementation of Proposition 36 (e.g., treatment approaches, urine testing) and patient mix have been selected to participate in a study assessing how California's Proposition 36 is affecting the drug treatment system…

  13. Recent trends in hormone therapy utilization and breast cancer incidence rates in the high incidence population of Marin County, California

    PubMed Central

    2010-01-01

    Background Recent declines in invasive breast cancer have been reported in the US, with many studies linking these declines to reductions in the use of combination estrogen/progestin hormone therapy (EPHT). We evaluated the changing use of postmenopausal hormone therapy, mammography screening rates, and the decline in breast cancer incidence specifically for Marin County, California, a population with historically elevated breast cancer incidence rates. Methods The Marin Women's Study (MWS) is a community-based, prospective cohort study launched in 2006 to monitor changes in breast cancer, breast density, and personal and biologic risk factors among women living in Marin County. The MWS enrolled 1,833 women following routine screening mammography between October 2006 and July 2007. Participants completed a self-administered questionnaire that included items regarding historical hormone therapy regimen (estrogen only, progesterone only, EPHT), age of first and last use, total years of use, and reason(s) for stopping, as well as information regarding complementary hormone use. Questionnaire items were analyzed for 1,083 non-Hispanic white participants ages 50 and over. Breast cancer incidence rates were assessed overall and by tumor histology and estrogen receptor (ER) status for the years 1990-2007 using data from the Northern California Surveillance, Epidemiology and End Results (SEER) cancer registry. Results Prevalence of EPHT use among non-Hispanic white women ages 50 and over declined sharply from 21.2% in 1998 to 6.7% by 2006-07. Estrogen only use declined from 26.9% in 1998 to 22.4% by 2006-07. Invasive breast cancer incidence rates declined 33.4% between 2001 and 2004, with drops most pronounced for ER+ cancers. These rate reductions corresponded to declines of about 50 cases per year, consistent with population attributable fraction estimates for EPHT-related breast cancer. Self-reported screening mammography rates did not change during this period. Use of

  14. 75 FR 39705 - Notice of Temporary Closures on Public Lands in Northwestern Elko County, NV

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-12

    ... Office, Elko, Nevada within the Owyhee, Rock Creek, and Little Humboldt Wild Horse Herd Management Areas... effect on the Owyhee, Rock Creek and Little Humboldt Wild Horse HMAs from 12:01 a.m. PST on Tuesday, July... Horse HMAs in Elko County, Nevada. The legal description of the affected public lands is: Mount...

  15. Lyme disease in northwestern coastal California.

    PubMed Central

    Ley, C; Davila, I H; Mayer, N M; Murray, R A; Rutherford, G W; Reingold, A L

    1994-01-01

    To determine the incidence of physician-diagnosed Lyme disease in an endemic area of California, an active surveillance program was implemented in Lake, Mendocino, Sonoma, and southern Humboldt counties. More than 200 medical care providers were called monthly for their list of suspected cases of Lyme disease. Pertinent information was abstracted from the medical record of each patient. Of 153 cases of possible early Lyme disease ascertained from July 1991 to December 1992, 37% consisted of physician-diagnosed erythema migrans. Only 58% of erythema migrans rashes were at least 5 cm in diameter. An additional 43 patients had suspicious rashes not classified as erythema migrans. Of 166 patients with possible late-stage Lyme disease, 31% had specific clinical symptoms and 75% had a positive serologic test. With an incident case defined as physician-diagnosed erythema migrans of at least 5 cm in diameter, the annual incidence of Lyme disease in northwestern coastal California according to active surveillance only was 5.5 per 100,000. The rate of Lyme disease in California is substantially lower than that in the Atlantic northeastern United States. Many suspected cases of Lyme disease in this endemic area do not meet surveillance criteria, which are intentionally restrictive. Although some of the illnesses not meeting surveillance criteria may be due to infection with Borrelia burgdorferi, it appears that Lyme disease is being overdiagnosed in this area. Images PMID:8053175

  16. Five-year resurvey for endangered species on Naval Petroleum Reserve No. 1 (Elk Hills), Kern County, California

    SciTech Connect

    O'Farrell, T.P.; Mathews, N.E.

    1987-09-01

    A transect survey of Naval Petroleum Reserve No. 1 (NPR-1), Kern County, California, was conducted in 1984 to determine the distribution and relative abundance of endangered species and other wildlife. A total of 589.8 miles of transects were walked through approximately 47,235 acres in all or parts of 81 sections. A total of 16,401 observations of 58 species of wildlife were made which demonstrated the richness and abundance of wildlife on NPR-1 in spite of the intensity of recent petroleum developments. Although most construction activities associated with increased petroleum production took place between the first transect survey in 1979 and this resurvey, no adverse changes in relative densities of kit fox dens, prey base, or other wildlife were observed. NPR-1 should be resurveyed again in 1989. 33 refs., 5 figs., 13 tabs.

  17. Oiled seabird rescue at the J.V. Fitzgerald Marine Reserve, San Mateo County, California, 1968-1995

    USGS Publications Warehouse

    Carter, H.R.

    1997-01-01

    Records of oiled and injured seabirds at the J.V. Fitzgerald Marine Reserve, San Mateo County, California, were collated from the daily log at the Reserve for the period 1968-1995. These records serve to demonstrate that oil spills and chronic oiling have occurred frequently in this area, just south of San Francisco. Common Murres (Uria aalge) were the most frequently-oiled species rescued at the Reserve. Greater efforts should be made by wildlife rehabilitators to collate large volumes of past data (prior to the early 1990s) on oiled and injured seabirds for similar documentation of large or moderate oil spills (including undocumented or poorly-known spills), chronic oiling from small spills, and injuries from other sources.

  18. Public health assessment for Frontier Fertilizer, Davis, Yolo County, California, Region 9. Cerclis No. CAD071530380. Final report

    SciTech Connect

    1995-11-27

    The Frontier Fertilizer site is located near the eastern boundary of the City of Davis, in Yolo County, California. Two separate pesticide sales companies operated at the site from 1971 and 1987. Disposal of waste water and unused agricultural chemicals by these companies into an unlined basin on the property from approximately 1972 until 1983 have caused soils and groundwater contamination. In the area beneath the unlined basin, the principal contaminants of concern include dibromochloropropane (DBCP), 1,2-dichloropropane (1,2-DCP), and ethylene dibromide (EDB). Another contaminant of concern is carbon tetrahchloride, however, the source of contamination is unknown. Although much of the soil contamination was removed from the site in 1985, sampling since then indicates that substantial subsurface soil contamination still exists. An interim groundwater extraction and treatment system has been in operation at the site since January 1994.

  19. Determination of channel capacity of the Sacramento River between Ordbend and Glenn, Butte and Glenn counties, California

    USGS Publications Warehouse

    Simpson, R.G.

    1976-01-01

    The adequacy of an 8.5-mi reach of the Sacramento River to carry flood flows is evaluated. The reach studied is in Butte and Glenn Counties, California, and extends northward from the present east-bank Sacramento River Flood Control Project levee near Glenn upstream to the Ord Ferry gaging station near Ordbend. There is a west-bank levee throughout the study reach. Flows analyzed range from 11,500 to 265,000 cfs. Computed water-surface elevations are based on topography obtained during September through November 1974. The present Sacramento River Flood Control Project levees at the downstream end of the study reach near Glenn are designed to contain flows up to 150,000 cfs. Water-surface elevations computed for flows of this magnitude are about 6 to 8 ft below the top of the existing west-bank levee throughout the study reach. (Woodard-USGS)

  20. Cone penetration tests and soil borings at the Mason Road site in Green Valley, Solano County, California

    USGS Publications Warehouse

    Bennett, Michael J.; Noce, Thomas E.; Lienkaemper, James J.

    2011-01-01

    In support of a study to investigate the history of the Green Valley Fault, 13 cone penetration test soundings and 3 auger borings were made at the Mason Road site in Green Valley, Solano County, California. Three borings were made at or near two of the cone penetration test soundings. The soils are mostly clayey with a few sandy layers or lenses. Fine-grained soils range from low plasticity sandy lean clay to very plastic fat clay. Lack of stratigraphic correlation in the subsurface prevented us from determining whether any channels had been offset at this site. Because the soils are generally very clayey and few sand layers or lenses are loose, the liquefaction potential at the site is very low.

  1. Demographic factors associated with perceptions about water safety and tap water consumption among adults in Santa Clara County, California, 2011.

    PubMed

    van Erp, Brianna; Webber, Whitney L; Stoddard, Pamela; Shah, Roshni; Martin, Lori; Broderick, Bonnie; Induni, Marta

    2014-01-01

    The objective of this study was to examine differences in tap water consumption and perceptions of bottle versus tap water safety for Hispanics and non-Hispanic whites, as well as associations with other demographic characteristics. Data are from the Santa Clara County, California, Dietary Practices Survey (2011; N = 306). We used logistic regression to examine associations between demographic characteristics and 1) perceptions that bottled water is safer than tap and 2) primarily consuming tap water. Hispanics were less likely than non-Hispanic whites to primarily drink tap water (OR = 0.33; 95% CI, 0.11-0.99), although there was no significant difference in perceptions that bottled water is safer between these groups (OR = 0.50; 95% CI, 0.11-2.27). Hispanics may be an important population for interventions promoting tap water consumption. PMID:24921901

  2. Health assessment for Sharpe Army Depot, Lathrop, San Joaquin County, California, Region 9. CERCLIS No. CA8210020832. Preliminary report

    SciTech Connect

    Not Available

    1989-04-14

    The Sharpe Army Depot (SHAD), consisting of 720 acres located in San Joaquin County, California, is on the National Priorities List. The site has served as a storage, receiving, packaging, and shipping facility since 1941. In the late 1940s the Depot also served as a maintenance facility for heavy equipment. Available data indicate that the primary contaminant sources are associated with past heavy equipment and aircraft-maintenance operations. Contaminants associated with SHAD include trichloroethene, arsenic, selenium, and bromacil (a herbicide). The site is considered to be of potential public health concern because of the risk to human health caused by the possibility of exposure to hazardous substances via ingestion, dermal contact, or inhalation of contaminants in ground water, subsurface soil, soil-gas, and food-chain entities.

  3. Remote sensing research for agricultural applications. [San Joaquin County, California and Snake River Plain and Twin Falls area, Idaho

    NASA Technical Reports Server (NTRS)

    Colwell, R. N. (Principal Investigator); Wall, S. L.; Beck, L. H.; Degloria, S. D.; Ritter, P. R.; Thomas, R. W.; Travlos, A. J.; Fakhoury, E.

    1984-01-01

    Materials and methods used to characterize selected soil properties and agricultural crops in San Joaquin County, California are described. Results show that: (1) the location and widths of TM bands are suitable for detecting differences in selected soil properties; (2) the number of TM spectral bands allows the quantification of soil spectral curve form and magnitude; and (3) the spatial and geometric quality of TM data allows for the discrimination and quantification of within field variability of soil properties. The design of the LANDSAT based multiple crop acreage estimation experiment for the Idaho Department of Water Resources is described including the use of U.C. Berkeley's Survey Modeling Planning Model. Progress made on Peditor software development on MIDAS, and cooperative computing using local and remote systems is reported as well as development of MIDAS microcomputer systems.

  4. Health Care–Associated Infection Outbreak Investigations in Outpatient Settings, Los Angeles County, California, USA, 2000−2012

    PubMed Central

    Coelho, Laura; Bancroft, Elizabeth; Terashita, Dawn

    2015-01-01

    Health care services are increasingly delivered in outpatient settings. However, infection control oversight in outpatient settings to ensure patient safety has not improved and literature quantifying reported health care–associated infection outbreaks in outpatient settings is scarce. The objective of this analysis was to characterize investigations of suspected and confirmed outbreaks in outpatient settings in Los Angeles County, California, USA, reported during 2000–2012, by using internal logs; publications; records; and correspondence of outbreak investigations by characteristics of the setting, number, and type of infection control breaches found during investigations, outcomes of cases, and public health responses. Twenty-eight investigations met the inclusion criteria. Investigations occurred frequently, in diverse settings, and required substantial public health resources. Most outpatient settings investigated had >1 infection control breach. Lapses in infection control were suspected to be the outbreak source for 16 of the reviewed investigations. PMID:26196293

  5. Data for ground-water test holes in Fresno County, western San Joaquin Valley, California, June to August 1985

    USGS Publications Warehouse

    Beard, Sherrill; Laudon, Julie

    1988-01-01

    Twenty-four test holes were drilled from June 3 to August 29, 1985, in the western San Joaquin Valley, California, to provide information about groundwater hydraulics and geochemistry. The study area is in western Fresno County, west of the San Joaquin River, and east of the Coast Range. Lithologic, hydrologic, and geophysical data were collected from test holes drilled at two cluster sites and at 13 additional sites. Both cluster sites have five cased test holes. A sixth test hole was drilled at one of the cluster sites but was destroyed. Each of the 10 cased test holes is perforated at a different 10-ft depth interval. Six of the 13 additional test holes were also cased. Lithology logs were constructed from descriptions of cuttings and cores recovered during drilling. Geophysical logs were made of the deepest hole at each cluster site. Initial water level measurements were made at most sites. (Author 's abstract)

  6. Mesocarnivore Surveys on Lawrence Livermore National Laboratory Site 300, Alameda and San Joaquin Counties, California

    SciTech Connect

    Clark, H O; Smith, D A; Cypher, B L; Kelly, P A; Woollett, J S

    2004-11-16

    Lawrence Livermore National Laboratory (LLNL), operated under cooperative agreement between the University of California and the U. S. Department of Energy, administers and operates an approximately 11 mi{sup 2} (28 km{sup 2}) test site in the remote hills at the northern end of the South Coast Ranges of Central California (Figure 1). Known as Site 300, this expanse of rolling hills and canyons supports a diverse array of grassland communities typical of lowland central California. The facility serves a variety of functions related to testing non-nuclear explosives, lasers, and weapons subsystems. The primary purpose of this project was to determine the presence of any mesocarnivores on Site 300 that use the property for foraging, denning, and other related activities. The surveys occurred from mid-September to mid-October, 2002.

  7. Cascadia Earthquake and Tsunami Scenario for California's North Coast

    NASA Astrophysics Data System (ADS)

    Dengler, L.

    2006-12-01

    In 1995 the California Division of Mines and Geology (now the California Geological Survey) released a planning scenario for an earthquake on the southern portion of the Cascadia subduction zone (CSZ). This scenario was the 8th and last of the Earthquake Planning Scenarios published by CDMG. It was the largest magnitude CDMG scenario, an 8.4 earthquake rupturing the southern 200 km of the CSZ, and it was the only scenario to include tsunami impacts. This scenario event has not occurred in historic times and depicts impacts far more severe than any recent earthquake. The local tsunami hazard is new; there is no written record of significant local tsunami impact in the region. The north coast scenario received considerable attention in Humboldt and Del Norte Counties and contributed to a number of mitigation efforts. The Redwood Coast Tsunami Work Group (RCTWG), an organization of scientists, emergency managers, government agencies, and businesses from Humboldt, Mendocino, and Del Norte Counties, was formed in 1996 to assist local jurisdictions in understanding the implications of the scenario and to promote a coordinated, consistent mitigation program. The group has produced print and video materials and promoted response and evacuation planning. Since 1997 the RCTWG has sponsored an Earthquake Tsunami Education Room at county fairs featuring preparedness information, hands-on exhibits and regional tsunami hazard maps. Since the development of the TsunamiReady Program in 2001, the RCTWG facilitates community TsunamiReady certification. To assess the effectiveness of mitigation efforts, five telephone surveys between 1993 and 2001 were conducted by the Humboldt Earthquake Education Center. A sixth survey is planned for this fall. Each survey includes between 400 and 600 respondents. Over the nine year period covered by the surveys, the percent with houses secured to foundations has increased from 58 to 80 percent, respondents aware of a local tsunami hazard increased

  8. The impact of Medicaid managed care on community clinics in Sacramento County, California.

    PubMed Central

    Korenbrot, C C; Miller, G; Greene, J

    1999-01-01

    OBJECTIVES: The purpose of this study was to determine the impact of countywide Medicaid managed care on service use at community clinics. METHODS: Clinic use before and after introduction of Medicaid plans in one county was compared with that in a group of comparable counties without such plans. RESULTS: There were significant declines of 40% to 45% in the volumes of Medicaid clients, encounters, and revenues at clinics with the introduction of Medicaid plans. Declines of 23% in uninsured clients and encounters did not differ significantly. CONCLUSIONS: The introduction of Medicaid managed care with multiple commercial plans can have significant negative effects on nonprofit community clinics. PMID:10358686

  9. Surficial and bedrock geologic map database of the Kelso 7.5 Minute quadrangle, San Bernardino County, California

    USGS Publications Warehouse

    Bedford, David R.

    2003-01-01

    This geologic map database describes geologic materials for the Kelso 7.5 Minute Quadrangle, San Bernardino County, California. The area lies in eastern Mojave Desert of California, within the Mojave National Preserve (a unit of the National Parks system). Geologic deposits in the area consist of Proterozoic metamorphic rocks, Cambrian-Neoproterozoic sedimentary rocks, Mesozoic plutonic and hypabyssal rocks, Tertiary basin fill, and Quaternary surficial deposits. Bedrock deposits are described by composition, texture, and stratigraphic relationships. Quaternary surficial deposits are classified into soil-geomorphic surfaces based on soil characteristics, inset relationships, and geomorphic expression. The surficial geology presented in this report is especially useful to understand, and extrapolate, physical properties that influence surface conditions, and surface- and soil-water dynamics. Physical characteristics such as pavement development, soil horizonation, and hydraulic characteristics have shown to be some of the primary drivers of ecologic dynamics, including recovery of those ecosystems to anthropogenic disturbance, in the eastern Mojave Desert and other arid and semi-arid environments.

  10. Summary and evaluation of the coyote control program on Naval Petroleum Reserve No. 1, Kern County, California, 1987

    SciTech Connect

    Scrivner, J.H.

    1987-09-01

    For the third consecutive year (1987) the US Department of Energy (DOE) funded a coyote (Canis latrans) control program in an attempt to reduce coyote predation on the endangered San Joaquin kit fox (Vulpes macrotis mutica) on Naval Petroleum Reserve No. 1 (NPR-1, Elk Hills) in Kern County, California. During approximately 8 weeks of control activities, personnel from the US Department of Agriculture, Division of Animal Damage Control (ADC), removed 16 adult coyotes: 14 were trapped, 2 were shot. Data were gathered on standard measurements, weights, ages, and reproductive condition. No kit foxes were accidently trapped. Based on the results of canid scent-station surveys, the coyote population on NPR-1 declined and the kit fox population was relatively stable. Recommendations were made to conduct the 1987/1988 coyote control program between December 1987 and February 1988, use helicopters for aerial gunning and locating coyote dens, and develop a cooperative agreement between DOE, ADC, US Fish and Wildlife Service, Bureau of Land Management, and the California Department of Fish and Game to conduct the coyote control program on lands surrounding NPR-1 owned by DOE and others. 8 refs., 2 figs., 2 tabs.

  11. Survey for least bell's vireo in riparian habitat on Vandenberg Air Force Base, Santa Barbara County, California

    NASA Technical Reports Server (NTRS)

    Breininger, David R.

    1988-01-01

    The least bell's vireo (Vireo bellii pusillus) was listed in 1986 as an endangered species by the U.S. Fish and Wildlife Service. Because of the possibility of the species existing on Vandenberg Air Force Base (VAFB), this survey was conducted to determine if they exist, and if so to prepare a distribution map of the species on the base. Major riparian areas were surveyed on foot for 17 days in April, May, and July 1987. No least bell's vireo were sighted; based on past studies, it is unlikely that there is a significant population on VAFB. There are, however, at least 13 other species of special concern that inhabit VAFB riparian woodlands. Most of these species have declined along the south coast of Santa Barbara County, and many have declined in much of the southern half of California. Riparian areas on VAFB are an important environmental resource for the southern half of California; many of these areas, however, show signs of degradation.

  12. California County Data Book, 1999: How Our Youngest Children Are Faring.

    ERIC Educational Resources Information Center

    Children Now, Oakland, CA.

