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1

Relative Tsunami Hazard Maps, Humboldt County, California  

Microsoft Academic Search

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

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

2003-01-01

2

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

3

Relative Tsunami Hazard Maps, Humboldt County, California  

NASA Astrophysics Data System (ADS)

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.

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

2003-12-01

4

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

NASA Astrophysics Data System (ADS)

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 awareness of earthquake and tsunami hazards in the county and additional surveys have tracked public awareness and tourist concerns about tsunami hazard signs. Over the thirteen 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 from 51 to 73 percent and knowing what the Cascadia subduction zone is from 16 to 42 percent.

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

2008-12-01

5

SCORE Science: Humboldt County Office of Education  

NSDL National Science Digital Library

SCORE, a cooperative project of the California County Superintendent's Educational Services Association, has made K-12 teacher and student resources in four major subject areas available at sites in Humboldt County (Science), San Diego County (Language Arts), Kings County (Mathematics), and San Bernardino and Butte Counties (Social Studies). While each site has its own personality and delivery style, they all make an attempt to break out teacher and/or student resources by grade level. In some cases (Science, Social Studies) this is done through a search interface. In others (Language Arts, Mathematics) it is done via a browsable interface. It is this categorization, plus the fact that resources are selected, evaluated, and annotated by teachers, that is the both the power and unifying theme of the sites. Depending on the site, assessment and teacher development sections may also be available.

1996-01-01

6

Meteorological, water-temperature, and discharge data for the Mattole River basin, Humboldt County, California  

USGS Publications Warehouse

To overcome a major difficulty in the testing of the validity of river-temperature models - the lack of adequate precise synoptic data for an entire river basin - synoptic meteorologic, water-temperature, and discharge data were obtained in the Mattole River Basin in northern California during the period June 10 through August 31, 1975. The variables monitored were water temperature in the main channel and major tributaries, wind velocity, wet-bulb and dry-bulb air temperature, total hemispherical incoming radiation, total incoming shortwave radiation, discharge in the main channel and major tributaries, and average velocity and axial dispersion coefficients in the main channel. This report describes the experimental design and the instrumentation and procedures followed to insure the best possible information, and it presents a detailed set of data which can be used in testing river-temperature models. (USGS)

Noble, R. D.; Jackman, Alan P.

1983-01-01

7

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

USGS Publications Warehouse

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)

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

1976-01-01

8

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

9

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

10

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

11

Virgin Valley opal district, Humboldt County, Nevada  

USGS Publications Warehouse

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.

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

1951-01-01

12

North Coast Journal | Humboldt County, California Marketplace  

E-print Network

up, spewing out ... fire, hot coals and sparks ... the body of the moon which was below writhed the crater, formed of light-colored ejecta material, are pristine, while those from older craters have been

Withers, Paul

13

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

SciTech Connect

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 fineto medium-grained felsic to intermediate dikes. Widespread open fractures and extensive of quartz veining in many intervals of the core indicate a high degree of fracturing and flow of silica-bearing fluids, almost certainly hotter than 200°C (392°F), at some time, but these fractures are now partially sealed. Intervals of soft shaly mudstone, common clay gouge, and rocks with generally low permeability (few veins and fractures) may also form a seal or ‘cap’ above the main high temperature reservoir at Blue Mountain. The encouraging results from Deep Blue No.2 support further drilling at Blue Mountain. Higher temperature fluids can be expected where fractures providing channels for the circulation of hot water from depth have not been sealed extensively by silica deposition.

Ted Fitzpatrick, Brian D. Fairbank

2005-04-01

14

DIURNAL AND NOCTURNAL ROOST SITE FIDELITY OF DUNLIN (CALIDRIS ALPINA PACIFICA) AT HUMBOLDT BAY, CALIFORNIA  

E-print Network

of the ecol- ogy of animals as diverse as birds, butterflies, bats, and pinnipeds. Roosts are often described677 DIURNAL AND NOCTURNAL ROOST SITE FIDELITY OF DUNLIN (CALIDRIS ALPINA PACIFICA) AT HUMBOLDT BAY, California 95521, USA Abstract.-- Shorebird roosts are often considered traditional, on the basis of pre

Colwell, Mark

15

DIURNAL AND NOCTURNAL ROOST SITE FIDELITY OF DUNLIN (CALIDRIS ALPINA PACIFICA) AT HUMBOLDT BAY, CALIFORNIA  

E-print Network

as diverse as birds, butterflies, bats, and pinnipeds. Roosts are often described as "traditional" because11 DIURNAL AND NOCTURNAL ROOST SITE FIDELITY OF DUNLIN (CALIDRIS ALPINA PACIFICA) AT HUMBOLDT BAY, California 95521, USA A s ra .-- Shorebird roosts are often considered traditional, on the basis of pre

Colwell, Mark

16

Interannual variability in chlorophyll concentrations in the Humboldt and California Current Systems  

E-print Network

Interannual variability in chlorophyll concentrations in the Humboldt and California CurrentWiFS data provide the first systematic comparison of 10 years (1997­2007) of chlorophyll interannual occur in austral summers of 2002­2003, 2003­2004. Relationships of chlorophyll anomalies to forcing

Thomas, Andrew

17

Trace fossils and environments of deposition, Humboldt Basin, California  

E-print Network

of in- terbedded sandstone and mudstone in Lower and Middle Rio Dell Memb rs of the Centerville Coastal section. 12 Typical turbiditic sandstone with associated trace fossils in lower Eel River Formation at Centerville Beach . 60 13 Turbiditic... proposed the term "llildcat Series" for outcrops exposed in the Humboldt area. Strata in the area have since been subdivided into the Pullen, Eel River, Rio Dell, Scotia Bluffs, and Carlotta Formations, in ascending order. A wide range of depositional...

Jennings, Robert Harold

2012-06-07

18

Environmental Monitoring of the 1986 Apple Maggot Eradication Project in Humboldt and Del Norte Counties.  

National Technical Information Service (NTIS)

The 1986 Apple Maggot Eradication Project required use of the insecticide phosmet over large areas in six counties of northern California. The chemical had no previous use on eradication projects in California, was not registered for use on crabapples and...

D. A. Gonzales, D. Supkoff, J. Fleck, S. Margetich, J. Echelberry

1987-01-01

19

Mapping salt marsh vegetation using aerial hyperspectral imagery and linear unmixing in Humboldt Bay, California  

Microsoft Academic Search

Composition of salt marsh vegetation is important to wetland ecosystem health, and monitoring invasive species is critical.\\u000a The purpose of this study was to examine the utility of airborne hyperspectral imagery in mapping salt marsh vegetation in\\u000a Humboldt Bay, California, USA. An unmixing algorithm was applied to spatial and spectral image subsets. Overall accuracy among\\u000a Spartina densiflora, Salicornia virginica, and

Chaeli Judd; Steven Steinberg; Frank Shaughnessy; Greg Crawford

2007-01-01

20

Observed and modeled tsunami current velocities in Humboldt Bay and Crescent City Harbor, northern California  

NASA Astrophysics Data System (ADS)

A pilot project was initiated in 2009 in Humboldt Bay, about 370 kilometers (km) north of San Francisco, California, to measure the currents produced by tsunamis. Northern California is susceptible to both near- and far-field tsunamis and has a historic record of damaging events. Crescent City Harbor, located approximately 100 km north of Humboldt Bay, suffered US 20 million in damages from strong currents produced by the 2006 Kuril Islands tsunami and an additional US 20 million from the 2011 Japan tsunami. In order to better evaluate these currents in northern California, we deployed a Nortek Aquadopp 600kHz 2D Acoustic Doppler Current Profiler (ADCP) with a one-minute sampling interval in Humboldt Bay, near the existing National Oceanic and Atmospheric Administration (NOAA) National Ocean Service (NOS) tide gauge station. The instrument recorded the tsunamis produced by the Mw 8.8 Chile earthquake on February 27, 2010 and the Mw 9.0 Japan earthquake on March 11, 2011. Currents from the 2010 tsunami persisted in Humboldt Bay for at least 30 hours with peak amplitudes of about 0.3 meters per second (m/s). The 2011 tsunami signal lasted for over 86 hours with peak amplitude of 0.95 m/s. Strongest currents corresponded to the maximum change in water level as recorded on the NOAA NOS tide gauge, and occurred 90 minutes after the initial wave arrival. No damage was observed in Humboldt Bay for either event. In Crescent City, currents for the first three and a half hours of the 2011 Japan tsunami were estimated using security camera video footage from the Harbor Master building across from the entrance to the small boat basin, approximately 70 meters away from the NOAA NOS tide gauge station. The largest amplitude tide gauge water-level oscillations and most of the damage occurred within this time window. The currents reached a velocity of approximately 4.5 m/s and six cycles exceeded 3 m/s during this period. Measured current velocities both in Humboldt Bay and in Crescent City were compared to calculated velocities from the Method of Splitting Tsunamis (MOST) numerical model. For Humboldt Bay, the 2010 model tsunami frequencies matched the actual values for the first two hours after the initial arrival however the amplitudes were underestimated by approximately 65%. MOST replicated the first four hours of the 2011 tsunami signal in Humboldt Bay quite well although the peak flood currents were underestimated by about 50%. MOST predicted attenuation of the signal after four hours but the actual signal persisted at a nearly constant level for more than 48 hours. In Crescent City, the model prediction of the 2011 frequency agreed quite well with the observed signal for the first two and a half hours after the initial arrival with a 50% underestimation of the peak amplitude. The results from this project demonstrate that ADCPs can effectively record tsunami currents for small to moderate events and can be used to calibrate and validate models (i.e. MOST) in order to better predict hazardous tsunami conditions and improve planned responses to protect lives and property, especially within harbors. An ADCP will be installed in Crescent City Harbor and four additional ADCPs are being deployed in Humboldt Bay during the fall of 2012.

Admire, A. R.; Dengler, L.; Crawford, G. B.; uslu, B. U.; Montoya, J.

2012-12-01

21

Fault Trace: Marin County, California  

NSDL National Science Digital Library

This photograph shows the trace of a fault (in trench phase) as it passes beneath a barn. The trace developed during the April 18, 1906 San Francisco Earthquake. The location is the Skinner Ranch, near Olema, Marin County, California.

22

Baseline socio-economic profiles of coastal counties in the northern California planning area. Final report, 1970-2020  

SciTech Connect

The report presents baseline socio-economic profiles of Del Norte, Humboldt, and Mendocino Counties in northern California. It is one of six reports prepared under the contract to develop baseline socio-economic profiles of coastal counties in California, Oregon and Washington. The profiles cover demographics, economics, housing, public services and facilities, public finance, energy consumption, land use, and port capacity, marine traffic, and fishing. Secondary sources were used to prepare the profiles. The focus of the profiles is 1980, but 1970 to 2020 is covered to the extent possible with existing data.

Brown, G.; Kolp, P.; Wallace, B.

1987-10-01

23

CONFIRMATORY SURVEY OF THE FUEL OIL TANK AREA HUMBOLDT BAY POWER PLANT EUREKA, CALIFORNIA  

SciTech Connect

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.

WADE C. ADAMS

2012-04-09

24

Geothermal study of the southwest part of the Black Rock Desert and its geothermal areas; Washoe, Pershing, and Humboldt Counties, Nevada  

Microsoft Academic Search

Several hydrothermal systems were explored in northwestern Nevada in parts of Washoe, Pershing, and Humboldt Counties. These hydrothermal systems included the Great Boiling springs and Mud springs at Gerlach, the Fly Ranch hot springs in Hualapai Flat, Double Hot and Black Rock springs at the southern end of the Black Rock Range, Trego hot spring, Soldier Meadows hot springs, and

1978-01-01

25

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...

26

Wind prospecting in San Diego County, California  

Microsoft Academic Search

This Interim Report summarizes the site selection and first six months of data collection for a wind prospecting study which Meteorological Research, Inc., conducted in San Diego County, California. Existing wind data were compiled and analyzed in order to identify areas with potential for wind energy development. Thirty sites were assessed for land use and environmental restraints. Of these 30,

R. S. Anderson; R. A. Murphy

1983-01-01

27

California County Data Book 1995.  

ERIC Educational Resources Information Center

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)…

Children Now, Oakland, CA.

28

RIVER OTTER MONITORING BY CITIZEN SCIENCE VOLUNTEERS IN NORTHERN CALIFORNIA: SOCIAL GROUPS AND LITTER SIZE  

E-print Network

@humboldt.edu ABSTRACT--Opportunistic observations of Nearctic River Otter (Lontra canadensis) were collected, Humboldt County, litters, Lontra canadensis, Nearctic River Otter, northern California, pups, social group This paper reports on the establishment of a long-term demographic study of Nearctic River Otters (Lontra

Black, Jeff

29

Geophysical investigations of the Baltazor Hot Springs known geothermal resource area and the Painted Hills thermal area, Humboldt County, Nevada  

Microsoft Academic Search

Geophysical investigations of the Baltazor Hot Springs geothermal resource area and the Painted Hills thermal area, Humboldt Co., Nevada are described. A gravity survey of 284 stations covering 750 sq km was conducted. Numerical modeling and interpretation of five detailed gravity profiles, numerical modeling and interpretation of 21.8 line km of dipole-dipole electrical resistivity data along four profiles, and a

R. K. Edquist

1981-01-01

30

University of California Agriculture and Natural Resources  

E-print Network

://anrcatalog.ucdavis.edu Publication 8426 | December 2010 Protecting Trees from Sudden Oak Death before Infection CHRIS LEE, Staff black oak trees along the California coastal region from Monterey through Humboldt Counties. Most trees can infect California bay laurel trees in advance of oak and tanoak infection and that the symptoms

California at Berkeley, University of

31

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

USGS Publications Warehouse

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

McCrory, P.A.

1995-01-01

32

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

Federal Register 2010, 2011, 2012, 2013

...Revisions to the California State Implementation...Imperial County Air Pollution Control District...Kern County Air Pollution Control District...Ventura County Air Pollution Control District...portions of the California State...

2011-07-06

33

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

Federal Register 2010, 2011, 2012, 2013

...Revisions to the California State Implementation...Imperial County Air Pollution Control District...Kern County Air Pollution Control District...Ventura County Air Pollution Control District...portions of the California State...

2011-07-06

34

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

Code of Federal Regulations, 2012 CFR

...2012-07-01 false Naval Base Ventura County, Port Hueneme, California; restricted...REGULATIONS § 334.1127 Naval Base Ventura County, Port Hueneme, California; restricted...Commanding Officer of Naval Base Ventura County. Commercial vessels that are...

2012-07-01

35

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

Code of Federal Regulations, 2011 CFR

...2011-07-01 false Naval Base Ventura County, Port Hueneme, California; restricted...REGULATIONS § 334.1127 Naval Base Ventura County, Port Hueneme, California; restricted...Commanding Officer of Naval Base Ventura County. Commercial vessels that are...

2011-07-01

36

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

Code of Federal Regulations, 2010 CFR

...2010-07-01 false Naval Base Ventura County, Port Hueneme, California; restricted...REGULATIONS § 334.1127 Naval Base Ventura County, Port Hueneme, California; restricted...Commanding Officer of Naval Base Ventura County. Commercial vessels that are...

2010-07-01

37

33 CFR 334.1126 - Naval Base Ventura County, Point Mugu, California; restricted area.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 false Naval Base Ventura County, Point Mugu, California; restricted...REGULATIONS § 334.1126 Naval Base Ventura County, Point Mugu, California; restricted...The restricted area at Naval Base Ventura County Point Mugu incorporates its shoreline...

2010-07-01

38

33 CFR 334.1126 - Naval Base Ventura County, Point Mugu, California; restricted area.  

Code of Federal Regulations, 2011 CFR

...2011-07-01 false Naval Base Ventura County, Point Mugu, California; restricted...REGULATIONS § 334.1126 Naval Base Ventura County, Point Mugu, California; restricted...The restricted area at Naval Base Ventura County Point Mugu incorporates its shoreline...

2011-07-01

39

33 CFR 334.1126 - Naval Base Ventura County, Point Mugu, California; restricted area.  

Code of Federal Regulations, 2012 CFR

...2012-07-01 false Naval Base Ventura County, Point Mugu, California; restricted...REGULATIONS § 334.1126 Naval Base Ventura County, Point Mugu, California; restricted...The restricted area at Naval Base Ventura County Point Mugu incorporates its shoreline...

2012-07-01

40

California City and County Transient Occupancy Taxes Exemption  

E-print Network

California City and County Transient Occupancy Taxes Exemption According to G-28, Section VIII business are granted an exemption from the payment of occupancy taxes imposed by these cities or counties from the tax when checking in. The traveler may be required to complete an exemption certificate

California at Berkeley, University of

41

Marine terrace deformation, san diego county, California  

USGS Publications Warehouse

The NW-SE trending southern California coastline between the Palos Verdes Peninsula and San Diego roughly parallels the southern part and off-shore extension of the dominantly right-lateral, strike-slip, Newport-Inglewood fault zone. Emergent marine terraces between Newport Bay and San Diego record general uplift and gentle warping on the northeast side of the fault zone throughout Pleistocene time. Marine terraces on Soledad Mt. and Point Loma record local differential uplift (maximum 0.17 m/ka) during middle to late Pleistocene time on the southwest side of the fault (Rose Canyon fault) near San Diego. The broad Linda Vista Mesa (elev. 70-120 m) in the central part of coastal San Diego County, previously thought to be a single, relatively undeformed marine terrace of Plio-Pleistocene age, is a series of marine terraces and associated beach ridges most likely formed during sea-level highstands throughout Pleistocene time. The elevations of the terraces in this sequence gradually increase northwestward to the vicinity of San Onofre, indicating minor differential uplift along the central and northern San Diego coast during Pleistocene time. The highest, oldest terraces in the sequence are obliterated by erosional dissection to the northwest where uplift is greatest. Broad, closely spaced (vertically) terraces with extensive beach ridges were the dominant Pleistocene coastal landforms in central San Diego County where the coastal slope is less than 1% and uplift is lowest. The beach ridges die out to the northwest as the broad low terraces grade laterally into narrower, higher, and more widely spaced (vertically) terraces on the high bluffs above San Onofre where the coastal slope is 20-30% and uplift is greatest. At San Onofre the terraces slope progressively more steeply toward the ocean with increasing elevation, indicating continuous southwest tilt accompanying uplift from middle to late Pleistocene time. This southwest tilt is also recorded in the asymmetrical valleys of major local streams where strath terraces occur only on the northeast side of NW-SE-trending valley segments. The deformational pattern (progressively greater uplift to the northwest with slight southwest tilt) recorded in the marine and strath terraces of central and northern coastal San Diego County conforms well with the historic pattern derived by others from geodetic data. It is not known how much of the Santa Ana structural block (between the Newport-Inglewood and the Elsinore fault zones) is affected by this deformational pattern. ?? 1979.

McCrory, P. A.; Lajoie, K. R.

1979-01-01

42

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

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).

W.C. Adams

2011-04-01

43

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

ERIC Educational Resources Information Center

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)…

California Child Care Resource and Referral Network, San Francisco.

44

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

USGS Publications Warehouse

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.

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

1983-01-01

45

Prevalence of pathogenic enteric bacteria in wild birds associated with agriculture in Humboldt County, California.  

E-print Network

??Cloacal and fecal samples of 243 wild birds, including 65 house sparrows (Passer domesticus), 29 white-crowned sparrows (Zonotrichia leucophrys), 16 Brewer’s blackbirds (Euphagus cyanocephalus), 43… (more)

Rogers, Krysta H.

2006-01-01

46

78 FR 922 - Revisions to the California State Implementation Plan, Imperial County Air Pollution Control...  

Federal Register 2010, 2011, 2012, 2013

...FRL-9766-5] Revisions to the California State Implementation Plan, Imperial County Air Pollution Control District AGENCY...to the Imperial County Air Pollution Control District (ICAPCD) portion of the California Implementation...

2013-01-07

47

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

Federal Register 2010, 2011, 2012, 2013

...FRL-9842-4] Revisions to the California State Implementation Plan, Placer County Air Pollution Control District AGENCY...revisions to the Placer County Air Pollution Control District (PCAPCD) portion of the California State Implementation...

2013-08-29

48

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

Federal Register 2010, 2011, 2012, 2013

...FRL-9152-9] Revisions to the California State Implementation Plan; Imperial County Air Pollution Control District AGENCY...to the Imperial County Air Pollution Control District (ICAPCD) portion of the California State Implementation...

2010-05-19

49

78 FR 896 - Revisions to the California State Implementation Plan, Imperial County Air Pollution Control...  

Federal Register 2010, 2011, 2012, 2013

...FRL-9730-4] Revisions to the California State Implementation Plan, Imperial County Air Pollution Control District AGENCY...to the Imperial County Air Pollution Control District (ICAPCD) portion of the California State Implementation...

2013-01-07

50

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

Federal Register 2010, 2011, 2012, 2013

...Revisions to the California State Implementation...Placer County Air Pollution Control District...Placer County Air Pollution Control District...portion of the California State Implementation...Subpart F--California 0 2. Section...Placer County Air Pollution Control...

2012-01-19

51

Composition and Distribution of Beach Debris in Orange County, California  

Microsoft Academic Search

Many studies have quantified debris collected on beaches around the world. Only a few of those studies have been conducted in the United States, and they are largely limited to semi-quantitative efforts performed as part of volunteer clean-up activities. This study quantifies the distribution and composition of beach debris by sampling 43 stratified random sites on the Orange County, California

Shelly L. Moore; Dominic Gregorio; Michael Carreon; Stephen B. Weisberg; Molly K. Leecaster

2001-01-01

52

Heat flow in the Coso geothermal area, Inyo County, California  

Microsoft Academic Search

Obvious surface manifestations of an anomalous concentration of geothermal resources at the Coso geothermal area, Inyo County, California, include fumarolic activity and associated hydrothermally altered rocks. Pleistocene volcanic rocks associated with the geothermal activity include 38 rhyolite domes occupying a north trending structural and topographic ridge and numerous basaltic cinder cones and lava flows partly surrounding its southern half. In

Jim Combs

1980-01-01

53

Diet and colon cancer in Los Angeles County, California  

Microsoft Academic Search

The diets of 746 colon cancer cases in Los Angeles County, California (USA) were compared with those of 746 controls matched on age, sex, race, and neighborhood. In both genders, total energy intake was associated with significantly increased risk, and calcium intake was associated with significantly decreased risk. These effects were reduced only slightly after adjustment for the nondietary risk

Ruth K. Peters; Malcolm C. Pike; David Garabrant; Thomas M. Mack

1992-01-01

54

America's Job Center of California Formerly "California One-Stop Career Centers" Sorted by County and City  

E-print Network

America's Job Center of California Formerly "California One-Stop Career Centers" Sorted by County and City As of July 1, 2014, this listing of the America's Job Center of California (AJCC) will no longer be available. To locate an AJCC office near you, use the EDD Office Locator. #12;Alameda County America's Job

55

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)

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.