    This Kids Count Data Book examines trends in the well-being of California's children, focusing on factors influencing young children. This statistical portrait is based on trends in 19 indicators of child well-being in four areas: (1) family economics, including child poverty rate, children receiving TANF, children receiving WIC, fair market rent,…

  13. Geohydrology and water chemistry in the Rialto-Colton Basin, San Bernardino County, California

    USGS Publications Warehouse

    Woolfenden, Linda R.; Kadhim, Dina

    1997-01-01

    The 40-square-mile Rialto-Colton ground- water basin is in western San Bernardino County, California, about 60 miles east of Los Angeles.This basin was chosen for storage of imported water because of the good quality of native ground water, the known capacity for additional ground-water storage in the basin, and the availability of imported water. Because the movement and mixing of imported water needed to be determined, the San Bernardino Valley Municipal Water District entered into a cooperative program with the U.S.Geological Survey in 1991 to study the geohydrology and water chemistry in the Rialto- Colton basin. Ground-water flow and chemistry were investigated using existing data, borehole- geophysical and lithologic logs from newly drilled test holes, measurement of water levels, and chemical analyses of water samples. The Rialto-Colton basin is bounded on the northwest and southeast by the San Gabriel Mountains and the Badlands, respectively. The San Jacinto Fault and Barrier E form the northeastern boundary, and the Rialto-Colton Fault forms the southwestern boundary. Except in the southeastern part of the basin, the San Jacinto and Rialto-Colton Faults act as groundwater barriers that impede ground- water flow into and out of the basin.Barrier E generally does not impede ground- water flow into the basin. The ground-water system consists primarily of gravel, sand, silt, and clay. The maximum thickness is greater than 1,000 feet. The ground- water system is divided into four water-bearing units: river-channel deposits, and upper, middle, and lower water-bearing units. Relatively impermeable consolidated deposits underlie the lower water- bearing unit and form the lower boundary of the ground- water system. Ground water moves from east to west in the river-channel deposits and upper water-bearing unit in the southeastern part of the basin, and from northwest to southeast in the middle and lower water-bearing units. Two major internal faults, Barrier J and

  14. 78 FR 896 - Revisions to the California State Implementation Plan, Imperial County Air Pollution Control...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-01-07

    ... is finalizing approval of revisions to the Imperial County Air Pollution Control District (ICAPCD... IV. Statutory and Executive Order Reviews I. Proposed Action On April 27, 2012 (77 FR 25109), EPA... and Budget under Executive Order 12866 (58 FR 51735, October 4, 1993); does not impose an...

  15. 78 FR 23677 - Revisions to the California State Implementation Plan, Imperial County Air Pollution Control...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-04-22

    ... is finalizing approval of revisions to the Imperial County Air Pollution Control District (ICAPCD... III. EPA Action IV. Statutory and Executive Order Reviews I. Proposed Action On January 7, 2013 (78 FR... not acting on Rule 802 at this time. \\2\\ See, e.g., 75 FR 8010 (February 23, 2010). Comment...

  16. 76 FR 7142 - Revisions to the California State Implementation Plan, Imperial County Air Pollution Control...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-02-09

    ...: EPA is proposing to approve revisions to the Imperial County Air Pollution Control District (ICAPCD... versions of these rules? We approved an earlier version of Rule 201 into the SIP on January 3, 2007 (72 FR... permit exemptions. Rule 103 was approved into the SIP on May 31, 1972 (37 FR 10842). The...

  17. 77 FR 25109 - Revisions to the California State Implementation Plan, Imperial County Air Pollution Control...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-04-27

    ... Implementation of Title I of the Clean Air Act Amendments of 1990,'' 59 FR 41998 (August 16, 1994). 5. ``PM-10...: EPA is proposing to approve revisions to the Imperial County Air Pollution Control District (ICAPCD...-2008 monitoring period (74 FR 63309). This determination suspended some of the planning...

  18. 78 FR 922 - Revisions to the California State Implementation Plan, Imperial County Air Pollution Control...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-01-07

    ... for the Implementation of Title I of the Clean Air Act Amendments of 1990,'' 57 FR 13498 (April 16... Preamble for the Implementation of Title I of the Clean Air Act Amendments of 1990,'' 59 FR 41998 (August...: EPA is proposing to approve revisions to the Imperial County Air Pollution Control District...

  19. 75 FR 56889 - Revisions to the California State Implementation Plan, San Diego County Air Pollution Control...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-17

    ...: EPA is taking direct final action to approve revisions to the San Diego County Air Pollution Control... earlier version of Rule 2 into the SIP on February 3, 2000 (65 FR 5262). C. What is the purpose of the... Federalism (64 FR 43255, August 10, 1999) revokes and replaces Executive Orders 12612 (Federalism) and...

  20. Sediment transport and deposition, Walnut and Pacheco Creeks, Contra Costa County, California, August 1965-April 1970

    USGS Publications Warehouse

    Porterfield, George

    1972-01-01

    Average annual sediment discharge in Pacheco Creek basin, Contra Costa County, Calif., was larger during August 1965-April 1970 than the historical annual sediment discharge (1909-62) by a factor of about 1.3. This increas in sediment discharge is attributed primarily to an increased frequency of peak streamflows and to a larger average annual streamflow during the 1965-70 period.

  1. 75 FR 39365 - Revisions to the California State Implementation Plan, Imperial County Air Pollution Control...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-08

    ... minimis level. Id. at 42011. \\19\\ 75 FR 8008, 8010, and proposal TSD, pp. 5-7. Open areas: --Windblown... Order Reviews I. Summary of Proposed Action On February 23, 2010 (75 FR 8008), EPA proposed a limited... section E.6 for recreational use of public lands in Imperial County. \\6\\ 75 FR 8008, 8010-8011 and...

  2. 76 FR 67396 - Revisions to the California State Implementation Plan, Placer County Air Pollution Control District

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-11-01

    ... Control District AGENCY: Environmental Protection Agency (EPA). ACTION: Proposed rule. SUMMARY: EPA is proposing to approve revisions to the Placer County Air Pollution Control District (PCAPCD) and Sacramento... commercial boilers, stationary internal combustion engines and water heaters. We are proposing to...

  3. Ground-Water Quality Data in the Kern County Subbasin Study Unit, 2006 - Results from the California GAMA Program

    USGS Publications Warehouse

    Shelton, Jennifer L.; Pimentel, Isabel; Fram, Miranda S.; Belitz, Kenneth

    2008-01-01

    Ground-water quality in the approximately 3,000 square-mile Kern County Subbasin study unit (KERN) was investigated from January to March, 2006, as part of the Priority Basin Assessment Project of the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The GAMA Priority Basin Assessment project was developed in response to the Groundwater Quality Monitoring Act of 2001, and is being conducted by the California State Water Resources Control Board (SWRCB) in collaboration with the U.S. Geological Survey (USGS) and the Lawrence Livermore National Laboratory (LLNL). The Kern County Subbasin study was designed to provide a spatially unbiased assessment of raw (untreated) ground-water quality within KERN, as well as a statistically consistent basis for comparing water quality throughout California. Samples were collected from 50 wells within the San Joaquin Valley portion of Kern County. Forty-seven of the wells were selected using a randomized grid-based method to provide a statistical representation of the ground-water resources within the study unit. Three additional wells were sampled to aid in the evaluation of changes in water chemistry along regional ground-water flow paths. The ground-water samples were analyzed for a large number of man-made organic constituents (volatile organic compounds [VOCs], pesticides, and pesticide degradates), constituents of special interest (perchlorate, N-nitrosodimethylamine [NDMA], and 1,2,3-trichloropropane [1,2,3-TCP]), naturally occurring inorganic constituents (nutrients, major and minor ions, and trace elements), radioactive constituents, and microbial indicators. Naturally occurring isotopes (tritium, carbon-14, and stable isotopes of hydrogen, oxygen, nitrogen, and carbon) and dissolved noble gases also were measured to help identify the source and age of the sampled ground water. Quality-control samples (blanks, replicates, and laboratory matrix spikes) were collected and analyzed at approximately 10 percent of

  4. 76 FR 78717 - Notice of Final Federal Agency Actions on Proposed Highway in California

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-12-19

    ... the Mendocino County line to 2.2 miles north of the Mendocino County line in the County of Humboldt... limit is from 1.1 mile north of the Mendocino County line to 2.2 miles north of the Mendocino...

  5. Final record of decision/remedial action plan, nine sites, Sierra Army Depot, Lassen County, California

    SciTech Connect

    Arroyo, S.L.; Larson, A.M.; Parent, M.M.; Silvers, J.M.; Weaverling, P.H.

    1996-10-01

    This ROD/RAP presents the selected response actions for nine sites at SIAD. The response actions were selected by the US Department of the Army (Army) in accordance with the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), as amended by the Superfund Amendments Reauthorization Act of 1986 (SARA)(collectively referred to as CERCLA), the National Oil and Hazardous Substances Pollution Contingency Plan (NCP), and Section 6.8 of the California Health and Safety Code. This ROD/RAP includes the factual and legal basis for selecting the response action at each of the nine sites listed above. The data used to support the selected response action are contained in the Administrative Record for each site. The State of California as represented by the Department of Toxic Substances Control (DTSC), and the Lahontan Regional Water Quality Control Board (RWQCB) concur with the selected response action at each site.

  6. Aerial geologic log from Livermore, California to the Nevada Test Site, Nye County, Nevada

    NASA Astrophysics Data System (ADS)

    Wagoner, J. L.

    1982-01-01

    Some geologic and cultural points of interest along Lawrence Livermore National Laboratory's F-27 flight between Livermore, California, and the Nevada Test Site, Navada are outlined. A geologic history is given for each of the four geologic provinces. Approximately 60 air photos are included which will help the traveler identify specific geologic features. Geologic cross sections of the area from Livermore Valley to Gold Mountain describe the geologic structure across the geologic provinces. A LANDSAT mosaic of the flight path is also included.

  7. Mineral resources of the Santa Rose Mountains Wilderness Study Area, Riverside County, California

    SciTech Connect

    Calzia, J.P.; Madden-McGuire, D.J.; Oliver, H.W.; Schreiner, R.A.

    1988-01-01

    The Santa Rosa Mountains Wilderness Study Area covers 68,051 acres in the Santa Rose Mountains, California. An appraisal of the mineral resources (known) and an assessment of mineral resource potential (undiscovered) of this wilderness study area were made at the request of the US Bureau of Land Management. Geologic, geochemical, geophysical, and mineral surveys indicate that the study area has high potential for tungsten and marble resources, moderate potential for gold, and no potential for oil, natural gas, and geothermal resources.

  8. Invasive range expansion by the Humboldt squid, Dosidicus gigas, in the eastern North Pacific

    PubMed Central

    Zeidberg, Louis D.; Robison, Bruce H.

    2007-01-01

    A unique 16-year time series of deep video surveys in Monterey Bay reveals that the Humboldt squid, Dosidicus gigas, has substantially expanded its perennial geographic range in the eastern North Pacific by invading the waters off central California. This sustained range expansion coincides with changes in climate-linked oceanographic conditions and a reduction in competing top predators. It is also coincident with a decline in the abundance of Pacific hake, the most important commercial groundfish species off western North America. Recognizing the interactive effects of multiple changes in the environment is an issue of growing concern in ocean conservation and sustainability research. PMID:17646649

  9. Invasive range expansion by the Humboldt squid, Dosidicus gigas, in the eastern North Pacific.

    PubMed

    Zeidberg, Louis D; Robison, Bruce H

    2007-07-31

    A unique 16-year time series of deep video surveys in Monterey Bay reveals that the Humboldt squid, Dosidicus gigas, has substantially expanded its perennial geographic range in the eastern North Pacific by invading the waters off central California. This sustained range expansion coincides with changes in climate-linked oceanographic conditions and a reduction in competing top predators. It is also coincident with a decline in the abundance of Pacific hake, the most important commercial groundfish species off western North America. Recognizing the interactive effects of multiple changes in the environment is an issue of growing concern in ocean conservation and sustainability research. PMID:17646649

  10. Potential for Induced Seismicity Related to the Northern California CO2 Reduction Project Pilot Test, Solano County, California

    SciTech Connect

    Myer, L.; Chiaramonte, L.; Daley, T.M.; Wilson, D.; Foxall, W.; Beyer, J.H.

    2010-06-15

    The objective of this technical report is to analyze the potential for induced seismicity due to a proposed small-scale CO{sub 2} injection project in the Montezuma Hills. We reviewed currently available public information, including 32 years of recorded seismic events, locations of mapped faults, and estimates of the stress state of the region. We also reviewed proprietary geological information acquired by Shell, including seismic reflection imaging in the area, and found that the data and interpretations used by Shell are appropriate and satisfactory for the purpose of this report. The closest known fault to the proposed injection site is the Kirby Hills Fault. It appears to be active, and microearthquakes as large as magnitude 3.7 have been associated with the fault near the site over the past 32 years. Most of these small events occurred 9-17 miles (15-28 km) below the surface, which is deep for this part of California. However, the geographic locations of the many events in the standard seismicity catalog for the area are subject to considerable uncertainty because of the lack of nearby seismic stations; so attributing the recorded earthquakes to motion along any specific fault is also uncertain. Nonetheless, the Kirby Hills Fault is the closest to the proposed injection site and is therefore our primary consideration for evaluating the potential seismic impacts, if any, from injection. Our planned installation of seismic monitoring stations near the site will greatly improve earthquake location accuracy. Shell seismic data also indicate two unnamed faults more than 3 miles east of the project site. These faults do not reach the surface as they are truncated by an unconformity at a depth of about 2,000 feet (610 m). The unconformity is identified as occurring during the Oligocene Epoch, 33.9-23.03 million years ago, which indicates that these faults are not currently active. Farther east are the Rio Vista Fault and Midland Fault at distances of about 6 miles

  11. Chemical quality of ground water in San Joaquin and part of Contra Costa Counties, California

    USGS Publications Warehouse

    Sorenson, Stephen K.

    1981-01-01

    Chemical water-quality conditions were investigated in San Joaquin and part of Contra Costa Counties by canvassing available wells and sampling water from 324 representative wells. Chemical water types varied, with 73 percent of the wells sampled containing either calcium-magnesium bicarbonate, or calcium-sodium bicarbonate type water. Substantial areas contain ground water exceeding water-quality standards for boron, manganese, and nitrate. Trace elements, with the exception of boron and manganese, were present in negligible amounts. (USGS)

  12. Effect of urban growth on streamflow regimen of Permanente Creek, Santa Clara County, California

    USGS Publications Warehouse

    Harris, E.E.; Rantz, S.E.

    1964-01-01

    This report presents the results of an investigation of the effect of urban growth on the streamflow regimen of Permanente Creek in Mountain View, Santa Clara County, Calif. The data available did not permit a complete study of all hydrologic aspects, but there is conclusive evidence that the volume of storm runoff produced by rainfall on the valley floor has increased substantially as a result of urbanization. In 1945, storm runoff from the 5.12-square mile project area was insufficient to balance channel losses, and the streamflow entering the project area in the Permanente Creek channel was greater than that leaving the area. If, however, total outflow from the project area is considered to be the sum of the streamflow leaving the area plus channel seepage in the area, the ratio of total outflow to inflow was 1:18. By 1958, storm runoff from the project area was far in excess of channel losses and the ratio of total outflow to inflow was 1:70. This increase in outflow is attributed to the fact that urban development during the period 1945 to 1958 increased the extent of impervious surface in the project area from about 4 percent to 19 percent. The effect of urban growth in other basins in Santa Clara County should be investigated before any attempt is made to project the quantitative results of this study to other areas in the county.

  13. Habitat-related variation in infestation of lizards and rodents with Ixodes ticks in dense woodlands in Mendocino County, California.

    PubMed

    Eisen, Rebecca J; Eisen, Lars; Lane, Robert S

    2004-01-01

    During the spring and early summer of 2002, we examined the relative importance of Borrelia-refractory lizards (Sceloporus occidentalis, Elgaria spp.) versus potential Borrelia burgdorferi sensu lato (s.l.)-reservoirs (rodents) as hosts for Ixodes pacificus immatures in 14 woodland areas (six oak, five mixed oak/Douglas fir, and three redwood/tanoak areas) distributed throughout Mendocino County, California. Lizards were estimated to serve as hosts for 93-98% of all larvae and > or =99.6% of all nymphs infesting lizards or rodents in oak woodlands and oak/Douglas fir sites in the southern part of the county. In redwood/tanoak woodlands and oak/Douglas fir sites in northern Mendocino County, the contribution of rodents to larval feedings reached 36-69% but lizards still accounted for 94-100% of nymphal bloodmeals. From late April to mid-June, I. pacificus larvae were recovered from 95 to 96% of lizards and dusky-footed woodrats (Neotoma fuscipes) and from 59% of Peromyscus spp. mice. In contrast, 99% of lizards but few woodrats (15%) and none of the mice were infested by nymphs. Comparisons of tick loads for 19 lizard-Peromyscus spp. mouse pairings, where the lizard and mouse were captured within 10m of each other, revealed that the lizards harbored 36 times more larvae and >190 times more nymphs than the mice. In oak woodlands, loads of I. pacificus larvae decreased from late April/early May to late June for S. occidentalis lizards but increased for Peromyscus spp. mice. We conclude that the relative utilization of Borrelia-refractory lizards, as compared to rodents, by I. pacificus larvae was far higher in dry oak woodlands than in moister habitats such as redwood/tanoak and oak/Douglas fir woodlands in northern Mendocino County. Non-lizard-infesting potential enzootic vectors of B. burgdorferi s.l. (I. angustus and I. spinipalpis) were recorded from rodents in three of six oak woodland areas, two of five oak/Douglas fir woodland areas, and two of three redwood

  14. Analytical results and sample locality map of stream-sediment, heavy-mineral-concentrate, and rock samples from Owlshead Mountains Wilderness Study Area (CDCA-156), San Bernardino County, California

    SciTech Connect

    Adrian, B.M.; Frisken, J.G.; Detra, D.E.; Hopkins, R.T.; Roemer, T.A.; Jones, J.L.

    1989-01-01

    A U.S. Geological Survey report is presented on the analytical results and sample locality map of stream-sediment, heavy-mineral-concentrate, and rock samples from Owlshead Mountains Wilderness Study Area (CDCA-156), San Bernardino County, California.

  15. Arc-rift transition volcanism in the Volcanic Hills, Jacumba and Coyote Mountains, San Diego and Imperial Counties, california

    NASA Astrophysics Data System (ADS)

    Fisch, Gregory Zane

    Neogene volcanism associated with the subduction of the Farallon-Pacific spreading center and the transition from a subduction zone to a rift zone has been studied extensively in Baja, California, Mexico. One of the main goals of these studies was to find a geochemical correlation with slab windows that may have formed during that complicated transition. While workers have been able to find distinct geochemical signatures in samples from Baja California, none have shown statistically significant correlation with samples from southern California that are thought to be related to the same arc-rift transition events. All of the basaltic samples from this study of southern California rocks have prominent Nb depletions typical of island-arc subduction-related volcanism, in contrast to the chemistry of Baja California volcanics that have trace element patterns typical of synrift related volcanism. The work done by previous investigators has been additionally complicated due to each investigator's choice of important ratios or patterns, which bears little, if any, correlation with work done by others working in the same area. For example, Martin-Barajas et al. (1995) use K/Rb ratios in their study of the Puertocitos Volcanic Province, while Castillo (2008) argues that Sr/Y vs. Y is a better indicator of petrogenetic processes. Little petrologic work has been done on Neogene volcanic rocks in the Imperial Valley and eastern San Diego County region of Southern California. This thesis combines new research with that of previous workers and attempts to establish a better understanding of the processes involved with the transition volcanism. Prior work documents significant differences in the geochemistry between some of these areas, especially those in close proximity to each other (e.g. the Volcanic Hills and Coyote Mountains). These differences were thought to be largely the result different magmatic sources. The potential of finding two differing magma types in close

  16. Preliminary maps of Quaternary deposits and liquefaction susceptibility, nine-county San Francisco Bay region, California: a digital database

    USGS Publications Warehouse

    Knudsen, Keith L.; Sowers, Janet M.; Witter, Robert C.; Wentworth, Carl M.; Helley, Edward J.; Nicholson, Robert S.; Wright, Heather M.; Brown, Katherine H.

    2000-01-01

    This report presents a preliminary map and database of Quaternary deposits and liquefaction susceptibility for the nine-county San Francisco Bay region, together with a digital compendium of ground effects associated with past earthquakes in the region. The report consists of (1) a spatial database of fivedata layers (Quaternary deposits, quadrangle index, and three ground effects layers) and two text layers (a labels and leaders layer for Quaternary deposits and for ground effects), (2) two small-scale colored maps (Quaternary deposits and liquefaction susceptibility), (3) a text describing the Quaternary map, liquefaction interpretation, and the ground effects compendium, and (4) the databse description pamphlet. The nine counties surrounding San Francisco Bay straddle the San Andreas fault system, which exposes the region to serious earthquake hazard (Working Group on California Earthquake Probabilities, 1999). Much of the land adjacent to the Bay and the major rivers and streams is underlain by unconsolidated deposits that are particularly vulnerable to earthquake shaking and liquefaction of water-saturated granular sediment. This new map provides a modern and regionally consistent treatment of Quaternary surficial deposits that builds on the pioneering mapping of Helley and Lajoie (Helley and others, 1979) and such intervening work as Atwater (1982), Helley and others (1994), and Helley and Graymer (1997a and b). Like these earlier studies, the current mapping uses geomorphic expression, pedogenic soils, and inferred depositional environments to define and distinguish the map units. In contrast to the twelve map units of Helley and Lajoie, however, this new map uses a complex stratigraphy of some forty units, which permits a more realistic portrayal of the Quaternary depositional system. The two colored maps provide a regional summary of the new mapping at a scale of 1:275,000, a scale that is sufficient to show the general distribution and relationships of

  17. Ectoparasites of Microtus californicus and Possible Emergence of an Exotic Ixodes Species Tick in California.

    PubMed

    Poulsen, Amanda; Conroy, Chris; Foley, Patrick; Ott-Conn, Caitlin; Roy, Austin; Brown, Richard; Foley, Janet

    2015-09-01

    California voles (Microtus californicus Peale) harbor fleas and ticks, may be infected with vector-borne pathogens, and could themselves suffer from disease and serve as a source of infection for people and other animals. Here we summarize publications, museum archives, and recent records of ticks and fleas from California voles. There have been 18 flea species reported on California voles with geographic locations reported for 13. During recent statewide surveys, we found six flea species, with the highest species richness in Humboldt County. We found three of five previously reported tick species as well as a tick resembling the eastern North American tick Ixodes minor Neumann (which we here designate Ixodes "Mojave morphotype") on isolated Amargosa voles and Owens Valley voles (Microtus californicus vallicola Bailey) in Inyo County in 2012 and 2014. Additional incidental observations of this Mojave morphotype tick were on a western harvest mouse (Reithrodontomys megalotis Baird) at the Mojave site and a montane vole (Microtus montanus Peale) in the Owens Valley, both in March, 2014. We cannot rule out that this tick species has been present in remote areas of California but gone unrecognized, but these data are consistent with recent introduction of this tick, possibly from migrating birds. Changes in the ectoparasite fauna suggest changing ecologies of vectors and vector-borne pathogens that could influence animals and people as well. PMID:26336217

  18. View of crater Humboldt as photographed by Apollo 15

    NASA Technical Reports Server (NTRS)

    1971-01-01

    An oblique view of the crater Humboldt as photographed by the Fairchild metric camera in the SIM bay of the Apollo 15 Command/Service Module in lunar orbit. Humboldt, which is 200 kilometers, (124 statute miles) in diameter, is located at 81 degrees east longitude and 27 degrees south latitude.