Kraushaar, Sabina M.

56

Outdoor residential water use trends in Orange County, California  

NASA Astrophysics Data System (ADS)

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 policies and educational programs.

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

2012-12-01

57

Graphite deposits in Siskiyou County, California  

USGS Publications Warehouse

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.

Rynearson, Garn A.

1945-01-01

58

The Santa Cruz County Chapter of the California Native Plant Society  

E-print Network

The Santa Cruz County Chapter of the California Native Plant Society is proud to announce the publication of the Annotated Checklist of the Vascular Plants of Santa Cruz County, California by Dylan the latest information on the 1594 vascular plant taxa currently known to occur in Santa Cruz County

California at Santa Cruz, University of

59

HIV Services Utilization in Los Angeles County, California  

Microsoft Academic Search

Recipients of HIV\\/AIDS prevention services in Los Angeles County California were surveyed in 2004 by 220 HIV prevention service\\u000a provider staff from 51 agencies funded by the Office of AIDS Programs and Policy. This resulted in 2,102 usable surveys for\\u000a cluster analysis purposes. This Countywide Risk Assessment Survey assessed demographics, sexual history, substance use, perceptions\\u000a regarding HIV\\/AIDS, and use of

Dennis G. Fisher; David Wishart; Grace L. Reynolds; Jordan W. Edwards; Lee M. Kochems; Michael A. Janson

2010-01-01

60

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

USGS Publications Warehouse

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.

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

1984-01-01

61

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

PubMed

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

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

62

78 FR 21581 - Revisions to the California State Implementation Plan, Santa Barbara County Air Pollution Control...  

Federal Register 2010, 2011, 2012, 2013

...FRL-9776-5] Revisions to the California State Implementation Plan, Santa Barbara County Air Pollution Control District and South Coast...SUMMARY: EPA is proposing to approve revisions to the Santa Barbara County Air Pollution Control District (SBCAPCD)...

2013-04-11

63

78 FR 23677 - Revisions to the California State Implementation Plan, Imperial County Air Pollution Control...  

Federal Register 2010, 2011, 2012, 2013

...Implementation Plan, Imperial County Air Pollution Control District AGENCY: Environmental...revisions to the Imperial County Air Pollution Control District (ICAPCD) portion...California including San Joaquin Valley Air Pollution Control District...

2013-04-22

64

78 FR 12267 - Revision of Air Quality Implementation Plan; California; Placer County Air Pollution Control...  

Federal Register 2010, 2011, 2012, 2013

...Plan; California; Placer County Air Pollution Control District and Feather River...revision to the Placer County Air Pollution Control District (PCAPCD) and...modification of stationary sources of air pollution within each District. EPA...

2013-02-22

65

78 FR 58460 - Revision of Air Quality Implementation Plan; California; Placer County Air Pollution Control...  

Federal Register 2010, 2011, 2012, 2013

...Plan; California; Placer County Air Pollution Control District and Feather River...revision to the Placer County Air Pollution Control District (PCAPCD) and...modification of stationary sources of air pollution within each District. We...

2013-09-24

66

Geology of Superior Ridge uranium deposits, Ventura County, California  

SciTech Connect

Epigenetic uranium deposits with potential commercial value have been found in the lower part of the upper Eocene to lower Miocene Sespe Formation near Ojai, in Ventura County, California. This report describes the geological and geochemical setting of these deposits and postulates a model for their origin. Several uranium deposits are located on Superior Ridge, a topographic high about 3 miles long located just south of White Ledge Peak and 6 to 9 miles west of Ojai (Photo 1). A single uranium deposit on Laguna Ridge is located about 3 miles south of Superior Ridge, and was included with the Superior Ridge deposits in the White Ledge Peak district. A few small deposits are known to exist in other parts of Ventura County. A preliminary model for uranium mineralization in the Sespe Formation postulated that the organic material necessary for concentrating the uranium by chemical reduction or precipitation originated as terrestrial humic acid or humate.

Dickinson, K.A.; Leventhal, J.S.

1988-03-01

67

Uninsured working immigrants: a view from a California county.  

PubMed

We inform a county's efforts to provide health insurance to uninsured working immigrants-a group left out of national and state strategies that aim to expand coverage. We analyzed a population-based survey data administered in English, Spanish, Cantonese, Mandarin, Korean, Vietnamese, and Dari on 5,540 nonelderly adult workers in Alameda County, California. The study models the likelihood of employment-based coverage, estimates the eligibility for public programs, and evaluates the affordability of average employee share of premiums by citizenship status and years lived in the United States (tenure). Immigrant workers in Alameda County are disproportionately uninsured. They constitute 29% of the employee labor force but 54% of uninsured employees. Employment-based coverage increased with citizenship and length of stay (tenure) in the United States. Noncitizens with less than 5 years residency in the United States faced the greatest disadvantage in securing employment-based coverage, an effect that is greater than disadvantages associated with race/ethnicity. A citizenship-tenure divide existed in obtaining employment-based coverage, suggesting that policies focusing on noncitizen and new immigrant workers would greatly relieve the disparate uninsured rates among workers. The expansion of nonemployment-based coverage programs would cover more than 30% of Alameda County's uninsured immigrant workers; but subsidies will also be needed for the lowest-income workers who are not eligible for these programs. PMID:15744477

Ponce, Ninez; Nordyke, Robert J; Hirota, Sherry

2005-01-01

68

Climate controls on valley fever incidence in Kern County, California  

NASA Astrophysics Data System (ADS)

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.

Zender, Charles S.; Talamantes, Jorge

2006-01-01

69

Development of An Integrated Hydrologic Model in Yolo County, California  

NASA Astrophysics Data System (ADS)

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 (1970-2000) groundwater level records at 105 monitoring wells, and three streamflow gages along Cache Creek. Calibration results show that the YCIGSM is able to reasonably simulate the long-term groundwater level trends and short-term seasonal fluctuations. The YCIGSM will be used to develop operational guidelines to manage the groundwater basin, to determine the optimum yield of water projects, to identify benefits and impacts of projects on existing groundwater users, and to assess the environmental benefits and impacts during the development of projects, as well as during the environmental permitting process.

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

2006-12-01

70

EPIZOOTIOLOGICAL FEATURES OF AVIAN CHOLERA ON THE NORTH COAST OF CALIFORNIA  

Microsoft Academic Search

An avian cholera (Pasteurella multocida) epizootic was observed among wildfowl at the Centerville Gun Club, Humboldt County, California (USA) in January 1978. Compared to their live populations and use of the area, coots (Fulica americana) died in proportionately greater numbers than any other species. Coots collected by gunshot were evaluated for sex and age composition, and morphometry from November 1977

JGregory Mensik; Richard G. Botzler

71

Using a GIS to Model Tsunami Evacuation Times for the Community of Fairhaven, California  

Microsoft Academic Search

The community of Fairhaven (pop. 200) is located at the southern end of the Samoa Peninsula in Humboldt County, California. Fairhaven experienced minor flooding from the 1964 Alaska teletsunami and lies within the inundation zone of numerical models for tsunamis generated by the Cascadia s¬ubduction zone. The highest elevations in the community are about 8 meters which potentially exposes the

N. Graehl; L. Dengler

2008-01-01

72

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

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…

Pine, Amy

73

76 FR 12280 - Revisions to the California State Implementation Plan, for Imperial County, Kern County, and...  

Federal Register 2010, 2011, 2012, 2013

...County, and Ventura County; Air Pollution Control Districts AGENCY: Environmental...revisions to the Imperial County Air Pollution Control District (ICAPCD), Kern County Air Pollution Control District...

2011-03-07

74

76 FR 12306 - Revisions to the California State Implementation Plan, Imperial County, Kern County, and Ventura...  

Federal Register 2010, 2011, 2012, 2013

...County, and Ventura County; Air Pollution Control Districts AGENCY: Environmental...revisions to the Imperial County Air Pollution Control District (ICAPCD), Kern County Air Pollution Control District...

2011-03-07

75

Economic Impact of Low Income Health Program Spending on Select California Counties by Laurel Lucia  

E-print Network

1 Economic Impact of Low Income Health Program Spending on Select California Counties by Laurel Demonstration Waiver which includes the Low Income Health Program (LIHP). County-based LIHPs will offer comprehensive benefits to low-income adults who are currently ineligible for Medi-Cal coverage. County spending

Militzer, Burkhard

76

Natural egg mass deposition by the Humboldt squid (Dosidicus gigas) in the Gulf of California and characteristics of hatchlings and paralarvae  

Microsoft Academic Search

The jumbo or Humboldt squid, Dosidicus gigas, is an important fisheries resource and a significant participant in regional ecologies as both predator and prey. It is the largest species in the oceanic squid family Ommastrephidae and has the largest known potential fecundity of any cephalopod, yet little is understood about its reproductive biology. We report the first dis- covery of

B. C. S. Mexico

2008-01-01

77

Humboldt digital library and interconnectedness  

E-print Network

The Humboldt digital library (HDL) represents an innovative system to access the works and legacy of Alexander von Humboldt in a digital form on the Internet (www.avhumboldt.net). It contributes to the key question about how to present...

Doherr, Detlev; Baron, Frank

2012-01-01

78

Humboldt River main stem, Nevada  

USGS Publications Warehouse

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.

Warmath, Eric; Medina, Rose L.

2001-01-01

79

77 FR 73005 - Revisions to the California State Implementation Plan, Imperial County, Placer County, and...  

Federal Register 2010, 2011, 2012, 2013

...Placer County, and Ventura County Air Pollution Control Districts AGENCY: Environmental...revisions to the Imperial County Air Pollution Control District (ICAPCD), Placer County Air Pollution Control District (PCAPCD)...

2012-12-07

80

77 FR 72968 - Revisions to the California State Implementation Plan, for Imperial County, Placer County and...  

Federal Register 2010, 2011, 2012, 2013

...Placer County and Ventura County Air Pollution Control Districts AGENCY: Environmental...revisions to the Imperial County Air Pollution Control District (ICAPCD), Placer County Air Pollution Control District (PCAPCD)...

2012-12-07

81

Whose vision? Conspiracy theory and land-use planning in Nevada County, California  

Microsoft Academic Search

In this paper we examine the role of claims of global conspiracy in undermining a local environmental planning process known as Natural Heritage 2020 (NH 2020) in Nevada County, California. County officials intended NH 2020 to mitigate the environmental impacts of rapid growth in this gentrifying rural community. This program illustrates the increasing use by land-use planners of landscape-scale approaches

Patrick T Hurley; Peter A Walker

2004-01-01

82

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

SciTech Connect

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.