  19. AB 327 A Look At Renewable Energy in Los Angeles County, California

    NASA Astrophysics Data System (ADS)

    Schevker, Marla

    AB 327 was passed in the California State Assembly in October of 2013. This affected not only the way that investor-owned utility companies but also consumers who are interested in or have already invested in solar or other electricity efficiency efforts. This project looks at the way that AB 327 affects consumers and power companies, who supported it and who is against it and what consumers are doing to make their homes more environmentally friendly. Please note this project is intended to be viewed on the web and can be seen at: http://marla.schevker.com/marla/USC_Thesis/index.html.

  20. Mineral resources of the Tunnison Mountains Wilderness Study Area, Lassen County, California

    SciTech Connect

    Peterson, J.A.; Friskin, J.G.; Plouff, D.; Goeldner, C.A. ); Munts, S.R. )

    1988-01-01

    The part of the Tunnison Mountain Wilderness Study Area requested for mineral surveys encompasses 8,445 acres in northeastern California. The area contains Tertiary pyroclastic rocks, basaltic andesite flows, and basalt flows. There are no identified resources and it is unlikely that metallic minerals or oil and gas are present. Geothermal areas south and southwest of the study area suggest that the area may have potential for geothermal energy sources. Therefore, it has been assigned low potential for such resources; however, the mountainous geologic terrane differs from the sediment-filled valleys where the known resources are located.

  1. Mineral resources of the Tunnison Mountain Wilderness Study Area, Lassen County, California

    SciTech Connect

    Peterson, J.A.; Frisken, J.G.; Plouff, D.; Goeldner, C.A.; Munts, S.R.

    1988-01-01

    The part of the Tunnison Mountain Wilderness Study Area requested for mineral surveys encompasses 8,445 acres in northeastern California. The area contains Tertiary pyroclastic rocks, basaltic andesite flows, and basalt flows. There are no identified resources and it is unlikely that metallic minerals or oil and gas are present. Geothermal areas south and southwest of the study area suggest that the area may have potential for geothermal energy resources. Therefore, it has been assigned low potential for such resources; however, the mountainous geologic terrane differs from the sediment-filled valleys where the known resources are located.

  2. Chemical quality of ground water in Sacramento and Western Placer counties, California

    USGS Publications Warehouse

    Johnson, K.L.

    1985-01-01

    Chemical quality of groundwater was investigated in Sacramento and western Placer Counties during the summer of 1982. Chemical analyses of water samples from 209 wells indicate that the groundwater is suitable for domestic and most agricultural uses. Water from wells near the Sacramento River and a few wells near Lincoln had high concentrations of dissolved solids and some trace elements. Although chemical water types varied, 53% of the wells had a combination of calcium magnesium bicarbonate water. More than 90% of the wells sampled had water with a low to medium sodium-salinity hazard when used for irrigation. (Author 's abstract)

  3. Classification of ground-water recharge potential in three parts of Santa Cruz County, California

    USGS Publications Warehouse

    Muir, K.S.; Johnson, Michael J.

    1979-01-01

    Ground-water recharge potential was classified in the Santa Cruz coastal area, North-central area, and Soquel-Aptos area in Santa Cruz County, Calif., for three data elements that affect recharge; slope, soils, and geology. Separate numerical maps for each element were composited into a single numerical map using a classification system that ranked the numbers into areas of good , fair, and poor recharge potential. Most of the Santa Cruz coastal area and the Norht-central area have a poor recharge potential, and much of the Soquel-Aptos area has a good to fair recharge potential. (Kosco-USGS)

  4. Wilhelm von Humboldt and the "Orient": On Edward W. Said's Remarks on Humboldt's Orientalist Studies

    ERIC Educational Resources Information Center

    Messling, Markus

    2008-01-01

    From an epistemological perspective, Wilhelm von Humboldt's studies on the Oriental and East Asian languages and writing systems (Egyptian hieroglyphs, Sanskrit, Chinese, Polynesian) raise the question of his position in the Orientalist discourse of his time. Said [Said, E.W., 1978. "Orientalism. Western Conceptions of the Orient, fourth ed."…

  5. National Weather Service, Emergency Medical Services, Scripps Institution of Oceanography/UCSD and California EPA Collaboration on Heat Health Impact and Public Notification for San Diego County

    NASA Astrophysics Data System (ADS)

    Tardy, A. O.; Corcus, I.; Guirguis, K.

    2015-12-01

    The National Weather Service (NWS) has issued official heat alerts in the form of either a heat advisory or excessive heat warning product to the public and core partners for many years. This information has traditionally been developed through the use of triggers for heat indices which combine humidity and temperature. The criteria typically used numeric thresholds and did not consider impact from a particular heat episode, nor did it factor seasonality or population acclimation. In 2013, the Scripps Institution of Oceanography, University of California, San Diego in collaboration with the Office of Environmental Health Hazard Assessment, of the California Environmental Protection Agency and the NWS completed a study of heat health impact in California, while the NWS San Diego office began modifying their criteria towards departure from climatological normal with much less dependence on humidity or heat index. The NWS changes were based on initial findings from the California Department of Public Health, EpiCenter California Injury Data Online system which documents heat health impacts. Results from the UCSD study were finalized and published in 2014; they supported the need for significant modification of the traditional criteria. In order to better understand the impacts of heat on community health, medical outcome data were provided by the County of San Diego Emergency Medical Services Branch, which is charged by the County's Public Health Officer to monitor heat-related illness and injury daily from June through September. The data were combined with UCSD research to inform the modification of local NWS heat criteria and establish trigger points to pilot new procedures for the issuance of heat alerts. Finally, practices and procedures were customized for each of the county health departments in the NWS area of responsibility across extreme southwest California counties in collaboration with their Office of Emergency Services. The end result of the

  6. Emergency Assessment of Debris-Flow Hazards from Basins Burned by the 2007 Witch Fire, San Diego County, Southern California

    USGS Publications Warehouse

    Cannon, Susan H.; Gartner, Joseph E.; Michael, John A.; Bauer, Mark A.; Stitt, Susan C.; Knifong, Donna L.; McNamara, Bernard J.; Roque, Yvonne M.

    2007-01-01

    INTRODUCTION The objective of this report is to present a preliminary emergency assessment of the potential for debris-flow generation from basins burned by the Witch Fire in San Diego County, southern California in 2007. Debris flows are among the most hazardous geologic phenomena; debris flows that followed wildfires in southern California in 2003 killed 16 people and caused tens of millions of dollars of property damage. A short period of even moderate rainfall on a burned watershed can lead to debris flows. Rainfall that is normally absorbed into hillslope soils can run off almost instantly after vegetation has been removed by wildfire. This causes much greater and more rapid runoff than is normal from creeks and drainage areas. Highly erodible soils in a burn scar allow flood waters to entrain large amounts of ash, mud, boulders, and unburned vegetation. Within the burned area and downstream, the force of rushing water, soil, and rock can destroy culverts, bridges, roadways, and buildings, potentially causing injury or death. This emergency debris-flow hazard assessment is presented as relative ranking of the predicted median volume of debris flows that can issue from basin outlets in response to 2.25 inches (57.15 mm) of rainfall over a 3-hour period. Such a storm has a 10-year return period. The calculation of debris flow volume is based on a multiple-regression statistical model that describes the median volume of material that can be expected from a recently burned basin as a function of the area burned at high and moderate severity, the basin area with slopes greater than or equal to 30 percent, and triggering storm rainfall. Cannon and others (2007) describe the methods used to generate the hazard maps. Identification of potential debris-flow hazards from burned drainage basins is necessary to issue warnings for specific basins, to make effective mitigation decisions, and to help plan evacuation timing and routes.

  7. Emergency Assessment of Debris-Flow Hazards from Basins Burned by the 2007 Ammo Fire, San Diego County, Southern California

    USGS Publications Warehouse

    Cannon, Susan H.; Gartner, Joseph E.; Michael, John A.; Bauer, Mark A.; Stitt, Susan C.; Knifong, Donna L.; McNamara, Bernard J.; Roque, Yvonne M.

    2007-01-01

    INTRODUCTION The objective of this report is to present a preliminary emergency assessment of the potential for debris-flow generation from basins burned by the Ammo Fire in San Diego County, southern California in 2007. Debris flows are among the most hazardous geologic phenomena; debris flows that followed wildfires in southern California in 2003 killed 16 people and caused tens of millions of dollars of property damage. A short period of even moderate rainfall on a burned watershed can lead to debris flows. Rainfall that is normally absorbed into hillslope soils can run off almost instantly after vegetation has been removed by wildfire. This causes much greater and more rapid runoff than is normal from creeks and drainage areas. Highly erodible soils in a burn scar allow flood waters to entrain large amounts of ash, mud, boulders, and unburned vegetation. Within the burned area and downstream, the force of rushing water, soil, and rock can destroy culverts, bridges, roadways, and buildings, potentially causing injury or death. This emergency debris-flow hazard assessment is presented as relative ranking of the predicted median volume of debris flows that can issue from basin outlets in response to 1.75 inches (44.45 mm) of rainfall over a 3-hour period. Such a storm has a 10-year return period. The calculation of debris flow volume is based on a multiple-regression statistical model that describes the median volume of material that can be expected from a recently burned basin as a function of the area burned at high and moderate severity, the basin area with slopes greater than or equal to 30 percent, and triggering storm rainfall. Cannon and others (2007) describe the methods used to generate the hazard maps. Identification of potential debris-flow hazards from burned drainage basins is necessary to issue warnings for specific basins, to make effective mitigation decisions, and to help plan evacuation timing and routes.

  8. Internal architecture of the proto-Kern Canyon Fault at Engineer's Point, Lake Isabella Dam site, Kern County, California

    NASA Astrophysics Data System (ADS)

    Martindale, Z. S.; Andrews, G. D.; Brown, S. R.; Krugh, W. C.

    2014-12-01

    The core of the Cretaceous (?) proto-Kern Canyon Fault (KCF) is exposed continuously for 1.25 km along Engineer's Point at Lake Isabella, Kern County, California. The proto-KCF is notable for (1) its long and complex history within, and perhaps preceding the Sierra Nevada batholith, and (2) hosting the Quaternary Kern Canyon Fault, an active fault that threatens the integrity of the Lake Isabella auxiliary dam and surrounding communities. We are investigating the internal architecture of the proto-KCF to explore its control on the likely behavior of the modern KCF. The proto-KCF is developed in the Alta Sierra biotite-granodiorite pluton. A traverse across Engineer's Point, perpendicular to the proto-KCF trace, reveals gradational increases in fracture density, fracture length, bulk alteration, and decreases in fracture spacing and grain size toward the fault core. Mapping of the fault core reveals two prominent and laterally extensive zones: (1) continuous foliated blastomylonitic granodiorite with steeply-dipping, anastomosing shear bands and minor mylonite planes, and (2) foliated orange and green fault breccia with intergranular gouge, strong C/S fabric, and a central gouge plane. The fault breccia zone is intruded by a lensoidal, post-deformation dacite dike, probably ca. 105 - 102 Ma (Nadin & Saleeby, 2008) and is weakly overprinted by a set of cross-cutting spaced, short, brittle fractures, often coated in calcite, which we infer to be genetically related to the modern KCF. We present our structural and lithological data that will be supported by mineralogical and geochemical analyses. E. Nadin & J. Saleeby (2008) Disruption of regional primary structure of the Sierra Nevada batholith by the Kern Canyon fault system, California: Geological Society of America Special Paper 438, p. 429-454.

  9. Use of density equalizing map projections (DEMP) in the analysis of childhood cancer in four California counties

    SciTech Connect

    Merrill, D.W. Selvin, S.; Close, E.R.; Holmes, H.H.

    1995-04-01

    In studying geographic disease distributions, one normally compares rates of arbitrarily defined geographic subareas (e.g. census tracts), thereby sacrificing the geographic detail of the original data. The sparser the data, the larger the subareas must be in order to calculate stable rates. This dilemma is avoided with the technique of Density Equalizing Map Projections (DEMP). Boundaries of geographic subregions are adjusted to equalize population density over the entire study area. Case locations plotted on the transformed map should have a uniform distribution if the underlying disease rates are constant. The density equalized map portrays both individual cases and rates, and can be understood by untrained observers. Simple statistical techniques can be used to test the uniformity of the transformed map. This report describes application of the DEMP technique to a sizeable `real-world` data set: 401 childhood cancer cases occurring between 1980 and 1988 in four California counties. In an earlier analysis of the same data, the California Department of Health Services (DHS) calculated rates for 101 communities and found no significant geographic variability. The DDS 1980--88 population estimates are no longer available, so in this analysis 1980 Census data were used; geographic units were 262 census tracts. A k`th nearest neighbor analysis, corrected for boundary effects and for within-tract variability, provides strong evidence for geographic nonuniformity in tract rates ({rho} < l0{sup {minus}4}). No such effect is observed for artificial cases generated under the assumption of constant rates. Pending reanalysis with 1980-88 population estimates, no epidemiologic conclusions can be drawn at this time.

  10. Emergency Assessment of Debris-Flow Hazards from Basins Burned by the 2007 Poomacha Fire, San Diego County, Southern California

    USGS Publications Warehouse

    Cannon, Susan H.; Gartner, Joseph E.; Michael, John A.; Bauer, Mark A.; Stitt, Susan C.; Knifong, Donna L.; McNamara, Bernard J.; Roque, Yvonne M.

    2007-01-01

    INTRODUCTION The objective of this report is to present a preliminary emergency assessment of the potential for debris-flow generation from basins burned by the Poomacha Fire in San Diego County, southern California in 2007. Debris flows are among the most hazardous geologic phenomena; debris flows that followed wildfires in southern California in 2003 killed 16 people and caused tens of millions of dollars of property damage. A short period of even moderate rainfall on a burned watershed can lead to debris flows. Rainfall that is normally absorbed into hillslope soils can run off almost instantly after vegetation has been removed by wildfire. This causes much greater and more rapid runoff than is normal from creeks and drainage areas. Highly erodible soils in a burn scar allow flood waters to entrain large amounts of ash, mud, boulders, and unburned vegetation. Within the burned area and downstream, the force of rushing water, soil, and rock can destroy culverts, bridges, roadways, and buildings, potentially causing injury or death. This emergency debris-flow hazard assessment is presented as relative ranking of the predicted median volume of debris flows that can issue from basin outlets in response to 2.25 inches (57.15 mm) of rainfall over a 3-hour period. Such a storm has a 10-year return period. The calculation of debris flow volume is based on a multiple-regression statistical model that describes the median volume of material that can be expected from a recently burned basin as a function of the area burned at high and moderate severity, the basin area with slopes greater than or equal to 30 percent, and triggering storm rainfall. Cannon and others (2007) describe the methods used to generate the hazard maps. Identification of potential debris-flow hazards from burned drainage basins is necessary to issue warnings for specific basins, to make effective mitigation decisions, and to help plan evacuation timing and routes.

  11. Emergency Assessment of Debris-Flow Hazards from Basins Burned by the 2007 Rice Fire, San Diego County, Southern California

    USGS Publications Warehouse

    Cannon, Susan H.; Gartner, Joseph E.; Michael, John A.; Bauer, Mark A.; Stitt, Susan C.; Knifong, Donna L.; McNamara, Bernard J.; Roque, Yvonne M.

    2007-01-01

    INTRODUCTION The objective of this report is to present a preliminary emergency assessment of the potential for debris-flow generation from basins burned by the Rice Fire in San Diego County, southern California in 2007. Debris flows are among the most hazardous geologic phenomena; debris flows that followed wildfires in southern California in 2003 killed 16 people and caused tens of millions of dollars of property damage. A short period of even moderate rainfall on a burned watershed can lead to debris flows. Rainfall that is normally absorbed into hillslope soils can run off almost instantly after vegetation has been removed by wildfire. This causes much greater and more rapid runoff than is normal from creeks and drainage areas. Highly erodible soils in a burn scar allow flood waters to entrain large amounts of ash, mud, boulders, and unburned vegetation. Within the burned area and downstream, the force of rushing water, soil, and rock can destroy culverts, bridges, roadways, and buildings, potentially causing injury or death. This emergency debris-flow hazard assessment is presented as relative ranking of the predicted median volume of debris flows that can issue from basin outlets in response to 1.75 inches (44.45 mm) of rainfall over a 3-hour period. Such a storm has a 10-year return period. The calculation of debris flow volume is based on a multiple-regression statistical model that describes the median volume of material that can be expected from a recently burned basin as a function of the area burned at high and moderate severity, the basin area with slopes greater than or equal to 30 percent, and triggering storm rainfall. Cannon and others (2007) describe the methods used to generate the hazard maps. Identification of potential debris-flow hazards from burned drainage basins is necessary to issue warnings for specific basins, to make effective mitigation decisions, and to help plan evacuation timing and routes.

  12. Emergency Assessment of Debris-Flow Hazards from Basins Burned by the 2007 Harris Fire, San Diego County, Southern California

    USGS Publications Warehouse

    Cannon, Susan H.; Gartner, Joseph E.; Michael, John A.; Bauer, Mark A.; Stitt, Susan C.; Knifong, Donna L.; McNamara, Bernard J.; Roque, Yvonne M.

    2007-01-01

    INTRODUCTION The objective of this report is to present a preliminary emergency assessment of the potential for debris-flow generation from basins burned by the Harris Fire in San Diego County, southern California in 2007. Debris flows are among the most hazardous geologic phenomena; debris flows that followed wildfires in southern California in 2003 killed 16 people and caused tens of millions of dollars of property damage. A short period of even moderate rainfall on a burned watershed can lead to debris flows. Rainfall that is normally absorbed into hillslope soils can run off almost instantly after vegetation has been removed by wildfire. This causes much greater and more rapid runoff than is normal from creeks and drainage areas. Highly erodible soils in a burn scar allow flood waters to entrain large amounts of ash, mud, boulders, and unburned vegetation. Within the burned area and downstream, the force of rushing water, soil, and rock can destroy culverts, bridges, roadways, and buildings, potentially causing injury or death. This emergency debris-flow hazard assessment is presented as relative ranking of the predicted median volume of debris flows that can issue from basin outlets in response to 1.75 inches (44.45 mm) of rainfall over a 3-hour period. Such a storm has a 10-year return period. The calculation of debris flow volume is based on a multiple-regression statistical model that describes the median volume of material that can be expected from a recently burned basin as a function of the area burned at high and moderate severity, the basin area with slopes greater than or equal to 30 percent, and triggering storm rainfall. Cannon and others (2007) describe the methods used to generate the hazard maps. Identification of potential debris-flow hazards from burned drainage basins is necessary to issue warnings for specific basins, to make effective mitigation decisions, and to help plan evacuation timing and routes.

  13. Emergency Assessment of Debris-Flow Hazards from Basins Burned by the 2007 Santiago Fire, Orange County, Southern California

    USGS Publications Warehouse

    Cannon, Susan H.; Gartner, Joseph E.; Michael, John A.; Bauer, Mark A.; Stitt, Susan C.; Knifong, Donna L.; McNamara, Bernard J.; Roque, Yvonne M.