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

1987-05-01

83

78 FR 21580 - Revisions to the California State Implementation Plan, Santa Barbara and San Diego County Air...  

Federal Register 2010, 2011, 2012, 2013

...FRL-9794-3] Revisions to the California State Implementation Plan, Santa Barbara and San Diego County Air Pollution Control Districts...SUMMARY: EPA is proposing to approve revisions to the Santa Barbara County Air Pollution Control District (SBCAPCD)...

2013-04-11

84

Humboldt National Forest East Mormon  

E-print Network

North East Mormon Mountain Gold Point Amargosa Valley 375 215 215 146 168 160 215 146 375 601 215 127 Vegas Blue Diamond Paradise Trona Spring Valley Searles Valley Tonopah Chloride Searchlight Shoshone-Sha Shoshone Band of California Moapa River Reservation Las Vegas Colony 93 6 95 95 6 93 93 State Line County

Laughlin, Robert B.

85

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

USGS Publications Warehouse

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)

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

1986-01-01

86

The first occurrence of the neurotoxin domoic acid (DA) in Humboldt squid (Dosidicus gigas) during a toxic  

E-print Network

ABSTRACT The first occurrence of the neurotoxin domoic acid (DA) in Humboldt squid (Dosidicus gigas in pelagic ecosystems influenced by the California Current System. INTRODUCTION The Humboldt squid Dosidicus gigas is a large nerito- oceanic squid and an important link between lower trophic levels and apex

87

A Tale of Two Counties: Expanding Health Insurance Coverage for Children in California  

PubMed Central

During difficult economic times, many California counties have expanded health insurance coverage for low-income children. These Children's Health Initiatives (CHIs) enroll children in public programs and provide new health insurance, Healthy Kids, for those ineligible for existing programs. This article describes the policy issues in implementing the Santa Clara and San Mateo County CHIs, as well as the children's enrollment levels and utilization of services. These CHIs are among the first of the thirty California counties planning or implementing such initiatives. Their success depends on leadership from county agencies that have not traditionally worked closely together, as well as the development of a diverse public and private funding base. This effort to provide universal coverage for all children is important to national policymakers desiring similar goals. PMID:16953809

Howell, Embry M; Hughes, Dana

2006-01-01

88

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

USGS Publications Warehouse

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.

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

2013-01-01

89

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

NASA Astrophysics Data System (ADS)

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.

Beall, R.

2012-12-01

90

HANTAVIRUS(BUNYAVIRIDAE) INFECTIONS IN RODENTS FROM ORANGE AND SAN DIEGO COUNTIES, CALIFORNIA  

Microsoft Academic Search

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

STEPHEN G. BENNETT; JAMES P. WEBB; MINOO B. MADON; JAMES E. CHILDS; THOMAS G. KSIAZEK; NORAH TORREZ-MARTINEZ; BRIAN HJELLE

91

Estimation of the Fire Interval Distribution for Los Angeles County, California  

E-print Network

Estimation of the Fire Interval Distribution for Los Angeles County, California Roger D. Peng interval distribution. Key words: Coverage process data; Time-since-fire distribution; Wildfire risk; Local covariates including wind, precipitation, fuel moisture, temperature, topography, and many others (see e

Schoenberg, Frederic Paik (Rick)

92

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

ERIC Educational Resources Information Center

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…

METZLER, WILLIAM H.

93

NEST BOX USE AND REPRODUCTIVE BIOLOGY OF THE AMERICAN KESTREL IN LASSEN COUNTY, CALIFORNIA  

Microsoft Academic Search

During 1976 we implemented an American Kestrel (Falco sparverius) nest box program in the Great Basin of Lassen County, California. The primary goal was the creation of nesting habitat where no habitat existed, and the reestablishment of such habitat where it had been eliminated. Of 247 functional nest boxes examined between 1977 and 1980, 31% of these were active and

Peter H. Bloom; Stephen J. Hawks

94

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...

95

A geophysical study of the hydrogeology of the Carrizo plain area, San Luis Obispo County, California  

Microsoft Academic Search

This investigation was conducted to attempt to locate structural geologic features and variations in aquifer characteristics in an area within the Carrizo plain, San Luis Obispo County, California. The investigation included a review of the established geologic knowledge for the region, followed by field studies. The field studies included surface magnetometer surveys, thermal borehole logging, and a piezometric level survey.

1991-01-01

96

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

SciTech Connect

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.

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

1980-09-01

97

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

ERIC Educational Resources Information Center

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…

Folkman, William S.; Taylor, Jean

98

California's County and City Environmental Health Services Delivery System  

E-print Network

School of Public Health Office of Public Health Practice & Workforce Development Primary Authors Paola.S. Centers for Disease Control & Prevention National Center for Environmental Health California Conference Bloomberg School of Public Health by grant #U50/CCU924359- 01 from the U.S. Centers for Disease Control

99

The January 1977 avian cholera epornitic in northwest California.  

PubMed

A total of 844 birds were observed dead at three sites in Humboldt County and an estimated 6750 birds died at three sites in Del Norte County, California. Coots were the primary species affected. The isolation of Pasteurella multocida from a snowy egret (Egretta thula) is the first reported case of avian cholera in this bird. There was evidence for a distinct sequence in the bird species dying at one site; American coots (Fulica americana) appeared to be the first species to die. PMID:691123

Oddo, A F; Pagan, R D; Worden, L; Botzler, R G

1978-07-01

100

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

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…

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

101

Reconnaissance of geothermal resources of Los Angeles County, California  

SciTech Connect

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.

Higgins, C.T.

1981-01-01

102

Sedimentation of Williams Reservoir, Santa Clara County, California  

USGS Publications Warehouse

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.

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

1972-01-01

103

Ambient Air Pollution and Autism in Los Angeles County, California  

PubMed Central

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-?g/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

Becerra, Tracy Ann; Wilhelm, Michelle; Olsen, J?rn; Cockburn, Myles

2012-01-01

104

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

USGS Publications Warehouse

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.

Creasey, S. C.

1946-01-01

105

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

PubMed Central

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

Johnson, Karen L.; Weng, Hsin-Yi

2013-01-01

106

Geohydrology of the Escondido hydrologic subarea, San Diego County, California  

USGS Publications Warehouse

The San Diego region of California is undergoing rapid growth with a corresponding increase in the demand for water. To update the basin plan developed in 1975 by the California Regional Water Quality Control Board, San Diego Region, water-level and water quality data for the 44-sq mi Escondido hydrologic subarea were collected and analyzed. Water-level measurements indicate that groundwater in most of the subarea was within 20 ft of land surface. Groundwater generally moves from the weathered crystalline rocks on hillsides into the alluvium. Groundwater moves from north to south in Reidy Canyon and from east to west in the alluvium along Escondido Creek. Water from all 20 wells sampled in 1987 had dissolved-solids concentrations greater than the U.S. Environmental Protection Agency recommended limit of 500 mg/L; concentrations ranged from 720 to 4,500 mg/L. Nitrate (as nitrogen) concentrations ranged from 1.1 to 86 mg/L. Water from 14 of the 20 wells had nitrate (as nitrogen) concentrations greater than the U.S. Environmental Agency recommended limit of 10 mg/L. (USGS)

Woolfenden, L. R.

1989-01-01

107

In 2005, an outbreak of West Nile virus (WNV) disease occurred in Sacramento County, California; 163 human cas-  

E-print Network

the economic impact of the outbreak, including the vector control event and the medical cost to treat WNVIn 2005, an outbreak of West Nile virus (WNV) disease occurred in Sacramento County, California disease. WNV disease in Sacramento County cost $2.28 million for medical treatment and patients' pro

Peterson, Robert K. D.

108

Epidemiologic investigation of the relationship between DBCP contamination in drinking water and birth rates in Fresno County, California  

Microsoft Academic Search

This report describes an epidemiologic investigation of the relationship between DBCP (dibromochloropropane) contamination in drinking water and birth rates between 1978 and 1982 in Fresno County, California. Census tracts in the county were categorized according to DBCP level in their drinking water. Standardized birth ratios and relative birth ratios (adjusted for age, race, per cent Hispanic, and parity) were calculated

O. Wong; M. D. Whorton; N. Gordon; R. W. Morgan

1988-01-01

109

Congenital cardiac anomalies in relation to water contamination, Santa Clara County, California, 1981-1983.  

PubMed

In November 1981, a leak of solvents from an underground storage tank was detected at an electronics manufacturing plant in Santa Clara County, California. Solvents (predominantly 1,1,1-trichloroethene, or methyl chloroform) were found in a nearby well which supplied drinking water to the surrounding community. Residents were concerned about a possible relation between adverse reproductive outcomes and consumption of contaminated water. To address this concern, the California Department of Health Services conducted two epidemiologic studies: one of these, reported here, is a county-wide study of cardiac anomalies. This study, which looked at major cardiac anomalies among births throughout Santa Clara County in 1981-1983, found an increased prevalence in the service area of the water company which operated the contaminated well. During the potentially exposed time period (January 1981 through August 1982), 12 babies with major cardiac anomalies were born to residents of this area. This represents an excess of six cases over the number expected based on the prevalence in the remainder of the county (relative risk = 2.2, 95 per cent confidence interval 1.2-4.0). No excess was observed in the unexposed time period (September 1982 through December 1983). However, the temporal distribution of major cardiac cases born during the exposed time period suggests that the solvent leak is an unlikely explanation for this excess. PMID:2784935

Swan, S H; Shaw, G; Harris, J A; Neutra, R R

1989-05-01

110

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

SciTech Connect

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.

Bender-Lamb, S.

1991-04-01

111

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

SciTech Connect

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.

Czarnecki, J.B.

1997-12-31

112

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

SciTech Connect

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.

NONE

1990-12-01

113

Humboldt State University Fisheries Biology  

NSDL National Science Digital Library

The Fisheries Science Department of Humboldt State University offers an interdisciplinary Bachelor of Sciences degree in Aquarium Sciences. To prepare for a career as a professional aquarist or aquarium curator, training includes: husbandry, culture of aquatic organisms, ichthyology, pathology, life support, exhibit design, conservation, business management. Internships with major public aquariums are available.

2010-11-18

114

Occurrence of Pacific Fisher (Martes pennanti pacifica) in the Redwood Zone of Northern California and the Habitat Attributes Associated with their Detections  

Microsoft Academic Search

ABSTRACT I conducted sooted track plate surveys in Humboldt and Del Node Counties, California , not detect fishers. Detection ratios were compared between the 3 vegetation types that occur on the study area., Predominantly Douglas-fir (Pseudotsuga menziesii) stands had detection ratios of 0.24. 0.38, and 0.46 in 1994, 1995, and for both years combined, respe&vely. Douglas-fir and redwood (Sequoia

Richard R. Klug

1997-01-01

115

Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles County, California  

E-print Network

air pollution on preterm birth among children born in Southern Californiaair pollution and adverse birth outcomes in Los Angeles County, California,air pollution’s impact on preterm birth for women living in Southern California and

Wilhelm, Michelle; Ghosh, Jo Kay; Su, Jason; Cockburn, Myles; Jerrett, Michael; Ritz, Beate

2011-01-01

116

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

USGS Publications Warehouse

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).

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

117

Recently Exposed Fumarole Fields Near Mullet Island, Imperial County, California  

NASA Astrophysics Data System (ADS)

New field observations, lidar measurements, aerial imaging and preliminary laboratory measurements of mud samples are reported of three formerly submerged fumarole fields in the Salton Trough near Mullet Island in southeastern California, USA. The fumarole fields have recently been exposed as the Salton Sea level has dropped. The largest of the three fields visited in January 2011 is irregular in outline with a marked northeast elongation. It is roughly 400 meters long and 120 meters wide. The field consists of approximately one hundred warm to boiling hot (100° C) mud volcanoes (0.1 - 2 m in height), several hundred mud pots, and countless CO2 gas vents. Unusual shaped mud volcanoes in the form of vertical tubes with central vents were observed in many places. Lidar measurements were obtained in the time period Nov 9-13, 2010 using an Optech Orion 200M lidar from an elevation 800 m AGL. They reveal that the terrain immediately surrounding the two fields that are above water level reside on a low (~0.5 m high) gently sloping mound about 500 m across that shows no evidence of lineaments indicative of surface faulting. With other geothermal features, the fumaroles define a well-defined line marking the probable trace of the Calipatria fault. Although the precise locations is uncertain, it appears to define a straight line 4 km long between the Davis-Schrimpf mud volcanoes and Mullet Island. Mullet Island is one of five late Quaternary rhyolitic volcanic necks in the immediate area of the fumaroles. The Calipatria fault is subparallel to the San Andreas and Imperial faults and only one of many verified or suspected faults (including cross faults) in the complex tectonic setting of the Salton Trough. Mud from several volcanoes was analyzed using scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). One sample contained boussingaultite, (NH4)2Mg(SO4)2.6(H2O), a rare mineral that is known to sublime under fumarolic conditions, possibly by ammoniation of hydrated MgSO4. As the Salton Sea level continues to drop, the third fumarole field is expected to surface in the next couple of years. It is also likely that as more land emerges, many of the CO2 gas seeps currently under water will begin to for mud volcanoes and mud pots, most of them along the same NW trending axis as the others. At about the same time a land bridge will form to Mullet Island, the first in about 60 years.

Lynch, D. K.; Hudnut, K.; Adams, P.; Bernstein, L.

2011-12-01

118

Outbreak of Omite-CR-induced dermatitis among orange pickers in Tulare County, California.  

PubMed

An outbreak of dermatitis cases among 198 orange pickers employed by a Tulare County, California, packinghouse was investigated. Dermatitis was contracted by 114 (58%) of the 198 workers exposed when Omite-CR-treated fields were harvested. The dermatitis occurred predominantly in the exposed areas of the neck and chest. A dose-response association with dermatitis was suggested for Omite-CR exposure, but not for Carzol, Omite-CR + Carzol, or other pesticides. Because no violations of pesticide preharvest intervals or application rates were found, it appears that residue degradation was not given adequate consideration in the registration of Omite-CR, thus compromising the safety of the worker. PMID:2955086

Saunders, L D; Ames, R G; Knaak, J B; Jackson, R J

1987-05-01

119

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

USGS Publications Warehouse

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)

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

1985-01-01

120

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

USGS Publications Warehouse

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)

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

1990-01-01

121

Baseline socio-economic profiles of coastal counties in the southern California planning area. Final report, 1970-2020  

SciTech Connect

The report presents baseline socio-economic profiles of Los Angeles, Orange, and San Diego Counties in southern California. It is one of six reports prepared under the contract to develop baseline socio-economic profiles of coastal counties in California, Oregon, and Washington. The profiles cover demographics, economics, housing, public services and facilities, public finance, energy consumption, land use, and port capacity, marine traffic, and fishing. Secondary sources were used to prepare the profiles. The focus of the profiles is 1980, but 1970 to 2020 is covered to the extent possible with existing data.

Brown, G.; Kolp, P.; Wallace, B.

1987-10-01

122

Baseline socio-economic profiles of coastal counties in the central California planning area. Final report, 1970-2020  

SciTech Connect

The report presents baseline socio-economic profiles of Sonoma, Marin, San Francisco, San Mateo, Santa Cruz, and Monterey Counties in central California. It is one of six reports prepared under the contract to develop baseline socio-economic profiles of coastal counties in California, Oregon, and Washington. The profiles cover demographics, economics, housing public services and facilities, public finance, energy consumption, land use, and port capacity, marine traffic, and fishing. Secondary sources were used to prepare the profiles. The focus of the profiles is 1980, but 1970 to 2020 is covered to the extent possible with existing data.

Brown, G.; Kolp, P.; Wallace, B.

1987-10-01

123

Epidemiologic investigation of the relationship between DBCP contamination in drinking water and birth rates in Fresno County, California  

SciTech Connect

This report describes an epidemiologic investigation of the relationship between DBCP (dibromochloropropane) contamination in drinking water and birth rates between 1978 and 1982 in Fresno County, California. Census tracts in the county were categorized according to DBCP level in their drinking water. Standardized birth ratios and relative birth ratios (adjusted for age, race, per cent Hispanic, and parity) were calculated for these census tracts. No relation between birth ratios and DBCP contamination in drinking water was found.

Wong, O.; Whorton, M.D.; Gordon, N.; Morgan, R.W.

1988-01-01

124

Differences in reproductive risk factors for breast cancer in middle-aged women in Marin County, California and a sociodemographically similar area of Northern California  

Microsoft Academic Search

BACKGROUND: The Northern California county of Marin (MC) has historically had high breast cancer incidence rates. Because of MC's high socioeconomic status (SES) and racial homogeneity (non-Hispanic White), it has been difficult to assess whether these elevated rates result from a combination of established risk factors or other behavioral or environmental factors. This survey was designed to compare potential breast

C Suzanne Lea; Nancy P Gordon; Lee Ann Prebil; Rochelle Ereman; Connie S Uratsu; Mark Powell

2009-01-01

125

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

SciTech Connect

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.

NONE

1998-01-01

126

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

PubMed

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

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

2011-03-01

127

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

NASA Astrophysics Data System (ADS)

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.

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

2013-12-01

128

Detection of Coccidioides immitis in Kern County, California, by multiplex PCR.  

PubMed

Coccidioides immitis is a fungal human pathogen endemic to semiarid soils in southern California and Baja California (Mexico). Results of culture-dependent detection of C. immitis in the past indicated a spotty distribution and unreliable prediction of C. immitis growth sites and accumulation sites. In this project we investigated bulk soil samples for the presence of the pathogen in nonagricultural loamy soils at nine different locations around Bakersfield, Kern County, California, for almost 2 y (2008-2009). To detect the pathogen we used a multiplex PCR method with optimized soil handling and storage, DNA extraction procedure and PCR protocol. With this method we were able to detect C. immitis in 8.42% of our samples in 2008 (n = 285), mostly from early spring to early summer. In 2009 however the percentage of samples positive for C. immitis from the same sites declined to 2.68% (n = 261). We also were able to distinguish C. immitis growth sites from accumulation sites. One site close to a recreation area (Lake Webb, Buena Vista Lake Basin), not previously known to support the growth of C. immitis, was identified as a strong growth site of the fungus. The cultivation-independent method in this study together with soil parameters can be used to predict and confirm C. immitis growth sites and might be a valuable tool for public health institutions. PMID:21933931

Lauer, Antje; Baal, Joe Darryl Hugo; Baal, Jed Cyril Hugo; Verma, Mona; Chen, Jeffrey M

2012-01-01

129

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

SciTech Connect

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.

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

1980-11-10

130

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

Federal Register 2010, 2011, 2012, 2013

...Implementation Plan, Placer County Air Pollution Control District and Ventura County Air Pollution Control District AGENCY: Environmental...revisions to the Placer County Air Pollution Control District (PCAPCD)...

2011-05-24

131

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

Federal Register 2010, 2011, 2012, 2013

...Implementation Plan, Placer County Air Pollution Control District and Ventura County Air Pollution Control District AGENCY: Environmental...revisions to the Placer County Air Pollution Control District (PCAPCD)...

2011-05-24

132

Habitat selection by American martens (Martes americana) in coastal northwestern California.  

E-print Network

??The Humboldt marten, Martes americana humboldtensis, has undergone a dramatic decline throughout its historical distribution in coastal Northwestern California. There is currently only one known… (more)

Slauson, Keith M.

2003-01-01

133

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

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.

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

1980-11-10

134

Diatom biostratigraphy from dolomites in Monterey Formation, Rodeo Canyon to Point Pedernales, southwestern Santa Barbara County, California  

Microsoft Academic Search

Eight-six samples were collected from three stratigraphic sections in southwestern Santa Barbara County, California: Rodeo Canyon, Lyons Head, and Point Pedernales. In this area, the Monterey Formation is exposed in prominent cliffs along the coast from Rodeo Canyon on the south, to Lyons Head and Point Pedernales on the west. Because most of the opal-A in the Monterey diatomaceous shale

W. W. Wornardt

1986-01-01

135

The effect of selenium on reproduction of black-tailed deer (Odocoileus hemionus columbianus) in Shasta County California  

Microsoft Academic Search

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

Flueck

1989-01-01

136

Reconstructing past population processes with general equilibrium models: House mice in Kern County, California, 1926–1927  

Microsoft Academic Search

Reconstructing past ecosystem conditions is helpful in addressing a range of basic and applied questions, but difficult because of a lack of inferential or modeling approaches. Here, we demonstrate the use of a general equilibrium ecosystem model (GEEM) to investigate ecological conditions surrounding a population eruption of the house mouse (Mus musculus) in Kern County, California in the 1920s, arguably

Seong-Hee Kim; John Tschirhart; Steven W. Buskirk

2007-01-01

137

The Impact of New Health Insurance Coverage on Undocumented and Other Low-Income Children: Lessons from Three California Counties  

Microsoft Academic Search

Three California counties (Los Angeles, San Mateo, and Santa Clara) expanded health insurance coverage for undocumented children and some higher income children not covered by Medi-Cal (Medicaid) or Healthy Families (SCHIP). This paper presents findings from evaluations of all three programs. Results consistently showed that health insurance enrollment increased access to and use of medical and dental care, and reduced

MSPH Christopher Trenholm; MPA MSW Ian Hill

2010-01-01

138

The Impact of New Health Insurance Coverage on Undocumented and Other Low-Income Children: Lessons from Three California Counties  

Microsoft Academic Search

:Three California counties (Los Angeles, San Mateo, and Santa Clara) expanded health insurance coverage for undocumented children and some higher income children not covered by Medi-Cal (Medicaid) or Healthy Families (SCHIP). This paper presents findings from evaluations of all three programs. Results consistently showed that health insurance enrollment increased access to and use of medical and dental care, and reduced

Embry Howell; Christopher Trenholm; Lisa Dubay; Dana Hughes; Ian Hill

2010-01-01

139

Estimating the economic burden from illnesses associated with recreational coastal water pollution—a case study in Orange County, California  

Microsoft Academic Search

A cost-of-illness framework was applied to health and income data to quantify the health burden from illnesses associated with exposure to polluted recreational marine waters. Using data on illness severity due to exposure to polluted coastal water and estimates of mean annual salaries and medical costs (adjusted to 2001 values) for residents of Orange County, California, we estimated that the

Ryan H. Dwight; Linda M. Fernandez; Dean B. Baker; Jan C. Semenza; Betty H. Olson

2005-01-01

140

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...