    2007-01-01

    INTRODUCTION The objective of this report is to present a preliminary emergency assessment of the potential for debris-flow generation from basins burned by the Santiago Fire in Orange County, southern California in 2007. Debris flows are among the most hazardous geologic phenomena; debris flows that followed wildfires in southern California in 2003 killed 16 people and caused tens of millions of dollars of property damage. A short period of even moderate rainfall on a burned watershed can lead to debris flows. Rainfall that is normally absorbed into hillslope soils can run off almost instantly after vegetation has been removed by wildfire. This causes much greater and more rapid runoff than is normal from creeks and drainage areas. Highly erodible soils in a burn scar allow flood waters to entrain large amounts of ash, mud, boulders, and unburned vegetation. Within the burned area and downstream, the force of rushing water, soil, and rock can destroy culverts, bridges, roadways, and buildings, potentially causing injury or death. This emergency debris-flow hazard assessment is presented as relative ranking of the predicted median volume of debris flows that can issue from basin outlets in response to 1.75 inches (44.45 mm) of rainfall over a 3-hour period. Such a storm has a 10-year return period. The calculation of debris flow volume is based on a multiple-regression statistical model that describes the median volume of material that can be expected from a recently burned basin as a function of the area burned at high and moderate severity, the basin area with slopes greater than or equal to 30 percent, and triggering storm rainfall. Cannon and others (2007) describe the methods used to generate the hazard maps. Identification of potential debris-flow hazards from burned drainage basins is necessary to issue warnings for specific basins, to make effective mitigation decisions, and to help plan evacuation timing and routes.

  14. Emergency Assessment of Debris-Flow Hazards from Basins Burned by the 2007 Buckweed Fire, Los Angeles County, Southern California

    USGS Publications Warehouse

    Cannon, Susan H.; Gartner, Joseph E.; Michael, John A.; Bauer, Mark A.; Stitt, Susan C.; Knifong, Donna L.; McNamara, Bernard J.; Roque, Yvonne M.

    2007-01-01

    INTRODUCTION The objective of this report is to present a preliminary emergency assessment of the potential for debris-flow generation from basins burned by the Buckweed Fire in Los Angeles County, southern California in 2007. Debris flows are among the most hazardous geologic phenomena; debris flows that followed wildfires in southern California in 2003 killed 16 people and caused tens of millions of dollars of property damage. A short period of even moderate rainfall on a burned watershed can lead to debris flows. Rainfall that is normally absorbed into hillslope soils can run off almost instantly after vegetation has been removed by wildfire. This causes much greater and more rapid runoff than is normal from creeks and drainage areas. Highly erodible soils in a burn scar allow flood waters to entrain large amounts of ash, mud, boulders, and unburned vegetation. Within the burned area and downstream, the force of rushing water, soil, and rock can destroy culverts, bridges, roadways, and buildings, potentially causing injury or death. This emergency debris-flow hazard assessment is presented as relative ranking of the predicted median volume of debris flows that can issue from basin outlets in response to 2.25 inches (57.15 mm) of rainfall over a 3-hour period. Such a storm has a 10-year return period. The calculation of debris flow volume is based on a multiple-regression statistical model that describes the median volume of material that can be expected from a recently burned basin as a function of the area burned at high and moderate severity, the basin area with slopes greater than or equal to 30 percent, and triggering storm rainfall. Cannon and others (2007) describe the methods used to generate the hazard maps. Identification of potential debris-flow hazards from burned drainage basins is necessary to issue warnings for specific basins, to make effective mitigation decisions, and to help plan evacuation timing and routes.

  15. Emergency Assessment of Debris-Flow Hazards from Basins Burned by the 2007 Canyon Fire, Los Angeles County, Southern California

    USGS Publications Warehouse

    Cannon, Susan H.; Gartner, Joseph E.; Michael, John A.; Bauer, Mark A.; Stitt, Susan C.; Knifong, Donna L.; McNamara, Bernard J.; Roque, Yvonne M.

    2007-01-01

    INTRODUCTION The objective of this report is to present a preliminary emergency assessment of the potential for debris-flow generation from basins burned by the Canyon Fire in Los Angeles County, southern California in 2007. Debris flows are among the most hazardous geologic phenomena; debris flows that followed wildfires in southern California in 2003 killed 16 people and caused tens of millions of dollars of property damage. A short period of even moderate rainfall on a burned watershed can lead to debris flows. Rainfall that is normally absorbed into hillslope soils can run off almost instantly after vegetation has been removed by wildfire. This causes much greater and more rapid runoff than is normal from creeks and drainage areas. Highly erodible soils in a burn scar allow flood waters to entrain large amounts of ash, mud, boulders, and unburned vegetation. Within the burned area and downstream, the force of rushing water, soil, and rock can destroy culverts, bridges, roadways, and buildings, potentially causing injury or death. This emergency debris-flow hazard assessment is presented as relative ranking of the predicted median volume of debris flows that can issue from basin outlets in response to 2.25 inches (57.15 mm) of rainfall over a 3-hour period. Such a storm has a 10-year return period. The calculation of debris flow volume is based on a multiple-regression statistical model that describes the median volume of material that can be expected from a recently burned basin as a function of the area burned at high and moderate severity, the basin area with slopes greater than or equal to 30 percent, and triggering storm rainfall. Cannon and others (2007) describe the methods used to generate the hazard maps. Identification of potential debris-flow hazards from burned drainage basins is necessary to issue warnings for specific basins, to make effective mitigation decisions, and to help plan evacuation timing and routes.

  16. Mineral resources and mineral resource potential of the Saline Valley and Lower Saline Wilderness Study Areas, Inyo County, California

    SciTech Connect

    Wrucke, C.T.; Marsh, S.P.; Raines, G.L.; Werschky, R.S.; Blakely, R.J.; Hoover, D.B.; McHugh, E.L.; Rumsey, C.M.; Gaps, R.S.; Causey, J.D.

    1984-01-01

    This report presents the results of a mineral survey of the Saline Valley Wilderness Study Area and the Lower Saline Wilderness Study Area, California Desert Conservation Area, Inyo County, California. The Saline Valley Wilderness Study Area and the Lower Saline Wilderness Study Area were studied in 1981-83 using geologic, geochemical, remote sensing, and geophysical surveys and the examination of mines and prospects to evaluate mineral resources and the potential for mineral resources. The Saline Valley Wilderness Study Area has a high potential for the occurrence of gold resources in two areas. One area, largely outside the study area, is in the vicinity of the Crater mine in the Last Chance Range, and it has potential for the occurrence of gold in a disseminated deposit in an epithermal environment. The other area is in Marble Canyon in the western part of the study area, and it has high potential for the occurrence of gold placer deposits. Marble Canyon also has a moderate potential for gold in placer deposits downstream from the area of high potential. Seven areas, scattered from the Inyo Mountains to the Last Chance Range, have a low potential for the occurrence of gold in disseminated deposits, and one area that lies astride the border of Death Valley National Monument has a low potential for the occurrence of gold in vein deposits. The southern end of Eureka Valley has a low potential for the occurrence of lithium and uranium resources in buried sedimentary deposits for the occurrence of lithium and uranium resources in buried sedimentary deposits beneath the valley floor. Demonstrated resources of native sulfur exist at the Crater mine but no resource potential was identified nearby in adtacent parts of the study area. 3 figs. (ACR)

  17. Preliminary Image Map of the 2007 Buckweed Fire Perimeter, Green Valley Quadrangle, Los Angeles County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  18. Preliminary Image Map of the 2007 Harris Fire Perimeter, Tecate Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  19. Preliminary Image Map of the 2007 Buckweed Fire Perimeter, Agua Dulce Quadrangle, Los Angeles County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  20. Preliminary Image Map of the 2007 Buckweed Fire Perimeter, Mint Canyon Quadrangle, Los Angeles County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  1. Water-quality assessment of Cache Creek, Yolo, Lake, and Colusa counties, California

    USGS Publications Warehouse

    Sorenson, Stephen K.; Elliott, Ann L.

    1981-01-01

    Cache Creek and its tributaries from Clear Lake to Yolo Bypass have been the subject of quality and quantity of water studies by several governmental agencies since the early 1900's. Water-quality data from these studies showed that water in the basin is of good quality for most of the beneficial uses defined by the California State Water Resources Control Board. Concentrations of dissolved constituents are substantially higher in the water in the two largest tributaries than in Cache Creek. Seasonal variations in dissolved constituents are also greater in the tributaries than in Cache Creek. Clear Lake has a major effect on water quality, resulting in little seasonal fluctuation in water quality in Cache Creek. Excessive voron and suspended-sediment concentrations are the greatest water-quality problems, according to existing data. Both of these problems are from natural sources. Water-quality monitoring is presently being conducted monthly at four sites by the California Department of Water Resurces and at several other sites by other agencies. Modifications in current monitoring are proposed to gain further information on diel dissolved-oxygen cycles, pesticides, and biological constituents that may adversely affect beneficial uses. (USGS)

  2. Preliminary Image Map of the 2007 Ranch Fire Perimeter, Piru Quadrangle, Ventura County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  3. Preliminary Image Map of the 2007 Santiago Fire Perimeter, Tustin Quadrangle, Orange County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  4. Preliminary Image Map of the 2007 Canyon Fire Perimeter, Malibu Beach Quadrangle, Los Angeles County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  5. Preliminary Image Map of the 2007 Witch Fire Perimeter, Santa Ysabel Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  6. Preliminary Image Map of the 2007 Poomacha Fire Perimeter, Palomar Observatory Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  7. Preliminary Image Map of the 2007 Slide Fire Perimeter, Butler Peak Quadrangle, San Bernardino County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  8. Preliminary Image Map of the 2007 Ammo Fire Perimeter, Margarita Peak Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  9. Preliminary Image Map of the 2007 Harris Fire Perimeter, Barrett Lake Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  10. Preliminary Image Map of the 2007 Witch Fire Perimeter, Escondido Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  11. Preliminary Image Map of the 2007 Ranch Fire Perimeter, Fillmore Quadrangle, Ventura County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  12. Preliminary Image Map of the 2007 Poomacha Fire Perimeter, Boucher Hill Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  13. Preliminary Image Map of the 2007 Harris Fire Perimeter, Dulzura Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  14. Preliminary Image Map of the 2007 Cajon Fire Perimeter, Devore Quadrangle, San Bernardino County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  15. Preliminary Image Map of the 2007 Harris Fire Perimeter, Morena Reservoir Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  16. Preliminary Image Map of the 2007 Poomacha Fire Perimeter, Pala Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  17. Preliminary Image Map of the 2007 Witch Fire Perimeter, San Pasqual Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  18. Preliminary Image Map of the 2007 Santiago Fire Perimeter, Lake Forest Quadrangle, Orange County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  19. Preliminary Image Map of the 2007 Harris Fire Perimeter, Potrero Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  20. Preliminary Image Map of the 2007 Slide Fire Perimeter, Harrison Mountain Quadrangle, San Bernardino County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  1. Preliminary Image Map of the 2007 Harris Fire Perimeter, Otay Mountain Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  2. Preliminary Image Map of the 2007 Santiago Fire Perimeter, Orange Quadrangle, Orange County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  3. Preliminary Image Map of the 2007 Witch Fire Perimeter, Warners Ranch Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  4. Preliminary Image Map of the 2007 Harris Fire Perimeter, Otay Mesa Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  5. Preliminary Image Map of the 2007 Harris Fire Perimeter, Jamul Mountains Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  6. Bathymetric and geophysical surveys of Englebright Lake, Yuba-Nevada Counties, California

    USGS Publications Warehouse

    Childs, Jonathan R.; Snyder, Noah P.; Hampton, Margaret A.

    2003-01-01

    Harry L. Englebright Lake is a 9-mile-long (14-kilometer) reservoir located in the Sierra Nevada foothills of northern California on the Yuba River gorge known as The Narrows. The reservoir is impounded by Englebright Dam (Photo 1), a concrete arch structure spanning 348 meters (1,142 feet) across and 79 meters (260 feet) high. The dam was constructed in 1941 for the primary purpose of trapping sediment derived from anticipated hydraulic mining operations in the Yuba River watershed. Hydraulic mining in the Sierra Nevada was halted in 1884 but resumed on a limited basis until the 1930's under the regulation of the California Debris Commission. Although no hydraulic mining in the upper Yuba River watershed resumed after the construction of the dam, the historical mine sites continued to contribute sediment to the river. Today, Englebright Lake is used primarily for recreation and hydropower. In 2001 and 2002, the U.S. Geological Survey (USGS) conducted bathymetric, geophysical, and geological studies of the reservoir under the auspices of the Upper Yuba River Studies Program (UYRSP), a multi-disciplinary investigation into the feasibility of introducing anadromous fish species to the Yuba River system upstream of Englebright Dam. A primary purpose of these studies was to assess the quantity and nature of the sediment that has accumulated behind the dam over the past 60 years. This report presents the results of those surveys, including a new bathymetric map of the reservoir and estimates of the total accumulated sediment volume.

  7. Preliminary Image Map of the 2007 Witch Fire Perimeter, Tule Springs Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  8. Preliminary Image Map of the 2007 Rice Fire Perimeter, Bonsall Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  9. Preliminary Image Map of the 2007 Witch Fire Perimeter, Valley Center Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  10. Preliminary Image Map of the 2007 Slide Fire Perimeter, Keller Peak Quadrangle, San Bernardino County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  11. Preliminary Image Map of the 2007 Buckweed Fire Perimeter, Sleepy Valley Quadrangle, Los Angeles County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  12. Preliminary Image Map of the 2007 Witch Fire Perimeter, Ramona Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  13. Preliminary Image Map of the 2007 Witch Fire Perimeter, Poway Quadrangle, San Diego County, California

    USGS Publications Warehouse

    Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

    2008-01-01

    In the fall of 2007, wildfires burned out of control in southern California. The extent of these fires encompassed large geographic areas that included a variety of landscapes from urban to wilderness. The U.S. Geological Survey National Geospatial Technical Operations Center (NGTOC) is currently (2008) developing a quadrangle-based 1:24,000-scale image map product. One of the concepts behind the image map product is to provide an updated map in electronic format to assist with emergency response. This image map is one of 55 preliminary image map quadrangles covering the areas burned by the southern California wildfires. Each map is a layered, geo-registered Portable Document Format (.pdf) file. For more information about the layered geo-registered .pdf, see the readme file (http://pubs.usgs.gov/of/2008/1029/downloads/CA_Agua_Dulce_of2008-1029_README.txt). To view the areas affected and the quadrangles mapped in this preliminary project, see the map index (http://pubs.usgs.gov/of/2008/1029/downloads/CA_of2008_1029-1083_index.pdf) provided with this report.

  14. Fatality and Injury Severity of Older Adult Motor Vehicle Collisions in Orange County, California, 1998–2007

    PubMed Central

    Lotfipour, Shahram; Sayegh, Rockan; Chakravarthy, Bharath; Hoonpongsimanont, Wirachin; Anderson, Craig L.; Fox, J. Christian; Vaca, Federico E.

    2013-01-01

    Introduction: Injuries and fatalities in adult drivers 18–65 years of age have decreased in recent years due to safer vehicles, enhanced medical policies, and implementation of injury prevention policies. However, adult drivers over 65 years of age are continuing to suffer from motor vehicle collision-related injuries and fatalities at a more constant rate. A number of physiological factors contribute to the deterioration in visual acuity, slower reaction speeds, and decreased awareness in older drivers. The objective of this study was to examine injury severity and fatality rates in older drivers compared to their younger counterparts in Orange County, California. Methods: This study used the Statewide Integrated Traffic Record System data for Orange County for the years 1998–2007. Drivers were categorized into 4 age groups: 25–64, 65–74, 75–84, and older than 85 years of age. Injury severity was assessed by the investigating officer. Results: Of the 197,814 drivers involved in motor vehicle collisions, 178,481 (90.2%) were in the 25–64 age group; 11,397 (5.8%) were 65–74; 6,592 (3.3%) were 75–84; and 1,344 drivers (0.7%) were over 85. Those aged 25–64 had the lowest fatality rate per 100,000 people, 2.5, whereas those 75–84 had the highest fatality rate, 4.9. The percent of crashes involving a left turn increased with age, and the percent that were stopped in the road decreases with age. Change in injury collision involvement ratio in the 3 younger age groups decreased by 26% to 32%, but decreased by 18% among drivers aged 85 years and older. Conclusion: The decrease in collision fatalities was greater in the 25–64-year-old group compared to the older adult population. This disparity highlights the need for further injury prevention efforts for older drivers. PMID:23451291

  15. Faulting apparently related to the 1994 Northridge, California, earthquake and possible co-seismic origin of surface cracks in Potrero Canyon, Los Angeles County, California

    USGS Publications Warehouse

    Catchings, R.D.; Goldman, M.R.; Lee, W.H.K.; Rymer, M.J.; Ponti, D.J.

    1998-01-01

    Apparent southward-dipping, reverse-fault zones are imaged to depths of about 1.5 km beneath Potrero Canyon, Los Angeles County, California. Based on their orientation and projection to the surface, we suggest that the imaged fault zones are extensions of the Oak Ridge fault. Geologic mapping by others and correlations with seismicity studies suggest that the Oak Ridge fault is the causative fault of the 17 January 1994 Northridge earthquake (Northridge fault). Our seismically imaged faults may be among several faults that collectively comprise the Northridge thrust fault system. Unusually strong shaking in Potrero Canyon during the Northridge earthquake may have resulted from focusing of seismic energy or co-seismic movement along existing, related shallow-depth faults. The strong shaking produced ground-surface cracks and sand blows distributed along the length of the canyon. Seismic reflection and refraction images show that shallow-depth faults may underlie some of the observed surface cracks. The relationship between observed surface cracks and imaged faults indicates that some of the surface cracks may have developed from nontectonic alluvial movement, but others may be fault related. Immediately beneath the surface cracks, P-wave velocities are unusually low (<400 m/sec), and there are velocity anomalies consistent with a seismic reflection image of shallow faulting to depths of at least 100 m. On the basis of velocity data, we suggest that unconsolidated soils (<800 m/sec) extend to depths of about 15 to 20 m beneath our datum (<25 m below ground surface). The underlying rocks range in velocity from about 1000 to 5000 m/sec in the upper 100 m. This study illustrates the utility of high-resolution seismic imaging in assessing local and regional seismic hazards.

  16. Humboldt slide - A large shear-dominated retrogressive slope failure

    USGS Publications Warehouse

    Gardner, J.V.; Prior, D.B.; Field, M.E.

    1999-01-01

    Humboldt Slide is a large, complex slide zone located on the northern California continental margin. Its three-dimensional architecture has been imaged by a combination of multibeam bathymetry, Huntec Deep-Tow seismic profiling, and sidescan sonar. The slide is interpreted to be Late Pleistocene to early Holocene in age and was caused by a combination of factors. The area of the slide is a local depocenter with high accumulation rates of organic-rich sediment; there has been local steepening of slopes by tectonic uplifts; and the entire area is one of high seismicity. Overall, the failure occurred by retrogressive, shear-dominated, minimum movement apparently as a sequence of events. Failure initially occurred by subsidence extension at the middle of the feature, followed by upslope retrogressive failure and downslope compression, and finally by translational sliding at the top of the slide. Degassing, as evidenced by abundant pockmarks, may have inhibited downslope translation. The slide may still be active, as suggested by offsets in Holocene hemipelagic sediment draped over some of the shear surfaces. Crown cracks occur above the present head of the failure and may represent the next generation of failure.

  17. Proposed Construction of the Madera County Educational Center in the State Center Community College District. A Report to the Governor and Legislature in Response to a Request from the Board of Governors of the California Community Colleges.

    ERIC Educational Resources Information Center

    California State Postsecondary Education Commission, Sacramento.

    In this report, the California Postsecondary Education Commission responds to a request by the Chancellor of the California Community Colleges to review the need for and location of a new educational center, the Madera County Educational Center, north of Fresno within the State Center Community College District. The report contains nine…

  18. Fire risk in San Diego County, California: A weighted Bayesian model approach

    USGS Publications Warehouse

    Kolden, Crystal A.; Weigel, Timothy J.

    2007-01-01

    Fire risk models are widely utilized to mitigate wildfire hazards, but models are often based on expert opinions of less understood fire-ignition and spread processes. In this study, we used an empirically derived weights-of-evidence model to assess what factors produce fire ignitions east of San Diego, California. We created and validated a dynamic model of fire-ignition risk based on land characteristics and existing fire-ignition history data, and predicted ignition risk for a future urbanization scenario. We then combined our empirical ignition-risk model with a fuzzy fire behavior-risk model developed by wildfire experts to create a hybrid model of overall fire risk. We found that roads influence fire ignitions and that future growth will increase risk in new rural development areas. We conclude that empirically derived risk models and hybrid models offer an alternative method to assess current and future fire risk based on management actions.

  19. Mathematical model of the West Bolsa Ground-water Basin, San Benito County, California

    USGS Publications Warehouse

    Faye, Robert E.

    1976-01-01

    Simulation of the West Bolsa ground-water basin hydrology in California had provided values of basin recharge and discharge and nodally distributed values of transmissivity and storage coefficient. Average net recharge from April 1945 to March 1969 was 6.2 cubic feet per second and occurred as subsurace recharge and infiltration of rain and minor streamflow. Discharge from the basin during the same period was 8.1 cubic feet per second and occurred as pumping and leakage from confined parts of the basin. Values of transmissivity used in the model generally range from 3,300 to 20,000 feet squared per day. Values of storage coefficient used in the model range from 0.0005 to 0.10. (Woodard-USGS)

  20. Ground-water conditions and potential for artificial recharge in Lucerne Valley, San Bernardino County, California

    USGS Publications Warehouse

    Schaefer, Donald H.