141

An Assessment of Educational and Cultural Needs in Three Counties: San Benito, Santa Cruz, and Monterey, California.  

ERIC Educational Resources Information Center

Information was obtained from staffs of selected schools, from samples of eighth and twelfth grade students, and from group interviews with community representatives and school leaders for the purpose of detecting the inadequacies and shortcomings of California schools in a three-county region. Problems emerged in the areas of curriculum balance…

Bialek, Hilton M.; And Others

142

Merguerian, Charles; and Schweickert, R. A., 1980, Superposed mylonitic deformation of the Shoo Fly Complex in Tuolumne County, California.  

E-print Network

Complex in Tuolumne County, California. Mylonitic rocks of the Shoo Fly Complex underlie a 10 km wide is in thrust contact with east-dipping rocks of the Calaveras Complex. The thrust-related mylonitic structures-thrusting plutonic episode. The composite regional schistosity of the Shoo Fly Complex is folded by an E

Merguerian, Charles

143

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

ERIC Educational Resources Information Center

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…

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

2010-01-01

144

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...

145

Hydrologic data for Long Valley Caldera, Mono County, California, 1987-93  

USGS Publications Warehouse

Hydrologic data were collected during 1987-93 as part of the U.S. Geological Survey's long-term Volcanic Hazards Monitoring Program of the Long Valley Caldera, Mono County, California. The data are presented in graphs or tables. Data collected for the Long Valley Hydrologic Advisory Committee monitoring program also are presented. Hydrologic data collected include continuous record of ground-water levels in 6 wells, instantaneous measurement of ground-water levels in 55 wells, continuous record of discharge at 2 streams and 5 springs, instantaneous discharge measurements at 4 streams and 2 springs, ground-water temperature profiles of 3 thermal wells, continuous record of water temperature in 1 stream and 5 springs, vent gas temperatures at 2 fumaroles, and chemical and isotopic analyses of water samples collected at 13 ground-water and 6 surface-water sites. Precipitation amounts at three sites also are included.

Howle, J. F.; Farrar, C. D.

1996-01-01

146

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

USGS Publications Warehouse

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.

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

2007-01-01

147

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

PubMed Central

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

Fairley, D

1999-01-01

148

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

USGS Publications Warehouse

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.

Nishikawa, Tracy

2013-01-01

149

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

PubMed

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 characteristics of rodent populations infected by three hantaviruses within a small, well-defined, geographic area. PMID:9988327

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

1999-01-01

150

Globalization, Binational Communities, and Imported Food Risks: Results of an Outbreak Investigation of Lead Poisoning in Monterey County, California  

PubMed Central

Objectives. Although the burden of lead poisoning has decreased across developed countries, it remains the most prevalent environmental poison worldwide. Our objective was to investigate the sources of an outbreak of lead poisoning in Monterey County, California. Methods. An investigation in 3 county health department clinics in Monterey County, California, was conducted between 2001 and 2003 to identify risk factors for elevated blood lead levels (? 10 ?g/dL) among children and pregnant women. Results. The prevalence of elevated blood lead levels was significantly higher in 1 of the 3 clinics (6% among screened children and 13% among prenatal patients). Risk factors included eating imported foods (relative risk [RR]=3.4; 95% confidence interval [CI]=1.2, 9.5) and having originated from the Zimatlan area of Oaxaca, Mexico, compared with other areas of Oaxaca (RR=4.0; 95% CI=1.7, 9.5). Home-prepared dried grasshoppers (chapulines) sent from Oaxaca were found to contain significant amounts of lead. Conclusions. Consumption of foods imported from Oaxaca was identified as a risk factor for elevated blood lead levels in Monterey County, California. Lead-contaminated imported chapulines were identified as 1 source of lead poisoning, although other sources may also contribute to the observed findings. Food transport between binational communities presents a unique risk for the importation PMID:17395841

Handley, Margaret A.; Hall, Celeste; Sanford, Eric; Diaz, Evie; Gonzalez-Mendez, Enrique; Drace, Kaitie; Wilson, Robert; Villalobos, Mario; Croughan, Mary

2007-01-01

151

Analysis of the Criminal Jury Trial Scheduling System in Use at the Monterey Branch of the Monterey County, California Municipal Court.  

National Technical Information Service (NTIS)

This thesis is an analysis of the criminal jury trial scheduling system in use at the Monterey Branch of the Monterey County, California Municipal Court. Inefficiencies in the scheduling system which cause witnesses and jurors to incur additional costs ar...

M. J. Clark

1981-01-01

152

Ontogenetic Changes in the Foraging Behavior, Habitat Use and Food Habits of the Western Aquatic Garter Snake, 'Thamnophis couchii', at Hurdygurdy Creek, Del Norte County, California.  

National Technical Information Service (NTIS)

The author studied the foraging behaviors, stream habitat use, and food habits of a marked population of western aquatic garter snakes, Thamnophis couchii, at Hurdygurdy Creek (Del Norte County, California) during the spring and summer of 1987 and 1988. D...

A. J. Lind

1990-01-01

153

75 FR 39365 - Revisions to the California State Implementation Plan, Imperial County Air Pollution Control...  

Federal Register 2010, 2011, 2012, 2013

...Implementation Plan, Imperial County Air Pollution Control District; Final Rule Federal...Implementation Plan, Imperial County Air Pollution Control District AGENCY: Environmental...revisions to the Imperial County Air Pollution Control District (ICAPCD or the...

2010-07-08

154

78 FR 53711 - Revisions to the California State Implementation Plan, Placer, Santa Barbara and Ventura County...  

Federal Register 2010, 2011, 2012, 2013

...Santa Barbara and Ventura County Air Pollution Control Districts AGENCY: Environmental...revisions to the Placer County Air Pollution Control District (PCAPCD), Santa Barbara County Air Pollution Control District (SBCAPCD)...

2013-08-30

155

Photographs on front cover (clockwise, from upper left): (upper left) Visible mercury at contact between alluvium and slate bedrock, Sailor Flat Mine, Greenhorn Creek drainage, Nevada County, California; total length of ruler is  

E-print Network

historical gold mining, Greenhorn Creek, Nevada County, California, 1999­2001 By Charles N. Alpers, Michael P contamination and acidic drainage from historical gold mining, Greenhorn Creek, Nevada County, California, 1999 at contact between alluvium and slate bedrock, Sailor Flat Mine, Greenhorn Creek drainage, Nevada County

156

Epidemic Salmonella enteritidis infection in Los Angeles County, California. The predominance of phage type 4.  

PubMed Central

Between April and July 1994, 501 cases of Salmonella enteritidis infection were reported in Los Angeles County, California, nearly 5 times the number reported between April and July 1993; of these, 422 (84%) were sporadic (not related to known outbreaks). A case-control study was done to determine risk factors for sporadic illness; the distribution of S enteritidis phage types was evaluated. Case-patients (n = 58) were county residents older than 1 year with culture-confirmed S enteritidis infection in August 1994. One to two acquaintance controls (n = 98) were matched to each case by age, sex, and race. Two risk factors-eating raw or undercooked eggs (matched odds ratio [MOR] = 6.6; 95% confidence interval [CI] = 1.9, 23.0) and eating in restaurants (MOR = 4.9; 95% CI = 1.2, 19.4) in the 3 days before the onset of illness-remained significant in the conditional logistic regression model. Of 16 randomly selected S enteritidis case-isolates, 15 (94%) were phage type 4. The reasons for the regional predominance of phage type 4, an S enteritidis subtype recently associated with large and destructive increases in salmonellosis among poultry and humans in Britain and much of Europe, are unclear. To minimize human S enteritidis infection, food service workers need frequent training in the proper handling of raw foods, eggs should be kept refrigerated during distribution and storage, and eggs should be cooked until the yolk is firm, particularly for persons at the greatest risk for serious illness: pregnant women, elderly persons, and those with compromised immune systems. Clinicians should obtain stool specimens for culture from patients who present with diarrhea and fever or bloody diarrhea or who are possibly part of an outbreak. PMID:8909164

Passaro, D J; Reporter, R; Mascola, L; Kilman, L; Malcolm, G B; Rolka, H; Werner, S B; Vugia, D J

1996-01-01

157

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

USGS Publications Warehouse

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.

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

2007-01-01

158

ENVIRONMENTAL AUDITING: Indicators Assessment for Habitat Conservation Plan of Yolo County, California, USA.  

PubMed

/ 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. We 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. We recommend that priority be given to mitigation or conservation at the most highly rated land units. The indices were easy to measure and can be used with other tools to monitor the mitigation success. The indicators framework can be applied to other large-area planning efforts with some modifications.KEY WORDS: Ecosystem; Indicators; Landscape; Mitigation; Planning; Yolo County; California PMID:9732523

SMALLWOOD; WILCOX; LEIDY; YARRIS

1998-11-01

159

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

USGS Publications Warehouse

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.

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

1999-01-01

160

A cost-benefit analysis of a California county's back injury prevention program.  

PubMed

Back-related injuries have become a major health problem in the workplace, affecting as many as 35 percent of the work force and accounting for about 25 percent of all compensation claims. This study evaluates a back injury prevention program among employees in a northern California county in 1989-90. Six divisions of the county government were selected for the study because they had the highest prevalence of back pain experienced and the most back-related injuries in recent years. Four of the six divisions were randomly selected as the intervention group and the remaining two, the control group. Overall, 77 percent or 205 of the targeted employees in the intervention group participated in the study. The intervention group was given an identical health risk assessment (HRA) before and after the 1-year back injury prevention program that offered employees a combination of education, training, physical fitness activities, and ergonomic improvement. The control group was neither given the HRA nor offered the program. The back injury and cost data of both the control and intervention groups were collected before and after the 1-year intervention. The results showed a modest overall decline in back pain prevalence rates, but significant improvement in satisfaction and reduction in risky behaviors. Cost-benefit analysis showed the net benefit of introducing back injury prevention program was $161,108, and the return on investment is 179 percent. Therefore, the study offers suggestive evidence for the initial benefits of a back injury prevention program and lends support to the widely held belief that health promotion in the workplace can reduce employee health risks, increase healthful behaviors and attitudes, and improve attitudes toward the employer organization.Whether such intervention will continue to reap benefits in future years depends, to a large extent,on a favorable work environment and the maintenance and continuation of positive behavioral changes. PMID:8464977

Shi, L

1993-01-01

161

Habitat-related variation in infestation of lizards and rodents with Ixodes ticks in dense woodlands in Mendocino County, California  

Microsoft Academic Search

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

Rebecca J. Eisen; Lars Eisen

2004-01-01

162

The relationship of family income to the incidence, external causes, and outcomes of serious brain injury, San Diego County, California.  