    1979-01-01

    The water level in two areas of Lucerne Valley in California has declined more than 100 feet since 1917, including 60 feet from 1954 to 1976. These declines are the result of pumping for the irrigation of alfalfa. The lowering of water levels has caused many shallow domestic wells to go dry. Well yields in the valley generally are between 10 and 1,000 gallons per minute. About 240 ,000 acre-feet of ground water was withdrawn between 1950 and 1976. About 1,750,000 acre-feet remains in storage. Water of poor quality underlies the valley around Lucerne Lake. There was no definable movement of this water from 1954 to 1976, but the possibility exists for future movement toward centers of pumping. Lucerne Valley may be hydrologically suitable for artificial-recharge operations. (Woodard-USGS)

  1. Tick-borne Relapsing Fever and Borrelia hermsii, Los Angeles County, California, USA

    PubMed Central

    Raffel, Sandra J.; Schrumpf, Merry E.; Webster, Larry S.; Marques, Adriana R.; Spano, Robyn; Rood, Michael; Burns, Joe; Hu, Renjie

    2009-01-01

    The primary cause of tick-borne relapsing fever in western North America is Borrelia hermsii, a rodent-associated spirochete transmitted by the fast-feeding soft tick Ornithodoros hermsi. We describe a patient who had an illness consistent with relapsing fever after exposure in the mountains near Los Angeles, California, USA. The patient’s convalescent-phase serum was seropositive for B. hermsii but negative for several other vector-borne bacterial pathogens. Investigations at the exposure site showed the presence of O. hermsi ticks infected with B. hermsii and the presence of rodents that were seropositive for the spirochete. We determined that this tick-borne disease is endemic to the San Gabriel Mountains near the greater Los Angeles metropolitan area. PMID:19624916

  2. Map Showing Seacliff Response to Climatic and Seismic Events, Depot Hill, Santa Cruz County, California

    USGS Publications Warehouse

    Hapke, Cheryl J.; Richmond, Bruce M.; D'Iorio, Mimi M.

    2002-01-01

    INTRODUCTION The coastal cliffs along much of the central California coast are actively retreating. Large storms and periodic earthquakes are responsible for most of the documented seacliff slope failures. Long-term average erosion rates calculated for this section of coast (Moore and others, 1999) do not provide the spatial or temporal data resolution necessary to identify the processes responsible for retreat of the seacliffs, where episodic retreat threatens homes and community infrastructure. Research suggests that more erosion occurs along the California coast over a short time scale, during periods of severe storms or seismic activity, than occurs during decades of normal weather or seismic quiescence (Griggs and Scholar, 1998; Griggs, 1994; Plant and Griggs, 1990; Griggs and Johnson, 1979 and 1983; Kuhn and Shepard, 1979). This is the first map in a series of maps documenting the processes of short-term seacliff retreat through the identification of slope failure styles, spatial variability of failures, and temporal variation in retreat amounts in an area that has been identified as an erosion hotspot (Moore and others, 1999; Griggs and Savoy, 1985). This map presents seacliff failure and retreat data from Depot Hill, California, which is located five kilometers east of Santa Cruz (fig.1) near the town of Capitola, along the northern Monterey Bay coast. The data presented in this map series provide high-resolution spatial and temporal information on the location, amount, and processes of seacliff retreat in Santa Cruz, California. These data show the response of the seacliffs to both large magnitude earthquakes and severe climatic events such as El NiOos; this information may prove useful in predicting the future response of the cliffs to events of similar magnitude. The map data can also be incorporated into Global Information System (GIS) for use by researchers and community planners. Four sets of vertical aerial photographs (Oct. 18, 1989; Jan. 27, 1998

  3. Map Showing Seacliff Response to Climatic and Seismic Events, Seacliff State Beach, Santa Cruz County, California

    USGS Publications Warehouse

    Hapke, Cheryl J.; Richmond, Bruce M.; D'Iorio, Mimi M.

    2002-01-01

    INTRODUCTION The coastal cliffs along much of the central California coast are actively retreating. Large storms and periodic earthquakes are responsible for most of the documented seacliff slope failures. Long-term average erosion rates calculated for this section of coast (Moore and others, 1999) do not provide the spatial or temporal data resolution necessary to identify the processes responsible for retreat of the seacliffs, where episodic retreat threatens homes and community infrastructure. Research suggests that more erosion occurs along the California coast over a short time scale, during periods of severe storms or seismic activity, than occurs during decades of normal weather or seismic quiescence (Griggs and Scholar, 1998; Griggs, 1994; Plant and Griggs, 1990; Griggs and Johnson, 1979 and 1983; Kuhn and Shepard, 1979). This is the second map in a series of maps documenting the processes of short-term seacliff retreat through the identification of slope failure styles, spatial variability of failures, and temporal variation in retreat amounts in an area that has been identified as an erosion hotspot (Moore and others, 1999; Griggs and Savoy, 1985). This map presents seacliff failure and retreat data from Seacliff State Beach, California, which is located seven kilometers east of Santa Cruz (fig. 1) along the northern Monterey Bay coast. The data presented in this map series provide high-resolution spatial and temporal information on the location, amount, and processes of seacliff retreat in Santa Cruz, California. These data show the response of the seacliffs to both large magnitude earthquakes and severe climatic events such as El Ni?os; this information may prove useful in predicting the future response of the cliffs to events of similar magnitude. The map data can also be incorporated into Global Information System (GIS) for use by researchers and community planners. Four sets of vertical aerial photographs (Oct. 18, 1989; Jan. 27, 1998; Feb. 9, 1998

  4. 78 FR 22031 - California High-Speed Rail Authority-Construction Exemption-In Merced, Madera and Fresno Counties...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-04-12

    ... Surface Transportation Board California High-Speed Rail Authority--Construction Exemption--In Merced... Administration (FRA) and California High-Speed Rail Authority (Authority). This Final EIS is titled ``California... of the planned California HST system, which would provide intercity, high-speed passenger...

  5. Water resources and geology of the Los Coyotes Indian Reservation and vicinity, San Diego County, California

    USGS Publications Warehouse

    Ballog, A.P., Jr.; Moyle, W.R., Jr.

    1980-01-01

    The water resources of the Los Coyotes Indian Reservation, San Diego County, Calif., are sufficient to supply the limited domestic and stock-water needs of the present residents of the reservation. Surface-water runoff is derived from direct precipitation on the area and from intermittent spring flow. Groundwater occurs in the alluvial deposits and in the consolidated rocks where they are highly fractured or deeply weathered. The best potential for groundwater development on the reservation is in the small alluvial basins in the San Ysidro and San Ignacio areas. Most water on the reservation is good to excellent in chemical quality for domestic, stock, and irrigation use. Water from two wells (and one spring), however, exceeds the primary drinking-water standard for nitrate plus nitrate. (USGS)

  6. Birth of a fault: Connecting the Kern County and Walker Pass, California, earthquakes

    USGS Publications Warehouse

    Bawden, G.W.; Michael, A.J.; Kellogg, L.H.

    1999-01-01

    A band of seismicity transects the southern Sierra Nevada range between the northeastern end of the site of the 1952 MW (moment magnitude) 7.3 Kern County earthquake and the site of the 1946 MW 6.1 Walker Pass earthquake. Relocated earthquakes in this band, which lacks a surface expression, better delineate the northeast-trending seismic lineament and resolve complex structure near the Walker Pass mainshock. Left-lateral earthquake focal planes are rotated counterclockwise from the strike of the seismic lineament, consistent with slip on shear fractures such as those observed in the early stages of fault development in laboratory experiments. We interpret this seismic lineament as a previously unrecognized, incipient, currently blind, strike-slip fault, a unique example of a newly forming structure.

  7. Case-control study of intracranial meningiomas in women in Los Angeles County, California

    SciTech Connect

    Preston-Martin, S.; Paganini-Hill, A.; Henderson, B.E.; Pike, M.C.; Wood, C.

    1980-07-01

    A case-control study was conducted among women in Los Angeles County to investigate possible causes of intracranial meningiomas. Questionnaires sought information from patients and from a neighbor of each one on characteristics and past experiences that might be associated with the development of this disease. Information was obtained on 188 matched patient-neighbor pairs. Three primary factors appeared to be associated with meningioma occurrence: 1) a history of head trauma (odds ratio = 2.0, p = 0.01), 2) consumption of certain cured meats (odds ratio = 2.8, p = less than 0.01), and 3) exposure to medical and dental diagnostic X-rays to the head. For diagnostic X-rays, the strongest association was with early exposure (less than 20 yr old) to full-mouth dental X-ray series (odds ratio = 4.0, p less than 0.01).

  8. Geohydrology and artificial-recharge potential of the Irvine area, Orange County, California

    USGS Publications Warehouse

    Singer, John A.

    1973-01-01

    The Irvine area is in hydraulic continuity with the rest of the coastal plain in Orange County. Factors that distinguish the aquifer section of the Irvine area from that in other parts of the coastal plain are a low permeability, a high clay and silt content, and a thin alluvial sequence. Rapid facies change and the large percentage of silt and clay in the section locally result in confining conditions. The aquifer, most of which is included in the Fernando Formation, is as much as 1,300 feet thick beneath parts of the plain. The alluvium overlying the Fernando Formation averages about 200-250 feet in thickness and also contains significant amounts of silt and clay. Transmissivities range from 25,000 to 100,000 gallons per day per foot in the Irvine area, values which are much lower than those in the rest of the coastal plain in Orange County. Water levels have recovered as much as 60 feet from the low levels of the early 1950's. Water-level maps indicate that in the winter non-pumping season water tends to move toward upper Newport Bay and the rest of the coastal plain. During the summer pumping season a cone of depression develops, reversing the winter gradient. The average dissolved-solids content of the ground water is about 800 milligrams per liter. The most prevalent cations are sodium and calcium; the most prevalent anions are bicarbonate and sulfate. No long-term degradation of water quality has occurred, with the exception of a slight increase in dissolved solids. No areas in the Irvine area are suitable for the large-scale spreading of water for artificial recharge. Clay and silt predominate in the section beneath the Tustin plain, and in the foothill areas either bedrock is close to the surface or the alluvium is fine grained.

  9. Correlates of tanning facility prevalence within San Diego County, California census tracts.

    PubMed

    Patel, Minal R; Mayer, Joni A; Slymen, Donald J; Weeks, John R; Hurd, Ami L

    2007-12-01

    Adolescents frequenting indoor tanning facilities may have an increased risk of skin cancer. The high level of indoor tanning by this age group may be due, in part, to the large number of tanning facilities in US cities. This study examined how facilities are distributed throughout one large county. Based on ecological models, it was predicted that tanning facilities are more likely to be located within certain neighborhoods based on the neighborhood's distributions of demographic factors, including income, educational attainment, race/ethnicity, age, and sex. We also explored whether selected aspects of the built environment, including the numbers of high schools and fitness centers, would predict the number of tanning facilities. The number of tanning facilities within 605 census tracts of San Diego County was examined through geographic information systems mapping. Results from multivariate Poisson log-linear regression indicated that higher numbers or proportions of the following variables within a census tract were significantly, positively correlated with the number of tanning facilities: fitness centers, teenagers 15-19 years, females 15-24 years, females 25-29 years, and non-Hispanic Whites. Results from additional analyses using a 1000-foot buffer zone around each census tract boundary showed that higher relative distributions of the following variables were significantly, positively correlated with the number of tanning facilities: high schools, fitness centers, females 15-24 years, females 25-29 years, and non-Hispanic Whites. These findings suggest a relationship exists between the numbers of tanning facilities and certain built-environmental and demographic characteristics within census tracts. Determining this relationship is important for developing future interventions. PMID:17940870

  10. Property description and fact-finding report for NPR-2, Buena Vista Hills Field, Kern County, California

    SciTech Connect

    1996-06-01

    The US Department of Energy has asked Gustavson Associates, Inc. to serve as an Independent Petroleum Consultant under contract DE-AC01-96FE64202. This authorizes a study and recommendations regarding future development of Naval Petroleum Reserve No. 2 (NPR-2) in Kern County, California. The report that follows is the Phase 1 fact-finding and property description for that study. The United States of America owns 100 percent of the mineral rights and 96.1 percent of surface rights in 10,447 acres of the 30,182 acres contained within NPR-2. This property comprises the Buena Vista Hills Oil Field. Oil and gas companies have leased out 9,227 acres in 17 separate leases. Discovered in 1909, this field has approximately 435 active wells producing 2,819 gross barrels of oil and 8.6 million cubic feet of gas per day. Net production to the Government royalty interests include 200 barrels of oil per day and 750 thousand cubic feet of gas per day. Royalty revenues are about $1.7 million per year. Remaining recoverable reserves are approximately 407 thousand barrels of oil and 1.8 billion cubic feet of gas. Significant plugging and abandonment (P&A) and environmental liabilities are present, but these should be the responsibility of the lessees. Ultimate liability still rests with the United States and may increase as the leases are sold to smaller and smaller operators.

  11. Fluoride, nitrate and water hardness in groundwater supplied to the rural communities of Ensenada County, Baja California, Mexico

    NASA Astrophysics Data System (ADS)

    Daesslé, L. W.; Ruiz-Montoya, L.; Tobschall, H. J.; Chandrajith, R.; Camacho-Ibar, V. F.; Mendoza-Espinosa, L. G.; Quintanilla-Montoya, A. L.; Lugo-Ibarra, K. C.

    2009-07-01

    The hydrogeochemistry of 26 wells belonging to ten different aquifers in the county of Ensenada, Baja California, is studied. These wells are all used to supply the rural communities in the region, which comprise ~37,000 inhabitants, excluding the city of Ensenada. High total dissolved solids (TDS) concentrations (maximum 7.35 g l-1) indicate that salt is a ubiquitous contaminant in the aquifers due to seawater intrusion. The aquifers that support extensive agriculture activities (Maneadero, San Quintín, San Simón and El Rosario) are characterized by higher N-NO3 concentrations (maximum 20 mg l-1) derived from fertilizers. Fluoride concentrations exceed the 1.5 mg l-1 Mexican official limit in only four wells. The enrichments of F- in the southern aquifers are thought to be associated to water-rock interactions controlled mainly by Na-Ca equilibrium reactions with fluorite, as suggested from high dissolved Na concentrations in these waters. In the northern aquifer of Maneadero, no enrichment of Na is found and a geothermal source for F- is likely. Water is hard to moderately hard, with Ca/Mg ratios >1. Although drinking water directly from the tap is not a common practice in these localities, most sources have concentrations of major ions and TDS that exceed the Mexican official limits.

  12. The effect of selenium on reproduction of black-tailed deer (Odocoileus hemionus columbianus) in Shasta County California

    SciTech Connect

    Flueck, W.T.

    1989-01-01

    This study was to determine if nutritional inadequacy of selenium may be responsible for a declining reproductive rate of a migratory herd of black-tailed deer. Selenium is an essential trace mineral for mammalian herbivores. Deficiency affects primarily neonates resulting in increased mortality rates. Shasta County, California is indigenously low in selenium due to soil characteristics. Local livestock enterprises have experienced reproductive problems, which were responsive to selenium treatment. The low recruitment rate in the deer herd suggested a physiological link between low selenium status and reproductive problems, and an experimental trial was initiated. Free ranging adult females were supplemented with selenium rumen pellets and marked with radio transmitters. From 1985 to 1987, the selenium dose was doubled as compared to 1984. It was established that evaluation of selenium status by determining whole blood selenium levels adequately describes the major bioactive form of selenium, glutathione peroxidase. To evaluate the experimental trial, the pre-weaning survival rate of progeny of supplemented females was compared with the rate in the untreated herd.

  13. Review of samples of sediment, tailings, and waters adjacent to the Cactus Queen gold mine, Kern County, California

    USGS Publications Warehouse

    Rytuba, James J.; Kim, Christopher S.; Goldstein, Daniel N.

    2011-01-01

    The Cactus Queen Mine is located in the western Mojave Desert in Kern County, California. The Cactus Queen gold-silver (Au-Ag) deposit is similar to other Au-Ag deposits hosted in Miocene volcanic rocks that consist of silicic domes and associated flows, pyroclastic rocks, and subvolcanic intrusions. The volcanic rocks were emplaced onto a basement of Mesozoic silicic intrusive rocks. A part of the Cactus Queen Mine is located on Federal land managed by the U.S. Bureau of Land Management (BLM). Staff from the BLM initially sampled the mine area and documented elevated concentrations of arsenic (As) in tailings and sediment. BLM then requested that the U.S. Geological Survey (USGS), in collaboration with Chapman University, measure and characterize As and other geochemical constituents in sediment, tailings, and waters on the part of the mine on Federal lands. This report is made in response to the request by the BLM, the lead agency mandated to conduct a Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) - Removal Site Investigation (RSI). The RSI applies to the potential removal of As-contaminated mine waste from the Cactus Queen Mine as a means of reducing As release and exposure to humans and biota. This report summarizes data obtained from field sampling of sediments, mine tailings, and surface waters at the Cactus Queen Mine on January 27, 2008. Our results provide a preliminary assessment of the sources of As and associated chemical constituents that could potentially impact humans and biota.

  14. late Pleistocene and Holocene pollen record from Laguna de las Trancas, northern coastal Santa Cruz County, California

    USGS Publications Warehouse

    Adam, David P.; Byrne, Roger; Luther, Edgar

    1981-01-01

    A 2.1-m core from Laguna de las Trancas, a marsh atop a landslide in northern Santa Cruz County, California, has yielded a pollen record for the period between about 30,000 B. P. and roughly 5000 B. P. Three pollen zones are recognized. The earliest is characterized by high frequencies of pine pollen and is correlated with a mid-Wisconsinan interstade of the mid-continent. The middle zone contains high frequencies of both pine and fir (Abies, probably A. grandis) pollen and is correlated with the last full glacial interval (upper Wisconsinan). The upper zone is dominated by redwood (Sequoia) pollen and represents latest Pleistocene to middle Holocene. The past few thousand years are not represented in the core. The pollen evidence indicates that during the full glacial period the mean annual temperature at the site was about 2°C to 3°C lower than it is today. We attribute this small difference to the stabilizing effect of marine upwelling on the temperature regime in the immediate vicinity of the coast. Precipitation may have been about 20 percent higher as a result of longer winter wet seasons.

  15. Sediment accumulation in San Leandro Bay, Alameda County, California, during the 20th century - A preliminary report

    SciTech Connect

    Nolan, K.M.; Fuller, C.C.

    1986-01-01

    Major changes made in the configuration of San Leandro Bay, Alameda County, California, during the 20th century have caused rapid sedimentation within parts of the Bay. Comparison of bathymetric surveys indicates that sedimentation in the vicinity of the San Leandro Bay channel averaged 0.7 cm/annum between 1856 and 1984. Lead-210 data collected at four shallow water sites east of the San Leandro Bay channel indicated that sedimentation rates have averaged between 0.06 and 0.28 cm/annum. Because bioturbation of bottom sediments cannot be discounted, better definition of this range in sedimentation rates would require measuring the activity of lead-210 on incoming sediments. In addition to sediment deposited in the vicinity of the San Leandro Bay channel and open, shallow areas to the east, 850,740 cu m of sediment was deposited between 1948 and 1983 in an area dredged at the mouth of San Leandro Creek. All available data indicate that between 1,213,000 and 1,364,000 cu m of sediment was deposited in San Leandro Bay between 1948 and 1983. Sediment yield data from an adjacent drainage basin, when combined with inventories of lead-210 and cesium-137, indicate that most of the sediment deposited in San Leandro Bay is coming from resuspension of bottom sediments or from erosion of marshes or shorelines of San Leandro or San Francisco Bay. 31 refs., 7 figs., 4 tabs.

  16. Application of advanced geophysical logging methods in the characterization of a fractured-sedimentary bedrock aquifer, Ventura County, California

    USGS Publications Warehouse

    Williams, John H.; Lane, Jr., John W.; Singha, Kamini; Haeni, F. Peter

    2002-01-01

    An integrated suite of advanced geophysical logging methods was used to characterize the geology and hydrology of three boreholes completed in fractured-sedimentary bedrock in Ventura County, California. The geophysical methods included caliper, gamma, electromagnetic induction, borehole deviation, optical and acoustic televiewer, borehole radar, fluid resistivity, temperature, and electromagnetic flowmeter. The geophysical logging 1) provided insights useful for the overall geohydrologic characterization of the bedrock and 2) enhanced the value of information collected by other methods from the boreholes including core-sample analysis, multiple-level monitoring, and packer testing. The logged boreholes, which have open intervals of 100 to 200 feet, penetrate a sequence of interbedded sandstone and mudstone with bedding striking 220 to 250 degrees and dipping 15 to 40 degrees to the northwest. Fractures intersected by the boreholes include fractures parallel to bedding and fractures with variable strike that dip moderately to steeply. Two to three flow zones were detected in each borehole. The flow zones consist of bedding-parallel or steeply dipping fractures or a combination of bedding-parallel fractures and moderately to steeply dipping fractures. About 75 to more than 90 percent of the measured flow under pumped conditions was produced by only one of the flow zones in each borehole.