PubMed Central

Among residents of San Diego County, California the incidence and external causes of serious brain injury were related to the median family income of the census tract of residency. Low income tracts had high incidence rates--a finding not changed by adjustment for age and race/ethnicity. For those injured, the type of emergency transport, time from injury to treatment, and outcome of treatment were not related to the median income of the census tract of residency. PMID:3766837

Kraus, J F; Fife, D; Ramstein, K; Conroy, C; Cox, P

1986-01-01

163

Canine heartworm ( Dirofilaria immitis) in Fresno and Madera Counties, California: Prevalence differences between foothill and valley habitats  

Microsoft Academic Search

The aim of this study was to assess the prevalence of heartworm in domestic dogs in Madera and Fresno Counties, California, dependent on habitat and other host and environmental factors. Dogs were screened for presence of heartworm antigen using the PetChek® ELISA on blood samples (N=519) collected at seven sites during April-July 2009. Eighteen dogs were heartworm antigen positive. Pearson

Laura L. Miller; Paul R. Crosbie

2011-01-01

164

Fluoride, nitrate and water hardness in groundwater supplied to the rural communities of Ensenada County, Baja California, Mexico  

Microsoft Academic Search

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

L. W. Daesslé; L. Ruiz-Montoya; H. J. Tobschall; R. Chandrajith; V. F. Camacho-Ibar; L. G. Mendoza-Espinosa; A. L. Quintanilla-Montoya; K. C. Lugo-Ibarra

2009-01-01

165

The geology, carbonaceous materials, and origin of the epigenetic uranium deposits in the Tertiary Sespe Formation in Ventura County, California  

SciTech Connect

Uranium deposits have been known in western Ventura County, California, since about 1959. These epigenetic uranium deposits are found in and are probably derived from the Tertiary Sespe Formation, which is of continental origin. The sandstone-filled paleochannels served as ground-water conduits that carried uranium-bearing solutions to the depositional site. The uranium mineralization took place when the humate was deposited (perhaps near the seashore where terrestrial and marine interacted) or perhaps shortly thereafter.

Dickinson, K.A.; Leventhal, J.S.

1988-01-01

166

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

USGS Publications Warehouse

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.

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

2011-01-01

167

Enhancing and Maintaining Water Service Quality for Metropolises: A Case Study of the City and County of San Francisco, California, USA  

Microsoft Academic Search

The City and County of San Francisco supplies treated and raw water directly or indirectly to approximately 2.4 million consumers within five California counties and at various other locations along the transmission route from its principal water source in the Sierra Nevada. From a small-scale private entity formed to meet local neighbourhood needs in 1851, the San Francisco water system

Michael D. Lee

2002-01-01

168

Vegetation and Small Vertebrates of Oak Woodlands at Low and High Risk for Sudden Oak Death in San Luis Obispo County, California1  

Microsoft Academic Search

San Luis Obispo County contains oak woodlands at varying levels of risk of sudden oak death (SOD), caused by a fungal pathogen (Phytophthora ramorum) that in the past decade has killed thousands of oak (Quercus spp.) and tanoak (Lithocarpus densiflorus) trees in California. SOD was most recently detected 16 km north of the San Luis Obispo County line. Low-risk woodlands

Douglas J. Tempel; William D. Tietje; Donald E. Winslow

169

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

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)…

Los Angeles County Commission on Human Relations, CA.

170

Key to the Willows (Salix spp.) of Santa Cruz County, California 1 Bud scale sharply pointed, free (overlapping edges on inside of bud). Leaves lanceolate,  

E-print Network

with high water table. Salix lasiandra var. lasiandra (formerly Salix lucida ssp. lasiandra) (shining willowKey to the Willows (Salix spp.) of Santa Cruz County, California 1 Bud scale sharply pointed, free. Mostly found in South County along edges of lakes, ponds, and streams. Salix laevigata (red willow) 1

California at Santa Cruz, University of

171

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

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.

Fong, Darren; Howell, Judd A.

2006-01-01

172

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

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…

Gwynn, Douglas; And Others

173

76 FR 42112 - Humboldt (NV) Resource Advisory Committee  

Federal Register 2010, 2011, 2012, 2013

...Forest Service Humboldt (NV) Resource Advisory Committee AGENCY...SUMMARY: The Humboldt (NV) Resource Advisory Committee will meet...implementaion and recommend funding allocations for selected projects. DATES...recommend and decide on funding allocations for proposed projects,...

2011-07-18

174

Field efficacy of deltamethrin for rodent flea control in San Bernardino County, California, USA.  

PubMed

A study was conducted to determine the initial and residual activity of deltamethrin (0.05% dust) applied to rodent burrows (at approximately 14 g/burrow) against fleas in the Silverwood Lake area of San Bernardino County. In initial toxicity (2-d post-treatment), deltamethrin provided 97% flea control and in residual toxicity it resulted in 68% control of the rodent fleas at 15-d post-treatment. The flea fauna consisted of Oropsylla montana (89.9%) and Hoplopsylls anomalus (10.1%). All rodents captured in this study were California ground squirrels, Spermophilus beecheyi. In mark-release-recapture trials, using the microchip identification implant method at the treatment site, the recapture rate of rodents was 29% from 2- to 58-d post-treatment, declining to 21% after 98 d. In the tail-clip method at the treatment site, the recapture rate of 40% at 15-d post-treatment rose to 87% and 73% at 56- and 58-d post-treatment, respectively. At the control site, the recapture rate of 100% at 15-d post-post-treatment dropped to 20% after 98 d. In another trial at Camp Cedar Crest in the Running Springs area, deltamethrin applied to rodent burrows resulted in 70% control of fleas infesting S. beecheyi. Based on the two trials, deltamethrin showed a good initial control of rodent fleas in enzootic or epizootic plague control. PMID:15707280

Mian, Lal S; Hitchcock, James C; Madon, Minoo B; Myers, Charles M

2004-12-01

175

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

SciTech Connect

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.

Croyle, W.A.; Rosenbaum, S.E. [California Regional Water Quality Control Board, Sacramento, CA (United States)

1996-11-01

176

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

USGS Publications Warehouse

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.

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

1995-01-01

177

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

SciTech Connect

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.

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

1987-06-01

178

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

SciTech Connect

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.

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

1985-04-01

179

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

NASA Technical Reports Server (NTRS)

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.

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

1980-01-01

180

Hydrologic data for Long Valley Caldera, Mono County, California, 1994-96  

USGS Publications Warehouse

Hydrologic data were collected during 1994?96 as part of the U.S. Geological Survey's long-term Volcanic Hazards Monitoring Program of the Long Valley Caldera, Mono County, California, and the Long Valley Hydrologic Advisory Committee monitoring program. Hydrologic data collected include continuous record of ground-water levels in 4 wells; instantaneous measurements of ground-water levels in 53 wells; continuous record of discharge at 2 surface-water sites and 4 springs; continuous record of stage at 1 thermal pool; instantaneous discharge measurements at 3 surface-water sites; ground-water temperature profiles of 5 thermal wells and 1 nonthermal well; continuous record of water temperature in 3 springs; vent gas temperature at 1 fumarole; and chemical and isotopic analyses of water samples collected at 5 wells, 7 springs, and 5 surface-water sites. Precipitation amounts at 3 sites, and water equivalence of snowpack at 3 sites also are included. The data are presented in graphs or tables.

Howle, James F.; Farrar, Christopher D.

2001-01-01

181

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

USGS Publications Warehouse

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)

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

1979-01-01

182

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

SciTech Connect

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-term remediation. Examination of nitrate concentration in relation to groundwater age indicates that the nitrate management plan has not yet resulted in a decrease in the flux of nitrate to the shallow aquifer in the areas tested.

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

183

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

Federal Register 2010, 2011, 2012, 2013

...Implementation Plan, Placer County Air Pollution Control District AGENCY: Environmental...approve revisions to the Placer County Air Pollution Control District (PCAPCD) portion of...Burning Smoke Management, PCAPCD Rule 304 Land Development Smoke Management,...

2013-01-31

184

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

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2013-01-31

185

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

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2010-01-11

186

76 FR 44809 - Revisions to the California State Implementation Plan, Placer County Air Pollution Control...  

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2011-07-27

187

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

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2010-05-05

188

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

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2011-05-09

189

76 FR 28944 - Revisions to the California State Implementation Plan, Placer County Air Pollution Control...  

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2011-05-19

190

75 FR 56889 - Revisions to the California State Implementation Plan, San Diego County Air Pollution Control...  

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2010-09-17

191

76 FR 67366 - Revisions to the California State Implementation Plan, Placer County Air Pollution Control...  

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2011-11-01

192

75 FR 69002 - Revisions to the California State Implementation Plan, Imperial County Air Pollution Control...  

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2010-11-10

193

76 FR 71886 - Revisions to the California State Implementation Plan, Placer County Air Pollution Control...  

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2011-11-21

194

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

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2011-05-06

195

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

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2010-02-23

196

76 FR 7142 - Revisions to the California State Implementation Plan, Imperial County Air Pollution Control...  

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...Implementation Plan, Imperial County Air Pollution Control District AGENCY: Environmental...revisions to the Imperial County Air Pollution Control District (ICAPCD) portion...permitting requirements, for various air pollution sources. We are taking...

2011-02-09

197

Long term compliance with California's Smoke-Free Workplace Law among bars and restaurants in Los Angeles County  

PubMed Central

Objective: To assess long term compliance with the California Smoke-Free Workplace Law in Los Angeles County freestanding bars and bar/restaurants. Design: Population based annual site inspection survey of a random sample of Los Angeles County freestanding bars and bar/restaurants was conducted from 1998 to 2002. Main outcome measures: The primary outcomes of interest were patron and employee smoking. The secondary outcomes of interest were the presence of ashtrays and designated outdoor smoking areas. Results: Significant increases in patron non-smoking compliance were found for freestanding bars (45.7% to 75.8%, p < 0.0001) and bar/restaurants (92.2% to 98.5%, p < 0.0001) between 1998 and 2002. Increases in employee non-smoking compliance were found for freestanding bars (86.2% to 94.7%, p < 0.0003) and bar/restaurants (96.5% to 99.2%, p < 0.005). Conclusions: This study provides clear evidence that the California Smoke-Free Workplace Law has been effective at reducing patron and employee smoking in Los Angeles County bars and restaurants. Recommendations include educational campaigns targeted to freestanding bar owners and staff to counter perceptions of lost revenue, more rigorous enforcement, and more severe penalties for repeat violators such as alcohol licence revocation. Policymakers can enact smoke-free restaurant and bar policies to protect employees and patrons from secondhand smoke, confident that these laws can be successfully implemented. PMID:12958386

Weber, M; Bagwell, D; Fielding, J; Glantz, S

2003-01-01

198

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

SciTech Connect

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.

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

1985-10-01

199

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

SciTech Connect

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.

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

1987-01-01

200

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

SciTech Connect

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.

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

1987-09-01

201

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

SciTech Connect

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.

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

1988-01-01

202

California GAMA Program: Sources and Transport of Nitrate in Shallow Groundwater in the Llagas Basin of Santa Clara County, California.  

National Technical Information Service (NTIS)

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 t...