  17. Concentrations of mercury and other metals in black bass (Micropterus spp.) from Whiskeytown Lake, Shasta County, California, 2005

    USGS Publications Warehouse

    May, Jason T.; Hothem, Roger L.; Bauer, Marissa L.; Brown, Larry R.

    2012-01-01

    This report presents the results of a reconnaissance study conducted by the U.S. Geological Survey (USGS) to determine mercury (Hg) and other selected metal concentrations in Black bass (Micropterus spp.) from Whiskeytown Lake, Shasta County, California. Total mercury concentrations were determined by cold-vapor atomic absorption spectroscopy (CVAAS) in fillets and whole bodies of each sampled fish. Selected metals scans were performed on whole bodies (less the fillets) by inductively coupled plasma–mass spectroscopy (ICP-MS) and inductively coupled plasma–optical emission spectroscopy (ICP-OES). Mercury concentrations in fillet samples ranged from 0.06 to 0.52 micrograms per gram (μg/g) wet weight (ww). Total mercury (HgT) in the same fish whole-body samples ranged from 0.04 to 0.37 (μg/g, ww). Mercury concentrations in 17 percent of "legal catch size" (≥305 millimeters in length) were above the U.S. Environmental Protection Agency water-quality criterion for the protection of human health of 0.30 μg/g (ww). These data will serve as a baseline for future monitoring efforts within Whiskeytown Lake.

  18. Contaminants in sediment, food-chain biota, and bird eggs from the Newport Bay watershed, Orange County, California.

    PubMed

    Santolo, Gary M; Byron, Earl R; Ohlendorf, Harry M

    2016-02-01

    Groundwater-related discharges in the San Diego Creek/Newport Bay watershed in Orange County, California have the potential to adversely affect the surface waters within the watershed and would likely not comply with the established total maximum daily loads (TMDLs) for the watershed. In 2004 and 2005, we studied the concentrations of contaminants of TMDL concern (particularly selenium [Se]) in birds that are at risk of exposure to contaminated food items because they feed and nest in the Newport Bay watershed. Most bioaccumulation is from elevated Se in groundwater downstream of a historic terminal swamp. Se bioaccumulation was observed in all biota tested, and DDE was found in fish and bird egg samples. Effects of contaminants on fish and birds are inconclusive due to the management disturbances in the watershed (e.g., flood control) and lack of bird nesting habitat. Although a significant relationship was observed between DDE concentrations and eggshell thinning in American avocet (Recurvirostra americana) eggs, the shell thinning in avocet and other species examined was not enough to result in hatching failure. Further focused monitoring efforts will be needed to characterize the exposure and risk levels. PMID:26803663

  19. Sediment discharge in the Upper Arroyo Grande and Santa Rita Creek basins, San Luis Obispo County, California

    USGS Publications Warehouse

    Knott, J.M.

    1976-01-01

    Sediment data collected in the upper Arroyo Grande and Santa Rita Creek basins, San Luis Obispo County, California, during the 1968-73 water years were analyzed to determine total sediment discharge at four stations in the basins. Water discharge and total sediment discharge at these stations, representative of the 1943-72 period, were estimated from long-term flow data for nearby gaging stations and water-sediment discharge relations determined for the 1968-73 water years. Most of the total annual sediment discharge at each station occurs during a few days each year. The quantity of sediment transported in a single day often accounts for more than 40 percent of the total annual sediment discharge. Estimated sediment discharge for the upper Arroyo Grande and Santa Rita Creek basins during the 1943-72 water years averaged 53,000 tons and 23,000 tons per year. Long-term sediment deposition in Lopez Reservoir, which is in the southern part of the upper Arroyo Grande basin, was estimated to be 35 acre-feet per year. (Woodard-USGS)

  20. Case study of the Wendel-Amedee Exploration Drilling Project, Lassen County, California, User Coupled Confirmation Drilling Program

    SciTech Connect

    Zeisloft, J.; Sibbett, B.S.; Adams, M.C.

    1984-09-01

    The Wendel-Amedee KGRA is located in Honey Lake basin in Lassen County, California, on the boundary between the Modoc Plateau and the Basin and Range geologic provinces. A variety of geophysical surveys was performed over the project property. Geophysical data helped in establishing the regional structural framework, however, none of the geophysical data is sufficiently refined to be considered suitable for the purpose of siting an exploration drill hole. Drilling of reservoir confirmation well WEN-1 took place from August 1 to September 22, 1981. Pulse and long-term flow testing subjected the reservoir to a maximum flow of 680 gpm for 75 hours. At that rate, the well exhibited a productivity index of 21.6 gpm/psi; the reservoir transmissivity was 3.5 x 10/sup 6/ md-ft/cp. The maximum bottom-hole temperature recorded during testing was 251/sup 0/F. The conceptual model of the geothermal resource at Wendel Hot Springs calls on ground water, originating in the neighboring volcanic highlands, descending through jointed and otherwise permeable rocks into the granitic basement. Once in the basement, the fluid is heated as it continues its descent, and lateral movement as dictated by the hydrologic gradient. It then rises to the discharge point along transmissive faults. 45 refs., 28 figs., 3 tabs.

  1. Upper Clear Creek watershed aquatic chemistry and biota surveys, 2004-5, Whiskeytown National Recreation Area, Shasta County, California

    USGS Publications Warehouse

    Wulff, Marissa L.; May, Jason T.; Brown, Larry R.

    2012-01-01

    The U.S. Geological Survey, in cooperation with the National Park Service and Whiskeytown National Recreation Area, performed a comprehensive aquatic biota survey of the upper Clear Creek watershed, Shasta County, California, during 2004-5. Data collected in this study can provide resource managers with information regarding aquatic resources, watershed degradation, and regional biodiversity within Whiskeytown National Recreation Area. Surveys of water chemistry, bed-sediment chemistry, algae assemblages, benthic macroinvertebrate assemblages, aquatic vertebrate assemblages, in-stream habitat characteristics, and sediment heterogeneity were conducted at 17 stream sites during both 2004 and 2005, with an additional 4 sites surveyed in 2005. A total of 67 bed-sediment samples were analyzed for major and trace inorganic element concentrations. Forty-six water samples were analyzed for trace metals and nutrients. A total of 224 taxa of invertebrates were collected during these surveys. Eleven fish species, seven of which were native, and two species of larval amphibians, were collected. A total of 24 genera of soft algae and 159 taxa of diatoms were identified. To date, this survey represents the most comprehensive inventory of aquatic resources within Whiskeytown National Recreation Area, and this information can serve as a baseline for future monitoring efforts and to inform management decisions.

  2. Hydraulic Fracturing of 403 Shallow Diatomite Wells in South Belridge Oil Field, Kern County, California, in 2014

    NASA Astrophysics Data System (ADS)

    Wynne, D. B.; Agusiegbe, V.

    2015-12-01

    We examine all 403 Hydraulic Fracture (HF) jobs performed by Aera Energy, LLC, in the South Belridge oil field, Kern County, CA in 2014. HFs in the South Belridge oil field are atypical amongst North American plays because the reservoir is shallow and produced via vertical wells. Our data set constitutes 88% of all HF jobs performed in CA oil fields in calendar-2014. The South Belridge field produces 11% of California's oil and the shallow HFs performed here differ from most HFs performed elsewhere. We discuss fracture modeling and methods and summary statistics, and modelled dimensions of fractures and their relationships to depth and reservoir properties. The 403 HFs were made in the diatomite-dominated Reef Ridge member of the Monterey Formation. The HFs began at an average depth of 1047 feet below ground (ft TVD) and extended an average of 626 ft vertically downward. The deepest initiation of HF was at 2380 ft and the shallowest cessation was at 639 ft TVD. The average HF was performed using 1488 BBL (62,496 gallons) of water. The HFs were performed in no more than 6 stages and nearly all were completed within one day. We (1) compare metrics of the South Belridge sample group with recent, larger "all-CA" and nationwide samples; and (2) conclude that if relationships of reservoir properties, well completion and HF are well understood, shallow diatomite HF may be optimized to enhance production while minimizing environmental impact.

  3. Use of Density Equalizing Map Projections (DEMP) in the analysis of childhood cancer in four California counties. Revision 2

    SciTech Connect

    Merrill, D.W.; Close, E.R.; Holmes, H.H.; Selvin, S. |

    1995-10-01

    In studying geographic disease distributions, one normally compares rates among arbitrarily defined geographic subareas (e.g. census tracts), thereby sacrificing the geographic detail of the original data. The sparser the data, the larger the subareas must be in order to calculate stable rates. This dilemma is avoided with the technique of Density Equalizing Map Projections (DEMP). Boundaries of geographic subregions are adjusted to equalize population density over the entire study area. Case locations plotted on the transformed map should have a uniform distribution if the underlying disease rates are constant. The present report describes the application of the DEMP technique to 401 childhood cancer cases occurring between 1980 and 1988 in four California counties, with the use of map files and population data for the 262 tracts of the 1980 Census. A k`th nearest neighbor analysis provides strong evidence for geographic non-uniformity in tract rates (p < 10{sup {minus}4}). No such effect is observed for artificial cases generated under the assumption of constant rates. Work is in progress to repeat the analysis with improved population estimates derived from both 1980 and 1990 Census data. Final epidemiologic conclusions will be reported when that analysis is complete.

  4. Superfund Record of Decision (EPA Region 9): Atlas Asbestos Mine, Fresno County, California (First remedial action), July 1989

    SciTech Connect

    Not Available

    1989-07-19

    The Atlas Asbestos Mine site is in Fresno County, California, and is being remediated concurrently with the Coalinga Asbestos Mine site. The Record of Decision (ROD) does not address the mines, but rather a separate area in the city of Coalinga, where asbestos, from the Atlas-Coalinga mines, was deposited to await handling and shipment. The site consists of four distinct areas: the warehouse which was once a mining waste distribution center and which currently houses 1,600 cubic yards of mining waste; a storage yard which contains asbestos-contaminated stacked pipes; a shipping yard which was used as an asbestos distribution center by the Atlas Asbestos Company; and the U.S. Asbestos Company which currently stores piles of asbestos-contaminated mining waste. Subsequent sampling programs, conducted between 1983 and 1987, revealed that surface water and air also contained elevated levels of asbestos. As a result of these finding, EPA issued an Administrative Order to a major landowner, Southern Pacific Transportation Company (SPTC), requiring SPTC to conduct an additional remedial investigation and a feasibility study and to perform interim measures to stabilize the site. The primary contaminants of concern affecting the soil and debris are metals including nickel, and other inorganics including asbestos and mining wastes. The selected remedial action for this site are included.

  5. Emergency assessment of post-fire debris-flow hazards for the 2013 Springs Fire, Ventura County, California

    USGS Publications Warehouse

    Staley, Dennis M.

    2014-01-01

    Wildfire can significantly alter the hydrologic response of a watershed to the extent that even modest rainstorms can produce dangerous flash floods and debris flows. In this report, empirical models are used to predict the probability and magnitude of debris-flow occurrence in response to a 10-year rainstorm for the 2013 Springs fire in Ventura County, California. Overall, the models predict a relatively high probability (60–80 percent) of debris flow for 9 of the 99 drainage basins in the burn area in response to a 10-year recurrence interval design storm. Predictions of debris-flow volume suggest that debris flows may entrain a significant volume of material, with 28 of the 99 basins identified as having potential debris-flow volumes greater than 10,000 cubic meters. These results of the relative combined hazard analysis suggest there is a moderate likelihood of significant debris-flow hazard within and downstream of the burn area for nearby populations, infrastructure, wildlife, and water resources. Given these findings, we recommend that residents, emergency managers, and public works departments pay close attention to weather forecasts and National Weather Service-issued Debris Flow and Flash Flood Outlooks, Watches, and Warnings, and that residents adhere to any evacuation orders.

  6. Surficial geology and stratigraphy of Pleistocene Lake Manix, San Bernardino County, California

    USGS Publications Warehouse

    Reheis, Marith C.; Redwine, Joanna R.; Wan, Elmira; McGeehin, John P.; VanSistine, D. Paco

    2014-01-01

    Pluvial Lake Manix and its surrounding drainage basin, in the central Mojave Desert of California, has been a focus of paleoclimate, surficial processes, and neotectonic studies by the U.S. Geological Survey (USGS) since about 2004. The USGS initiated studies of Lake Manix deposits to improve understanding of the paleoclimatic record and the shifts in atmospheric circulation that controlled precipitation in the Mojave Desert. Until approximately 25,000 years ago, Lake Manix was the terminus of the Mojave River, which drains northeasterly from the San Bernardino Mountains; the river currently terminates in the Soda Lake and Silver Lake playas. Pleistocene Lake Manix occupied several subbasins at its maximum extent. This map focuses on the extensive exposures created by incision of the Mojave River and its tributaries into the interbedded lacustrine and alluvial deposits within the central (Cady) and northeastern (Afton) subbasins of Lake Manix, and extends from the head of Afton Canyon to Manix Wash. The map illuminates the geomorphic development and depositional history of the lake and alluvial fans within the active tectonic setting of the eastern California shear zone, especially interactions with the left-lateral Manix fault. Lake Manix left an extraordinarily detailed but complex record of numerous transgressive-regressive sequences separated by desiccation and deposition of fan, eolian, and fluvial deposits, and punctuated by tectonic movements and a catastrophic flood that reconfigured the lake basin. Through careful observation of the intercalated lacustrine and fan sequences and by determining the precise elevations of unit contacts, this record was decoded to understand the response of the lake and river system to the interplay of climatic, geomorphic, and tectonic forces. These deposits are exposed in steep badland topography. Mapping was carried out mostly at scales of 1:12,000, although the map is presented at 1:24,000 scale, and employs custom unit

  7. Geohydrology of part of the Round Valley Indian Reservation, Mendocino County, California

    USGS Publications Warehouse

    Muir, K.S.; Webster, Dwight Albert

    1977-01-01

    The Round Valley Indian Reservation in northern California obtains most of its water from the ground-water reservoir. The ground-water reservoir is made up of continental deposits, alluvium, and stream-channel deposits ranging in age from Pliocene to Holocene. Most of the water is pumped from the alluvium. Most ground water (about 20,000 acre-feet or 25 cubic hectometers per year) is derived from stream seepage. Natural discharge (discharge to streams, evapotranspiration, and underflow) has averaged about 21,000 acre-feet per year. Pumping and flow from artesian wells has averaged about 2,750 acre-feet per year. Ground water occurs in both confined and unconfined aquifers. The ground-water reservoir is full, and about 230,000 acre-feet of water is stored in the depth interval 10-200 feet. The water is chemically and biologically suitable for domestic or irrigation use, although hardness is high for domestic use and, locally, dissolved iron is a problem. There is potential for developing additional ground-water supplies. (Woodard-USGS)

  8. A debris avalanche at Forest Falls, San Bernardino County, California, July 11, 1999

    USGS Publications Warehouse

    Morton, Douglas M.; Hauser, Rachel M.

    2001-01-01

    The community of Forest Falls, California, is frequently subject to relatively slow moving debris flows. Some 11 debris flow events that were destructive to property have been recorded between 1955 and 1998. On July 11 and 13, 1999, debris flows again occurred, produced by high-intensity, short-duration monsoon rains. Unlike previous debris flow events, the July 11 rainfall generated a high-velocity debris avalanche in Snow Creek, one of the several creeks crossing the composite, debris flow dominated, alluvial fan on which Forest Falls is located. This debris avalanche overshot the bank of the active debris flow channel of Snow Creek, destroying property in the near vicinity and taking a life. The minimum velocity of this avalanche is calculated to have been in the range of 40 to 55 miles per hour. Impact from high-velocity boulders removed trees where the avalanche overshot the channel bank. Further down the fan, the rapidly moving debris fragmented the outer parts of the upslope side of large pine trees and embedded rock fragments into the tree trunks. Unlike the characteristic deposits formed by debris flows, the avalanche spread out down-slope and left no deposit suggestive of a debris avalanche. This summer monsoon-generated debris avalanche is apparently the first recorded for Forest Falls. The best indications of past debris avalanches may be the degree of permanent scars produced by extensive abrasion and splintering of the outer parts of pine trees that were in the path of an avalanche.

  9. Artificial recharge in the Waterman Canyon-East Twin Creek area, San Bernardino County, California

    USGS Publications Warehouse

    Warner, J.W.; Moreland, J.A.

    1973-01-01

    This is a study of the feasibility of recharging, in the Waterman Canyon-East Twin Creek area, imported water from northern California by way of the State Water Project beginning in 1972. The feasibility of recharging 30,000 acre-feet of water a year in the Waterman Canyon-East Twin Creek area will depend on the effectiveness of fault K as a barrier to ground-water movement near the land surface. The results of test drilling and an infiltration test indicate that the subsurface material at the spreading grounds is permeable enough to allow recharged water to percolate to the water table. The data indicate that fault K extends into the Waterman Canyon-East Twin Creek area and may impede the lateral movement of recharged water. Fault K has no known surface expression and therefore probably does not affect the highly permeable younger alluvium. If that is so, fault K will be less effective as a barrier to ground-water movement as the recharge mound rises. Monitoring of the observation wells near the spreading grounds as the planned recharge operation proceeds should provide data about the hydrologic effects of fault K near the land surface.

  10. Hydrologic data, 1974-77, Stovepipe Wells Hotel area, Death Valley National Monument, Inyo County, California

    USGS Publications Warehouse

    Lamb, Charles Edwin; Downing, D.J.

    1979-01-01

    Ground-water levels in most wells did not change significantly from 1974 to 1977 in the Stovepipe Wells Hotel area, California. The average water-level decline was less than 0.10 foot between August 1974 and August 1977 in 10 observation wells. Water-level contours show a depression centered on the two pumping wells, but this depression existed before the National Park Service started pumping its well. The chemical quality of the ground water is poor. Dissolved-solids concentrations in water samples ranged from 2,730 to 6,490 milligrams per liter. Analyses of water samples from two wells showed large changes in some constituents from 1976 to 1977. Streamflow in Salt Creek has been monitored since February 1974. Base flow is seasonal, being 0.10 to 0.20 cubic foot per second during the summer and as much as three times that amount during the winter. Two chemical analyses of water from Salt Creek, representing summer and winter flow conditions, show large differences for many constituents. (Woodard-USGS)

  11. Comments on potential geologic and seismic hazards affecting Mare Island, Solano County, California

    USGS Publications Warehouse

    Holzer, T.L.; Wentworth, C.M.; Bakun, W.H.; Boatwright, J.; Brocher, T.E.; Çelebi, M.; Ellsworth, W.L.; Fletcher, J.P.B.; Geist, E.L.; Graymer, R.W.; Kayen, R.E.; Keefer, D.K.; Oppenheimer, D.H.; Savage, W.U.; Schwartz, D.P.; Simpson, R.W.

    2002-01-01

    This report was prepared in response to a written request from the City of Vallejo, California, to the U.S. Geological Survey (USGS). By letter of October 4, 2002, the City requested that the USGS "provide advice to the City’s LNG Health and Safety Committee on its review of a potential liquid natural gas project" on the southern portion of Mare Island. The City specifically requested that the USGS advise the committee on potential hazards including fault rupture, earthquake ground motion, soil failure during earthquakes, tsunami and seiche, and landslides. The City requested that the USGS: (1) comment on these hazards, (2) describe its degree of confidence in its opinions, and (3) describe the scope of additional studies that will be needed if the City enters into an agreement with project sponsors. Advice was also requested on the selection of the safe shutdown and operating basis earthquakes as specified in the NFPA 59A standard (NFPA, 2001). This review of published reports and other publicly available information indicates that all of the hazards on which the USGS was asked to comment should be considered for the proposed project on the southern portion of Mare Island. Available information differs greatly for each of these potential hazards, and adequate understanding for design will require detailed site-specific investigations.

  12. Honey Lake hybrid geothermal wood residue power plant, Lassen County, California

    SciTech Connect

    Not Available

    1982-06-01

    The feasibility of a proposed 50 MW (gross) electric power project located near Wendel, California about 25 miles east of Susanville was studied. The project would be the first commercial power plant to combine the use of geothermal energy and wood fuel for power production. Wood fuel consisting primarily of various forms of forest management residues would be processed and partially dehydrated with geothermal energy prior to combustion. Geothermal energy would also be used for boiler feedwater heating and combustion air preheating. The study defines the range of site-specific benefits and economics of using wood fuel and moderate temperature geothermal energy, both of which are abundant and often located in proximity at many locations in the western United States. The study results document conclusively that overall project economics can be very favorable and that in addition to providing an important source of electric power, many benefits to forest land managers, local communities, project developers and the state of the environment can be derived from the combined use of moderate temperature geothermal energy and wood fuel.

  13. Swath bathymetric survey of Englebright Lake, Yuba-Nevada Counties, California

    USGS Publications Warehouse

    Childs, Jonathan R.; Stevenson, Andrew J.

    2006-01-01

    In March, 2004, the USGS conducted a swath bathymetric survey of Englebright Lake, a 9-mile long reservoir located in the Sierra Nevada foothills of northern California on the Yuba River. This survey was follow-on to an earlier bathymetric survey and sediment thickness analysis done by the USGS in 2001 (Childs and others, 2003). The primary purpose of these studies is to assess the quantity and nature of the sediment that has accumulated since the dam was completed in 1940. The specific purpose of the swath bathymetry was to map in high detail the prograding delta that is being formed as the lake fills in with sediment. In the event of another large flood such as occurred on January 1, 1997, the survey could be repeated to determine the effect of such an event on the sediment volume and distribution. This study was conducted under the auspices of the Upper Yuba River Studies Program (UYRSP) . The UYRSP is funded by the CALFED Bay-Delta Program, whose mission is to "develop and implement a long-term comprehensive plan that will restore ecological health and improve water management for beneficial uses of the San Francisco Bay-Delta System".

  14. Deep Springs fault, Inyo County, California: An example of the use of relative-dating techniques

    SciTech Connect

    Bryant, W.A.

    1989-11-01

    This article summarizes faulting in the Deep Springs Valley area, which was studied as part of a systematic evaluation of potentially active faults throughout California by the Division of Mines and Geology. Evaluation of surface fault-rupture hazard is authorized by the Alquist-Priolo Special Studies Zones Act of 1972. This act requires the State Geologist to delineate regulatory zones for faults that are well defined and show that displacement occurred during the last 11,000 years. Fault evaluations for the Division of Mines and Geology Fault Evaluation and Zoning Project are conducted at a detailed reconnaissance level. Evaluations are mainly based on aerial photographic interpretation in which ephemeral fault-produced landforms are identified and mapped. Young alluvial deposits and geomorphic surfaces are identified as either offset or not offset by faults. Field mapping is conducted to verify fault-related geomorphic features and to estimate ages of faulted and unfaulted deposits. The section on scarp degradation and relative dating techniques provides a brief survey of methods used in studies of the Basin and Range province. In these investigations geomorphic evidence is applied to determine the recency of faulting.

  15. Final Report: Natural State Models of The Geysers Geothermal System, Sonoma County, California

    SciTech Connect

    T. H. Brikowski; D. L. Norton; D. D. Blackwell

    2001-12-31

    Final project report of natural state modeling effort for The Geysers geothermal field, California. Initial models examined the liquid-dominated state of the system, based on geologic constraints and calibrated to match observed whole rock delta-O18 isotope alteration. These models demonstrated that the early system was of generally low permeability (around 10{sup -12} m{sup 2}), with good hydraulic connectivity at depth (along the intrusive contact) and an intact caprock. Later effort in the project was directed at development of a two-phase, supercritical flow simulation package (EOS1sc) to accompany the Tough2 flow simulator. Geysers models made using this package show that ''simmering'', or the transient migration of vapor bubbles through the hydrothermal system, is the dominant transition state as the system progresses to vapor-dominated. Such a system is highly variable in space and time, making the rock record more difficult to interpret, since pressure-temperature indicators likely reflect only local, short duration conditions.

  16. Map Showing Seacliff Response to Climatic and Seismic Events, Seabright Beach, Santa Cruz County, California

    USGS Publications Warehouse

    Hapke, Cheryl J.; Richmond, Bruce M.; D'Iorio, Mimi M.

    2002-01-01

    Introduction The coastal cliffs along much of the central California coast are actively retreating. Large storms and periodic earthquakes are responsible for most of the documented sea cliff slope failures. Long-term average erosion rates calculated for this section of coast do not provide the spatial or temporal data resolution necessary to identify the processes responsible for retreat of the sea cliffs where episodic retreat threatens homes and community infrastructure. Research suggests that more erosion occurs along the California coast over a short time scale, during periods of severe storms or seismic activity, than occurs during decades of normal weather or seismic quiescence. This is the third map in a series of maps prepared to document the processes of short-term sea cliff retreat through the identification of slope failure styles, spatial variability of failures, and temporal variation in retreat amounts in an area that has been identified as an erosion hotspot. This map presents sea cliff failure and retreat data from the Seabright Beach section, California, which is located on the east side of Santa Cruz along the northern Monterey Bay coast. The data presented in this map series provide high-resolution spatial and temporal information on the location, amount, and processes of sea cliff retreat in Santa Cruz, California. These data show the response of the sea cliffs to both large magnitude earthquakes and severe climatic events such as El Ni?os; this information may prove useful in predicting the future response of the cliffs to events of similar magnitude. The map data can also be incorporated into Global Information System (GIS) for use by researchers and community planners. During this study we developed a method for investigating short-term processes of sea cliff evolution using rectified photographic stereo models. This method allows us to document the linear extent of cliff failures, the spatial and temporal relationship between failures, and

  17. Water quality of the Lexington Reservoir, Santa Clara County, California, 1978-80

    USGS Publications Warehouse

    Iwatsubo, R.T.; Sylvester, M.A.; Gloege, I.S.

    1988-01-01

    Analysis of water samples from Lexington Reservoir and Los Gatos Creek upstream from the reservoir from June 1978 through September 1980 showed that water generally met water-quality objectives identified by California Regional Water Quality Control Board, San Francisco Bay Region. Water-temperature profiles show that Lexington Reservoir is a warm monomictic lake. During summer, dissolved-oxygen concentrations generally were not reduced below 5.0 mg/L in the hyplimnion; only once during the study did bottom waters become anoxic. Water transparency decreased with depth. The euphotic zone ranged from 1.0 to 5.4 m, depending on suspended solids and algae, and was greater in summer than in spring. Calcium and bicarbonate were dominant ions at all stations except during spring, following the rainy season, when waters were a mixed cation bicarbonate type. Nitrogen concentrations were greater in samples from reservoir stations than in those from Los Gatos Creek, with most of the nitrogen in ammonia and organic forms. The amount of dissolved nitrate appeared to be related to phytoplankton abundance. Phosphorus and trace-element concentrations were low at all stations. Estimates of net primary productivity and Carlson 's trophic-state index, based on chlorophyll-a concentrations, indicated that reservoir classification ranges from oligotrophic to mesotrophic. Blue-green algae generally were predominant in reservoir samples. (USGS)

  18. Management by assertion: beavers and songbirds at Lake Skinner (Riverside County, California).

    PubMed

    Longcore, Travis; Rich, Catherine; Müller-Schwarze, Dietland

    2007-04-01

    Management of ecological reserve lands should rely on the best available science to achieve the goal of biodiversity conservation. "Adaptive Resource Management" is the current template to ensure that management decisions are reasoned and that decisions increase understanding of the system being managed. In systems with little human disturbance, certain management decisions are clear; steps to protect native species usually include the removal of invasive species. In highly modified systems, however, appropriate management steps to conserve biodiversity are not as readily evident. Managers must, more than ever, rely upon the development and testing of hypotheses to make rational management decisions. We present a case study of modern reserve management wherein beavers (Castor canadensis) were suspected of destroying habitat for endangered songbirds (least Bell's vireo, Vireo bellii pusillus, and southwestern willow flycatcher, Empidonax traillii extimus) and for promoting the invasion of an exotic plant (tamarisk, Tamarix spp.) at an artificial reservoir in southern California. This case study documents the consequences of failing to follow the process of Adaptive Resource Management. Managers made decisions that were unsupported by the scientific literature, and actions taken were likely counterproductive. The opportunity to increase knowledge of the ecosystem was lost. Uninformed management decisions, essentially "management by assertion," undermine the long-term prospects for biodiversity conservation. PMID:17318698

  19. Nature and chlorine reactivity of organic constituents from reclaimed water in groundwater, Los Angeles County, California

    USGS Publications Warehouse

    Leenheer, J.A.; Rostad, C.E.; Barber, L.B.; Schroeder, R.A.; Anders, R.; Davisson, M.L.

    2001-01-01

    The nature and chlorine reactivity of organic constituents in reclaimed water (tertiary-treated municipal wastewater) before, during, and after recharge into groundwater at the Montebello Forebay in Los Angeles County, CA, was the focus of this study. Dissolved organic matter (DOM) in reclaimed water from this site is primarily a mixture of aromatic sulfonates from anionic surfactant degradation, N-acetyl amino sugars and proteins from bacterial activity, and natural fulvic acid, whereas DOM from native groundwaters in the aquifer to which reclaimed water was recharged consists of natural fulvic acids. The hydrophilic neutral N-acetyl amino sugars that constitute 40% of the DOM in reclaimed water are removed during the first 3 m of vertical infiltration in the recharge basin. Groundwater age dating with 3H and 3He isotopes, and determinations of organic and inorganic C isotopes, enabled clear differentiation of recent recharged water from older native groundwater. Phenol structures in natural fulvic acids in DOM isolated from groundwater produced significant trihalomethanes (THM) and total organic halogen (TOX) yields upon chlorination, and these structures also were responsible for the enhanced SUVA and specific fluorescence characteristics relative to DOM in reclaimed water. Aromatic sulfonates and fulvic acids in reclaimed water DOM produced minimal THM and TOX yields.

  20. Chromium geochemistry of serpentinous sediment in the Willow core, Santa Clara County, California

    USGS Publications Warehouse

    Oze, Christopher J.; LaForce, Matthew J.; Wentworth, Carl M.; Hanson, Randall T.; Bird, Dennis K.; Coleman, Robert G.

    2003-01-01

    A preliminary investigation of Cr geochemistry in serpentinous sediment completed for a multiple-aquifer ground-water monitoring well (Willow core of Santa Clara County, CA) determined sediment at depths >225 meters contains Cr concentrations ranging from 195 to 1155 mg/kg. Serpentinous sediment from this site is a potential source of non-anthropogenic Cr contamination. Chromium-bearing minerals such as Cr-spinel appear to be the main source of Cr in the sediment; however, Cr-bearing silicates and clay minerals are additional Cr sources. Aqueous Cr concentrations in the sediment are <4.6 mg/L; however, the valence of Cr was not identified in the solutions or in the sediment. Although there is no indication of Cr(VI) contamination derived from the serpentinous sediment, elevated Cr concentrations in the sediment, the observed ‘dissolution’ textures of the Cr-bearing minerals, the estimated redox environment, and water chemistry indicate the formation of Cr(VI) is potentially favorable.

  1. Indicators assessment for habitat conservation plan of Yolo County, California, USA

    SciTech Connect

    Smallwood, K.S.; Wilcox, B.; Leidy, R.; Yarris, K.

    1998-11-01

    Whereas habitat conservation plans (HCPs) have been intended to provide comprehensive environmental mitigation for multiple species, they often narrow in focus to one species and either one mitigation site or unspecified sites. The authors developed an indicators framework from which to rate land units for their ecological integrity, collateral values (nonbiological qualities that can improve conservation), and restoration and conservation opportunities. The ratings of land units were guided by the tenets of conservation biology and principles of landscape and ecosystem ecology, and they were made using existing physical and floral information managed on a GIS. As an example of how the indicators approach can be used for HCPs, the 29 legally rare species targeted by the Yolo County HCP were each associated with vegetation complexes and agricultural crops, the maps of which were used for rating some of the landscape indices. The ratings were mapped so that mitigation can be directed to the places on the landscape where the legally rare species should benefit most from conservation practices. The most highly rated land units for conservation opportunity occurred along streams and sloughs, especially where they emerged from the foothills and entered the Central Valley and where the two largest creeks intersected the Sacramento River flood basin.

  2. A water-quality monitoring network for Vallecitos Valley, Alameda County, California

    USGS Publications Warehouse

    Farrar, C.D.

    1980-01-01

    A water-quality monitoring network is proposed to detect the presence of and trace the movement of radioisotopes in the hydrologic system in the vicinity of the Vallecitos Nuclear Center, Alameda County, Calif. The source of the radioisotopes is treated industrial wastewater from the Vallecitos Nuclear Center that is discharged into an unnamed tributary of Vallecitos Creek. The effluent infiltrates the alluvium along the stream course, percolates downward to the water table, and mixes with the native ground water in the subsurface. The average daily discharge of effluent to the hydrologic system in 1978 was about 100,000 gallons. In Vallecitos Valley, the Livermore Gravel and the overlying alluvium constitute the groundwater reservoir. There is no subsurface inflow from adjacent groundwater basins. Groundwater flow in the Vallecitos subbasin is toward the southwest. The proposed network consists of four surface-water sampling sites and six wells to sample the groundwater system. Samples collected monthly at each site and analyzed for tritium and for alpha, beta, and gamma radiation would provide adequate data for monitoring. (USGS)

  3. McGee Mountain Geoprobe Survey, Humboldt County, Nevada

    DOE Data Explorer

    Richard Zehner

    2010-01-01

    This shapefile contains location and attribute data for a Geoprobe temperature survey conducted by Geothermal Technical Partners, Inc. during 2010. The purpose of direct push technology (“DPT”) probe activity at the McGee Mtn. Project, Nevada was to 1) determine bottom hole temperatures using nominal 1.5 inch probe tooling to place resistance temperature detectors (“RTD”) and 2) take water samples, if possible, to characterize the geothermometry of the system. A total of 23 holes were probed in five days for a cumulative total of 857.5 ft. at 21 sites at McGee Mountain. The probed holes ranged in depth from a maximum of 75 ft to a minimum of 10 ft and averaged 37.3ft. The average temperature of the 23 holes was 18.9⁰C, with a range of 12.0⁰C at site MMTG#1b to 42.0⁰C at site MMTG#19. . No water was encountered in any of the probed holes, with the exception of MMTG#10, and no water was collected for sampling. Zip file containing Arcview shapefile in UTM11 NAD83 projection. 5kb file size.

  4. 75 FR 51238 - Tehama County Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-08-19

    ...; ] DEPARTMENT OF AGRICULTURE Forest Service Tehama County Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The Tehama County Resource Advisory Committee (RAC) will meet..., Mendocino National Forest, Grindstone Ranger District, 825 N. Humboldt Ave., Willows, CA 95988. (530)...

  5. 76 FR 39376 - Glenn/Colusa County Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-06

    ... Forest Service Glenn/Colusa County Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of Meeting. SUMMARY: The Glenn/Colusa County Resource Advisory Committee (RAC) will meet in... monitoring trip beginning at the Mendocino NF Supervisor's Office, 825 North Humboldt Ave., Willows,...

  6. Tectonically-beheaded drainages (wind gaps), Palmdale area, Los Angeles, County, California

    SciTech Connect

    Lachapelle, W.A. ); Shlemon, R.J.

    1993-04-01

    Five discrete wind gaps, informally designated 1 (west) through 5 (east), occur along a 6.5 km distance between the Anaverde water gap on the west and the Old Harold Road drainage on the east at Palmdale, California. Aerial photographic and geomorphic interpretations combined with boring and trench logs indicate that the windgaps were once courses of low-order, northward-flowing drainages now beheaded by the San Andreas Fault (SAF). Wind gaps 2 through 5 now contain only intermittent underfit streams, but are bordered by remnants of high-level fluvial terrace gravels attesting to long periods of flow across the SAF before cutoff by tectonic displacement. Representative wind gap 5 contains approximately 6-m of fining-upward sands and silts, and yields an approximately 10,000-yr radiocarbon date from near the base of the section. Based mainly on wind gap morphology and on an average right-lateral slip rate of about 35 mm/yr for this segment of the SAF, the authors suggest three possible hypotheses to account for the origin of the Palmdale area wind gaps: (1) they were beheaded by continual lateral movement of the SAF; (2) they maintained flow across the SAF during much of Pleistocene time, but were eventually defeated by an increasing rate of slip in latest Pleistocene time or (3) they continued flow across the SAF until latest Pleistocene time, particularly during pluvial epochs, but were eventually cut off owing to the onset of more aridic climatic and sedimentation regimes in early Holocene time.

  7. Traffic-Related Air Toxics and Term Low Birth Weight in Los Angeles County, California

    PubMed Central

    Ghosh, Jo Kay; Su, Jason; Cockburn, Myles; Jerrett, Michael; Ritz, Beate

    2011-01-01

    Background: Numerous studies have linked criteria air pollutants with adverse birth outcomes, but there is less information on the importance of specific emission sources, such as traffic, and air toxics. Objectives: We used three exposure data sources to examine odds of term low birth weight (LBW) in Los Angeles, California, women when exposed to high levels of traffic-related air pollutants during pregnancy. Methods: We identified term births during 1 June 2004 to 30 March 2006 to women residing within 5 miles of a South Coast Air Quality Management District (SCAQMD) Multiple Air Toxics Exposure Study (MATES III) monitoring station. Pregnancy period average exposures were estimated for air toxics, including polycyclic aromatic hydrocarbons (PAHs), source-specific particulate matter < 2.5 μm in aerodynamic diameter (PM2.5) based on a chemical mass balance model, criteria air pollutants from government monitoring data, and land use regression (LUR) model estimates of nitric oxide (NO), nitrogen dioxide (NO2) and nitrogen oxides (NOx). Associations between these metrics and odds of term LBW (< 2,500 g) were examined using logistic regression. Results: Odds of term LBW increased approximately 5% per interquartile range increase in entire pregnancy exposures to several correlated traffic pollutants: LUR measures of NO, NO2, and NOx, elemental carbon, and PM2.5 from diesel and gasoline combustion and paved road dust (geological PM2.5). Conclusions: These analyses provide additional evidence of the potential impact of traffic-related air pollution on fetal growth. Particles from traffic sources should be a focus of future studies. PMID:21835727

  8. Geologic and Geophysical Framework of the Santa Rosa 7.5' Quadrangle, Sonoma County, California

    USGS Publications Warehouse

    McLaughlin, R.J.; Langenheim, V.E.; Sarna-Wojcicki, A. M.; Fleck, R.J.; McPhee, D.K.; Roberts, C.W.; McCabe, C.A.; Wan, Elmira

    2008-01-01

    The geologic and geophysical maps of Santa Rosa 7.5? quadrangle and accompanying structure sections portray the sedimentary and volcanic stratigraphy and crustal structure of the Santa Rosa 7.5? quadrangle and provide a context for interpreting the evolution of volcanism and active faulting in this region. The quadrangle is located in the California Coast Ranges north of San Francisco Bay and is traversed by the active Rodgers Creek, Healdsburg and Maacama Fault Zones. The geologic and geophysical data presented in this report, are substantial improvements over previous geologic and geophysical maps of the Santa Rosa area, allowing us to address important geologic issues. First, the geologic mapping is integrated with gravity and magnetic data, allowing us to depict the thicknesses of Cenozoic deposits, the depth and configuration of the Mesozoic basement surface, and the geometry of fault structures beneath this region to depths of several kilometers. This information has important implications for constraining the geometries of major active faults and for understanding and predicting the distribution and intensity of damage from ground shaking during earthquakes. Secondly, the geologic map and the accompanying description of the area describe in detail the distribution, geometry and complexity of faulting associated with the Rodgers Creek, Healdsburg and Bennett Valley Fault Zones and associated faults in the Santa Rosa quadrangle. The timing of fault movements is constrained by new 40Ar/39Ar ages and tephrochronologic correlations. These new data provide a better understanding of the stratigraphy of the extensive sedimentary and volcanic cover in the area and, in particular, clarify the formational affinities of Pliocene and Pleistocene nonmarine sedimentary units in the map area. Thirdly, the geophysics, particularly gravity data, indicate the locations of thick sections of sedimentary and volcanic fill within ground water basins of the Santa Rosa plain and

  9. GLORIA Alpine Plant Monitoring in the White Mountains, Inyo County, California.

    NASA Astrophysics Data System (ADS)

    Jayko, A.; Powell, F. L.; Smiley, J. T.; Pritchett, D.; Dennis, A.; Millar, C. I.; Murrell, K. E.

    2004-12-01

    The GLORIA project (Global Observation Research Initiative in Alpine Environments: www.gloria.ac.at) is a worldwide effort coordinated by the University of Vienna Institute of Ecology and Conservation Biology, to monitor climate effects on alpine peaks around the world. In the summer of 2004 the University of California, White Mountain Research Station teamed up with the U.S. Forest Service to initiate GLORIA monitoring sites on 4 summits in the White Mountains. The lower three summits consist of granitic rock, and range from 3240m to 3975m in elevation, while the upper summit is on metavolcanic rock on the shoulder of White Mountain Peak at 4285m. For each summit we followed the rigorous GLORIA sampling design and recorded baseline data on plant species composition, cover, and frequency. Permanent monitoring plots were set up, and dataloggers installed to measure soil temperature. In addition, we are discussing ways to augment the standard GLORIA sampling protocol by setting up a White Mountain "GLORIA master site." This would involve (1) remeasurement of the GLORIA summits using alternative sampling procedures, for example random quadrat sampling, to facilitate cross-comparison with other monitoring efforts by agency and university scientists, (2) a parallel summit transect on a chemically contrasting bedrock lithology, formally known as the Reed Dolomite, which produces magnesium-rich carbonate soils, and is the principle host rock to the ancient Bristlecone forest, .and (3) expanding sampling to include animal taxa. We also plan to complete a detailed geomorphic and geologic description of each site to include in the monitoring database. project/default.htm

  10. Properties of basin-fill deposits, a 1971–2000 water budget, and surface-water-groundwater interactions in the upper Humboldt River basin, northeastern Nevada

    USGS Publications Warehouse

    Plume, Russell W.; Smith, Jody L.

    2013-01-01

    This study was done in cooperation with Elko County, Nevada in response to concerns over growing demand for water within the county and increasing external demands that are occurring statewide. The upper Humboldt River basin encompasses 4,360 square miles in northeastern Nevada and includes the headwaters area of the Humboldt River. Nearly all of the mean annual flow of the Humboldt River originates in this area. Basin-fill deposits function as the principal aquifers in the upper Humboldt River basin. Over much of the basin lowlands, the upper 200 feet of basin fill consists of clay, silt, sand, and gravel deposited in a lake of middle to late Pliocene age. Fine-grained lacustrine sediments compose from 30 to more than 70 percent of the deposits. Mean values of transmissivity are less than 1,000 feet squared per day. Total inflow to the upper Humboldt River basin, about 3,330,000 acre-feet per year, is entirely from annual precipitation. Total outflow from the basin, about 3,330,000 acre-feet per year, occurs as evapotranspiration, streamflow, subsurface flow, and pumpage. The uncertainty of these values of inflow and outflow is estimated to be 25 percent. Baseflow of the Humboldt River is minimal upstream of the Elko Hills and in downstream reaches almost all baseflow comes from tributary inflow of the North Fork and South Fork Humboldt Rivers. However, the baseflow of these two tributaries comes from groundwater discharge to their respective channels in canyons incised in volcanic rocks along the North Fork and in carbonate rocks along the South Fork. Water levels in the shallow water-table aquifer along the Humboldt River flood plain fluctuate with changes in stage of the river. During high rising river stage in spring and early summer, streamflow enters the aquifer as bank storage. As stage begins to decline in early to mid-summer groundwater in bank storage begins discharging back into the river channel and this continues through late summer. In years of below

  11. Accuracy of Perceived Estimated Travel Time by EMS to a Trauma Center in San Bernardino County, California

    PubMed Central

    Neeki, Michael M.; MacNeil, Colin; Toy, Jake; Dong, Fanglong; Vara, Richard; Powell, Joe; Pennington, Troy; Kwong, Eugene

    2016-01-01

    Introduction Mobilization of trauma resources has the potential to cause ripple effects throughout hospital operations. One major factor affecting efficient utilization of trauma resources is a discrepancy between the prehospital estimated time of arrival (ETA) as communicated by emergency medical services (EMS) personnel and their actual time of arrival (TOA). The current study aimed to assess the accuracy of the perceived prehospital estimated arrival time by EMS personnel in comparison to their actual arrival time at a Level II trauma center in San Bernardino County, California. Methods This retrospective study included traumas classified as alerts or activations that were transported to Arrowhead Regional Medical Center in 2013. We obtained estimated arrival time and actual arrival time for each transport from the Surgery Department Trauma Registry. The difference between the median of ETA and actual TOA by EMS crews to the trauma center was calculated for these transports. Additional variables assessed included time of day and month during which the transport took place. Results A total of 2,454 patients classified as traumas were identified in the Surgery Department Trauma Registry. After exclusion of trauma consults, walk-ins, handoffs between agencies, downgraded traumas, traumas missing information, and traumas transported by agencies other than American Medical Response, Ontario Fire, Rialto Fire or San Bernardino County Fire, we included a final sample size of 555 alert and activation classified traumas in the final analysis. When combining all transports by the included EMS agencies, the median of the ETA was 10 minutes and the median of the actual TOA was 22 minutes (median of difference=9 minutes, p<0.0001). Furthermore, when comparing the difference between trauma alerts and activations, trauma activations demonstrated an equal or larger difference in the median of the estimated and actual time of arrival (p<0.0001). We also found month and time of

  12. Controlled Landfill Project in Yolo County, California for Environmental Benefits of Waste Stabilization and Minimization of Greenhouse Gas Emissions

    NASA Astrophysics Data System (ADS)

    Yazdani, R.; Augenstein, D.; Kieffer, J.; Cohen, K.

    2003-12-01

    The Department of Public Works of Yolo County, California, USA has been testing an advanced approach to landfill bioreactors, controlled (or "enhanced") landfilling, at its Yolo County Central Landfill site near Davis, CA, since 1994. Overall objectives have been the management of waste landfilling for: (1) rapid completion of total gas generation; (2) maximum, high-efficiency gas capture; (3) waste volume reduction; and (4) maximum greenhouse gas and carbon sequestration benefits. Methane generation is controlled and enhanced through carefully managed moisture additions, and by taking advantage of landfill temperature elevation. The generated landfill methane, an important greenhouse gas, is recovered with high efficiency through extraction from a porous recovery layer beneath a surface geomembrane cover. Instrumentation included a total of 56 moisture and 15 temperature sensors in the two cells, gas flow monitoring by positive displacement gas meters, and accurate quantification of liquid inputs and outputs. Gas composition, waste volume reduction, base hydrostatic head, and a range of environmental compliance parameters has been monitored since 1995. Partitioning gas tracer tests using the injection of two gases at dilute concentrations in the landfill have also been initiated to compute the fraction of pore space occupied by water between the points of tracer injection and tracer measurement. There has been rapid waste volume reduction in the enhanced cell that corresponds to the solids' reduction to gas. Monitoring is planned for the next several years, until stabilization parameters are determined complete. Encouraging performance is indicated by: (1) sensor data; (2) gas generation results; (3) data from landfill cores; and (4) decomposition-related indicators including rapid volume reduction. When data are synthesized, project results have attractive implications for new approaches to landfill management. Over seven-years, methane recoveries have averaged

  13. Shallow Structure of the Eagle Rock and Raymond Faults in Arroyo Seco, Los Angeles County, California

    NASA Astrophysics Data System (ADS)

    Scheirer, D. S.; Rymer, M. J.; Catchings, R. D.; Goldman, M.; Fuis, G.

    2012-12-01

    To understand the location, dip, and possible structural connection of the Eagle Rock and Raymond faults in Pasadena and South Pasadena, California, we acquired and analyzed high-resolution seismic reflection and refraction data, as well as gravity observations, along the floor of the Arroyo Seco. The studies were conducted to aid in understanding the seismic hazards of these faults in this urban setting. Seismic reflection and refraction data, including both P-wave and S-wave records, were collected along two profiles, a 1.2-km-long northern profile crossing the Eagle Rock fault, and a 450-m-long southern profile crossing the Raymond fault. Seismic sources were Betsy-Seisgun shots, accelerated weight drops, and repeated sledge-hammer impacts, which were recorded on multi-channel seismograph systems connected to vertical- and horizontal-component geophones spaced at a 5-m interval. Gravity data were collected along a single ~3-km-long profile coincident with and extending beyond and between the two seismic profiles, with stations spaced every 25-m near the fault traces and at greater intervals farther from the fault traces. We carefully accounted for the gravity effects of the adjacent concrete drainage channel and of the walls of the arroyo, to generate gravity anomalies that reflect sub-surface density contrasts across the Eagle Rock and Raymond faults. Seismic reflection image quality is compromised by the highly-deformed Miocene strata offset by these faults. However, reflection and especially refraction results indicate that both the Eagle Rock and Raymond faults consist of multiple, steeply-north-dipping fault strands. P- and S-wave seismic tomography results of the uppermost 50-100 m yield velocity variations that can be converted to probable density variations, and thus be included in the gravity anomaly analysis. The gravity anomalies predicted from the velocity variations account for less than one-third of the anomalies observed across the faults

  14. Environmental assessment of water, sediment, and biota collected from the Bear Creek watershed, Colusa County, California

    USGS Publications Warehouse

    Rytuba, James J.; Hothem, Roger L.; Brussee, Brianne E.; Goldstein, Daniel; May, Jason T.

    2015-01-01

    The Cache Creek watershed lies within California's North Coast Range, an area with abundant geologic sources of mercury (Hg) and a long history of Hg contamination (Rytuba, 2000). Bear Creek, Cache Creek, and the North Fork of Cache Creek are the major streams of the Cache Creek watershed, encompassing 2978 km2. The Cache Creek watershed contains soils naturally enriched in Hg as well as natural springs (both hot and cold) with varying levels of aqueous Hg (Domagalski and others, 2004, Suchanek and others, 2004, Holloway and others 2009). All three tributaries are known to be significant sources of anthropogenically derived Hg from historic mines, both Hg and gold (Au), and associated ore storage/processing sites and facilities (Slotton and others, 1995, 2004; CVRWQCB, 2003; Schwarzbach and others, 2001; Gassel and others, 2005; Suchanek and others., 2004, 2008a, 2009). Historically, two of the primary sources of mercury contamination in the upper part of Bear Creek have been the Rathburn and Petray Hg Mines. The Rathburn Hg mine was discovered and initially mined in the early 1890s. The Rathburn and the more recently developed Petray open pit mines are localized along fault zones in serpentinite that has been altered and cut by quartz and chalcedony veins. Cold saline-carbonate springs are located perepheral to the Hg deposits and effluent from the springs locally has high concentrations of Hg (Slowey and Rytuba, 2008). Several ephemeral tributaries to Bear Creek drain the mine area which is located on federal land managed by the U.S. Bureau of Land Management (USBLM). The USBLM requested that the U.S. Geological Survey (USGS) measure and characterize Hg and other geochemical constituents in sediment, water, and biota to establish baseline information prior to remediation of the Rathburn and Petray mines. Samples sites were established in Bear Creek upstream and downstream from the mine area. This report is made in response to the USBLM request, the lead agency

  15. Arsenic speciation in pyrite and secondary weathering phases, Mother Lode gold district, Tuolumne County, California

    SciTech Connect

    Savage, K.S.; Tingle, Tracy N.; O'Day, Peggy A.; Waychunas, Glenn A.; Bird, Dennis K.

    2004-10-27

    Arsenian pyrite, formed during Cretaceous gold mineralization, is the primary source of As along the Melones fault zone in the southern Mother Lode Gold District of California. Mine tailings and associated weathering products from partially submerged inactive gold mines at Don Pedro Reservoir, on the Tuolumne River, contain approx. 20-1300 ppm As. The highest concentrations are in weathering crusts from the Clio mine and nearby outcrops which contain goethite or jarosite. As is concentrated up to 2150 ppm in the fine-grained (<63 mu-m) fraction of these Fe-rich weathering products. Individual pyrite grains in albite-chlorite schists of the Clio mine tailings contain an average of 1.2 wt. percent As. Pyrite grains are coarsely zoned, with local As concentrations ranging from approx. 0 to 5 wt. percent. Electron microprobe, transmission electron microscope, and extended X-ray absorption fine-structure spectroscopy (EXAFS) analyses indicate that As substitutes for S in pyrite and is not present as inclusions of arsenopyrite or other As-bearing phases. Comparison with simulated EXAFS spectra demonstrates that As atoms are locally clustered in the pyrite lattice and that the unit cell of arsenian pyrite is expanded by approx. 2.6 percent relative to pure pyrite. During weathering, clustered substitution of As into pyrite may be responsible for accelerating oxidation, hydrolysis, and dissolution of arsenian pyrite relative to pure pyrite in weathered tailings. Arsenic K-edge EXAFS analysis of the fine-grained Fe-rich weathering products are consistent with corner-sharing between As(V) tetrahedra and Fe(III)-octahedra. Determinations of nearest-neighbor distances and atomic identities, generated from least-squares fitting algorithms to spectral data, indicate that arsenate tetrahedra are sorbed on goethite mineral surfaces but substitute for SO4 in jarosite. Erosional transport of As-bearing goethite and jarosite to Don Pedro Reservoir increases the potential for As

  16. Arsenic speciation in pyrite and secondary weathering phases, Mother Lode gold district, Tuolumne County, California

    SciTech Connect

    Savage, K.S.; Tingle, Tracy N.; O'Day, Peggy A.; Waychunas, Glenn A.; Bird, Dennis K.

    2004-10-27

    Arsenian pyrite, formed during Cretaceous gold mineralization, is the primary source of As along the Melones fault zone in the southern Mother Lode Gold District of California. Mine tailings and associated weathering products from partially submerged inactive gold mines at Don Pedro Reservoir, on the Tuolumne River, contain approx. 20-1300 ppm As. The highest concentrations are in weathering crusts from the Clio mine and nearby outcrops which contain goethite or jarosite. As is concentrated up to 2150 ppm in the fine-grained (<63 mu-m) fraction of these Fe-rich weathering products. Individual pyrite grains in albite-chlorite schists of the Clio mine tailings contain an average of 1.2 wt. percent As. Pyrite grains are coarsely zoned, with local As concentrations ranging from approx. 0 to 5 wt. percent. Electron microprobe, transmission electron microscope, and extended X-ray absorption fine-structure spectroscopy (EXAFS) analyses indicate that As substitutes for S in pyrite and is not p resent as inclusions of arsenopyrite or other As-bearing phases. Comparison with simulated EXAFS spectra demonstrates that As atoms are locally clustered in the pyrite lattice and that the unit cell of arsenian pyrite is expanded by approx. 2.6 percent relative to pure pyrite. During weathering, clustered substitution of As into pyrite may be responsible for accelerating oxidation, hydrolysis, and dissolution of arsenian pyrite relative to pure pyrite in weathered tailings. Arsenic K-edge EXAFS analysis of the fine-grained Fe-rich weathering products are consistent with corner-sharing between As(V) tetrahedra and Fe(III)-octahedra. Determinations of nearest-neighbor distances and atomic identities, generated from least-squares fitting algorithms to spectral data, indicate that arsenate tetrahedra are sorbed on goethite mineral surfaces but substitute for SO4 in jarosite. Erosional transport of As-bearing goethite and jarosite to Don Pedro Reservoir increases the potential for As

  17. Effects of a Wildfire and Salvage Logging on Hillslope Erosion: Star Fire, Placer County, California

    NASA Astrophysics Data System (ADS)

    Chase, E. H.; MacDonald, L. H.

    2004-12-01

    Post-fire erosion rates have been measured in many areas, but there are few published data on how salvage logging affects post-fire erosion. The primary objective of this study was to compare sediment production rates from sites burned at high severity and subjected to helicopter, cable, or tractor logging, respectively. Sediment production was measured with sediment fences on 32 logged sites and five unburned, unlogged sites over two wet seasons in the central Sierra Nevada of California. The independent variables measured on each site included slope, aspect, contributing area, percent bare soil, percent rocky outcrop, percent ground disturbance, soil texture, and soil water repellency. The first wet season had near-normal precipitation and a calculated erosivity of 556 MJ mm ha-1 h-1. Mean sediment production rates were 2.5 Mg ha-1 from the burned sites and zero from the unburned sites. The second wet season had only 13 MJ mm ha-1 h-1 of erosivity because most of the precipitation fell as snow, and the mean sediment production rate from the burned sites declined to 0.11 Mg ha-1. Mean sediment production rates did not significantly differ by logging type due to the high variability between sites in the first wet season and the very low sediment production rates in the second wet season. Slope, percent ground disturbance, and percent bare soil were significantly correlated with increasing sediment production per unit area. Percent ground disturbance was significantly higher for the cable- and tractor-logged sites than for the sites logged by helicopter (p<0.001), but there were no significant differences in percent bare soil by logging type. Sites logged by helicopter tended to have lower sediment production rates than cable-logged sites (p=0.086). The results indicate that logging methods that increase ground disturbance and bare soil will generate more sediment, but statistically significant differences in sediment production may be difficult to detect given the

  18. Reservoir compaction of the Belridge Diatomite and surface subsidence, south Belridge field, Kern County, California

    SciTech Connect

    Bowersox, J.R.; Shore, R.A. )

    1990-05-01

    Surface subsidence due to reservoir compaction during production has been observed in many large oil fields. Subsidence is most obvious in coastal and offshore fields where inundation by the sea occurs. Well-known examples are Wilmington field in California and Ekofisk field in the North Sea. In South Belridge field, the Belridge Diatomite member of the late Miocene Reef Ridge Shale has proven prone to compaction during production. The reservoir, a high-porosity, low-permeability, highly compressive rock composed largely of diatomite and mudstone, is about 1,000 ft thick and lies at an average depth of 1,600 ft. Within the Belridge Diatomite, reservoir compaction due to withdrawal of oil and water in Sec. 12, T28S, R20E, MDB and M, was noticed after casing failures in producing wells began occurring and tension cracks, enlarged by hydrocompaction after a heavy rainstorm were observed. Surface subsidence in Sec. 12 has been monitored since April 1987, through the surveying of benchmark monuments. The average annualized subsidence rate during 1987 was {minus}1.86 ft/yr, {minus}0.92 ft/yr during 1988, and {minus}0.65 ft/yr during 1989; the estimated peak subsidence rate reached {minus}7.50 ft/yr in July 1985, after 1.5 yrs of production from the Belridge Diatomite reservoir. Since production from the Belridge Diatomite reservoir commenced in February 1984, the surface of the 160-ac producing area has subsided about 12.5 ft. This equates to an estimated reservoir compaction of 30 ft in the Belridge Diatomite and an average loss of reservoir porosity of 2.4% from 55.2 to 52.8%. Injection of water for reservoir pressure maintenance in the Belridge diatomite began in June 1987, and has been effective in mitigating subsidence to current rates and repressurizing the reservoir to near-initial pressure. An added benefit of water injection has been improved recovery of oil from the Belridge Diatomite by waterflood.

  19. Predicting density of Ixodes pacificus nymphs in dense woodlands in Mendocino County, California, based on geographic information systems and remote sensing versus field-derived data.

    PubMed

    Eisen, Rebecca J; Eisen, Lars; Lane, Robert S

    2006-04-01

    Ixodes pacificus nymphs are the primary vectors to humans of Borrelia burgdorferi, the etiologic agent of Lyme disease, in California. We used a supervised classification model, based on remote sensing (RS) data from multi-seasonal Landsat TM 5 images, to identify the key habitat in Mendocino County where humans are exposed to I. pacificus nymphs (woodlands carpeted with leaf litter). The model, based on the normalized difference vegetation index (NDVI), brightness, and wetness, separated the nymphal risk habitat (52.6% of the county) from other habitat types with > 93% user and producer accuracies. Next, we determined the density of questing nymphs in 62 woodland-leaf areas located throughout Mendocino County and created forward-stepwise regression models explaining the variation in nymphal density based on traits attainable by a lay-person in the field (e.g., tree species present, deer signs; r(2) = 0.43, P < 0.0001), or geographic information systems (GIS)/RS-based environmental data (r(2) = 0.50, P < 0.0001). The GIS/RS model, using July NDVI, November greenness, a coastal influence category, May solar insolation, November hours of sunlight, and dominant hydrologic grouping as input variables, was 22% more accurate in predicting nymphal density at 16 validation sites (r(2) = 0.72) than the field-derived data model (r(2) = 0.50). The habitat classification and GIS/RS models were combined to create a continuous nymphal density surface for the entirety of Mendocino County. This risk surface showed that 11.9% of the county was classified as habitat posing at least moderate risk of human exposure to nymphs (> 6.4 nymphs per 100 m(2)). Furthermore, high-risk areas (> 10.5 nymphs per 100 m(2); 1.7% of the county) tended to cluster in the central interior and most heavily populated region of Mendocino County, but were rare in the proximity of coastal population centers. PMID:16606998

  20. A Potential Paleotsunami Shell-Hash layer from the Los Penasquitos Marsh, San Diego County, California

    NASA Astrophysics Data System (ADS)

    Rhodes, B. P.; Cordova, J.; Kirby, M. E.; Leeper, R. J.; Bonuso, N.

    2013-12-01

    The Los Penasquitos Marsh is one of a series of coastal wetlands between San Diego and Orange County that formed within stream valleys that were flooded and filled with sediment during early Holocene sea-level rise. In order to test the hypothesis that these wetlands contain a record of prehistoric tsunamis, 21 reconnaissance gouge cores between 48 and 321 cm in length were collected and described in the field. Nearly all of the cores contained a single peaty layer in the top 20-40 cm, underlain by interbedded fine-medium gray sand and mud. The stratigraphy in the cores is generally consistent with the complete infilling of a lagoon behind a baymouth bar during the mid-late Holocene. Five of the cores, ranging from 1.0-1.4 km inland from the present beach, intersect a distinctive 0.5 - 12.0 cm-thick shell-hash layer at a depth of between 233 and 280 cm beneath the modern surface. Based on this discovery, we collected a 285 cm long 5-cm diameter core using a Livingstone Piston corer. In this core the 10 cm-thick shell hash layer consists of angular fragments up to 1 cm of broken shells in a coarse sandy matrix that include the following genera: Mitrella, Venus, Spirotropis, Pecten, and Nassarius. This assemblage suggests a quiet water, marine source - from the lagoon and/or offshore. The core was also analyzed for loss on ignition (LOI) at both 550° and 950°C and magnetic susceptibility (ms). The LOI550 data are unremarkable throughout the core, and the LOI950 data show an expected spike within the shell-hash layer. The ms data show very low values for the lagoonal muds and sands, but a pronounced spike within the shell hash layer. We hypothesize that the anomalously high ms value for the shell hash layer indicates a substantial component from an offshore source, where heavier magnetic minerals may have accumulated seaward of the baymouth bar. If correct, this layer may represent a large-wave event, either a storm or tsunami. Three C-14 dates (uncorrected for the