2005-01-01

203

Proceedings of the 2004 Humboldt Bay Symposium ... 215 Successionina HumboldtBayMarineFouling  

E-print Network

and hydroids, almost all of which were introduced to Humboldt Bay. Rainstorms, which brought fresh water is one of the lead- ing causes of the biodiversity crisis (Wilcove et al. 1998). The release of larvae

Craig, Sean

204

SALMON-TRINITY ALPS WILDERNESS, CALIFORNIA.  

USGS Publications Warehouse

The Salmon-Trinity Alps Wilderness in the Klamath Mountains province occupies an area of about 648 sq mi in parts of Trinity, Siskiyou, and Humboldt Counties, northwestern California. As a result of field studies it was determined that the Salmon-Trinity Alps Wilderness has an area with substantiated potential for gold resources in known lode deposits. Small amounts of quicksilver have been produced from one mine but there is little promise for the discovery of additional mercury resources. Geochemical sampling showed that anomalously high amounts of several other metals occur in a few places, but there is little promise for the discovery of energy or mineral resources other than mercury and gold.

Hotz, Preston E.; Thurber, Horace K.

1984-01-01

205

Diatom biostratigraphy from dolomites in Monterey Formation, Rodeo Canyon to Point Pedernales, southwestern Santa Barbara County, California  

SciTech Connect

Eight-six samples were collected from three stratigraphic sections in southwestern Santa Barbara County, California: Rodeo Canyon, Lyons Head, and Point Pedernales. In this area, the Monterey Formation is exposed in prominent cliffs along the coast from Rodeo Canyon on the south, to Lyons Head and Point Pedernales on the west. Because most of the opal-A in the Monterey diatomaceous shale in this area was converted to opal-CT and/or microcrystalline quartz, the diatoms are poorly preserved or obliterated. Therefore, the age of these rocks has been in question for a long time. Twenty-five 86 samples yielded age diagnostic diatoms that range from the early Miocene, late Relizian, Annellus californicus zone, to the early Pliocene, late Delmontian, Thalassiosira oestrupii zone. These ages can be directly related to those of diatomaceous shales, mudstones, and dolomites in the California offshore.

Wornardt, W.W.

1986-04-01

206

Inventory of San Joaquin kit fox on land proposed as Phase II, Kesterson Reservoir, Merced County, California  

SciTech Connect

A survey of potential San Joaquin kit fox, Vulpes macrotis mutica, habitat was conducted for the US Department of the Interior Water and Power Resource Service between 23 and 25 March 1981 on lands proposed as Phase II, Kesterson Reservoir, Merced County, California. Results of ground transects covering approximately 3000 acres revealed no sign (dens, tracks, or scats) of kit fox. No kit fox were observed during four night spotlight surveys. Neither completion of Phase II nor subsequent operation and maintenance activities will have any known negative impact on the endangered San Joaquin kit fox.

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

1981-04-01

207

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

SciTech Connect

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.

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

1986-11-01

208

Evaluation of the San Dieguito, San Elijo, and San Pasqual hydrologic subareas for reclaimed water use, San Diego County, California  

USGS Publications Warehouse

A study was made to determine the suitability of three small hydrologic subareas in San Diego County, California, for reuse of municipal wastewater. Ground-water quality has been impacted by agricultural water use, imported water use, changes in natural recharge patterns, seawater intrusion, and intrusion of ground water from surrounding marine sediments; therefore, ground water is of limited value as a water-supply source. Reclaimed water use is feasible and expected to improve ground-water quality, creating a new source of water for agricultural use. (USGS)

Izbicki, J. A.

1983-01-01

209

Evaluation of the Mission, Santee, and Tijuana hydrologic subareas for reclaimed-water use, San Diego County, California  

USGS Publications Warehouse

A study was made to determine the suitability of three small hydrologic subareas in San Diego County, California, for reuse of treated municipal wastewater (reclaimed water). Groundwater quality has been impacted by agricultural water use, changes in natural recharge patterns, seawater intrusion, and groundwater movement from surrounding marine sediments. Groundwater levels near land surface may limit artificial recharge of reclaimed water or may require pumping of groundwater from the aquifer prior to recharge with reclaimed water. Reclaimed water may be used for irrigated water in upland areas. (USGS)

Izbicki, J. A.

1985-01-01

210

Humboldt University Berlin Computer Science Department  

E-print Network

25 D-12489 Berlin-Adlershof Germany Phone: +49 30 2093-3400 Fax: +40 30 2093-3112 http://sar Report SAR-PR-2007-03 February 2007 Author(s): Ulf Hermann #12;Humboldt-Universit¨at zu Berlin, Institut-Anwendung zur Definition und ¨Uberwachung der Aufgaben, einem Server ("Wrapper"), der die eigentliche Simulation

211

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

SciTech Connect

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.

Hahn, J.L.

1981-08-01

212

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

USGS Publications Warehouse

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, nitrous oxide, and carbon monoxide. Drill cuttings were analyzed for denitrifying and nitrate-reducing bacteria. One of the boreholes installed adjacent to the Joshua Basin Water District proposed groundwater-recharge facility was installed by using the ODEX air-hammer method and the other was installed by using a 7.875-inch hollow-stem auger. Drilling procedures, lithologic and geophysical data, construction details, and instrumentation placed in these boreholes are described; however, geochemical data were not available at the time of publication.

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

2012-01-01

213

Preliminary geologic map of the Elsinore 7.5' Quadrangle, Riverside County, California  

USGS Publications Warehouse

Open-File Report 03-281 contains a digital geologic map database of the Elsinore 7.5’ quadrangle, Riverside County, California that includes: 1. ARC/INFO (Environmental Systems Research Institute, http://www.esri.com) version 7.2.1 coverages of the various elements of the geologic map. 2. A Postscript file to plot the geologic map on a topographic base, and containing a Correlation of Map Units diagram (CMU), a Description of Map Units (DMU), and an index map. 3. Portable Document Format (.pdf) files of: a. This Readme; includes in Appendix I, data contained in els_met.txt b. The same graphic as plotted in 2 above. Test plots have not produced precise 1:24,000-scale map sheets. Adobe Acrobat page size setting influences map scale. The Correlation of Map Units and Description of Map Units is in the editorial format of USGS Geologic Investigations Series (I-series) maps but has not been edited to comply with I-map standards. Within the geologic map data package, map units are identified by standard geologic map criteria such as formation-name, age, and lithology. Where known, grain size is indicated on the map by a subscripted letter or letters following the unit symbols as follows: lg, large boulders; b, boulder; g, gravel; a, arenaceous; s, silt; c, clay; e.g. Qyfa is a predominantly young alluvial fan deposit that is arenaceous. Multiple letters are used for more specific identification or for mixed units, e.g., Qfysa is a silty sand. In some cases, mixed units are indicated by a compound symbol; e.g., Qyf2sc. Even though this is an Open-File Report and includes the standard USGS Open-File disclaimer, the report closely adheres to the stratigraphic nomenclature of the U.S. Geological Survey. Descriptions of units can be obtained by viewing or plotting the .pdf file (3b above) or plotting the postscript file (2 above).

Morton, Douglas M.; Weber, F. Harold, Jr.; Digital preparation: Alvarez, Rachel M.; Burns, Diane

2003-01-01

214

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

ERIC Educational Resources Information Center

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…

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

2008-01-01

215

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

SciTech Connect

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) proximity to areas where geophysical surveys had been performed, (2) accessibility of the site for drill rig setup, and (3) favorability for obtaining the maximum information possible concerning the geology and the resources. Necessary landowner permission and permits were secured for these sites, and actual drilling began on December 17, 1980. Drilling was terminated on February 4, 1981, with the completion of three holes that ranged in depth from 205 to 885 feet. Use of a relatively new drilling technique called the Dual Tube Method enabled the collection of precise subsurface data of a level of detail never before obtained in the Calistoga area. As a result, a totally new and unexpected picture of the geothermal reservoir conditions there has been obtained, and is outlined in this addendum report.

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

1981-05-01

216

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

SciTech Connect

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.

Busby, C

2009-11-24

217

78 FR 32274 - Scorpion Pier Replacement Project, Channel Islands National Park, Santa Barbara County, California  

Federal Register 2010, 2011, 2012, 2013

...Scorpion Pier Replacement Project, Channel Islands National Park, Santa Barbara County...the existing Scorpion Pier at Santa Cruz Island's eastern waterfront. The NPS is the...comments by mail to Superintendent, Channel Islands National Park, Attn: Scorpion Pier...

2013-05-29

218

77 FR 58313 - Revisions to the California State Implementation Plan, San Diego County, Antelope Valley and...  

Federal Register 2010, 2011, 2012, 2013

...Valley and Monterey Bay Unified Air Pollution Agencies AGENCY: Environmental...revisions to the San Diego County Air Pollution Control District (SDCAPCD), Monterey Bay Unified Air Pollution Control District (MBUAPCD)...

2012-09-20

219

78 FR 75293 - Approval and Promulgation of Implementation Plans; State of California; 2012 Los Angeles County...  

Federal Register 2010, 2011, 2012, 2013

...Angeles County are two large lead-acid battery recycling facilities, Exide...These facilities receive used lead-acid batteries and other lead-bearing materials...NAAQS were at sites near the lead-acid battery recyclers, SCAQMD's...

2013-12-11

220

7 CFR 301.92-3 - Quarantined and regulated areas.  

Code of Federal Regulations, 2011 CFR

...3) The following areas are designated as quarantined areas: California Alameda County . The entire county. Contra Costa County . The entire county. Humboldt County . The entire county. Lake County . The entire county. Marin...

2011-01-01

221

7 CFR 301.92-3 - Quarantined and regulated areas.  

Code of Federal Regulations, 2010 CFR

...3) The following areas are designated as quarantined areas: California Alameda County . The entire county. Contra Costa County . The entire county. Humboldt County . The entire county. Lake County . The entire county. Marin...

2010-01-01

222

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

PubMed Central

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

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

223

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

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)

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

1990-01-01

224

Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles County, California  

E-print Network

traffic and adverse birth outcomes in Los Angeles County, California, 1994-1996. Environ HealthHealth 2011, 10:89 http://www.ehjournal.net/content/10/1/89 RESEARCH Open Access Traffic-traffic-related air pollution impacts on birth outcomes. Environ Health

Wilhelm, Michelle; Ghosh, Jo Kay; Su, Jason; Cockburn, Myles; Jerrett, Michael; Ritz, Beate

2011-01-01

225

Schweickert, R. A.; and Merguerian, Charles, 1980, Augen gneiss in the Shoo Fly Complex, Tuolumne County, California -a pre-Middle Jurassic plutonic episode.  

E-print Network

County, California - a pre-Middle Jurassic plutonic episode. An ancient, deformed plutonic suite-mid Jurassic east-plunging, E-W trending fold system (F4), and intruded by Late Jurassic mafic dikes. Isotropic Jurassic-Late Cretaceous SNB is essentially undefined at present. To Cite This Abstract: Schweickert, R. A

Merguerian, Charles

226

Demographic Factors Associated With Perceptions About Water Safety and Tap Water Consumption Among Adults in Santa Clara County, California, 2011  

PubMed Central

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

Webber, Whitney L.; Stoddard, Pamela; Shah, Roshni; Martin, Lori; Broderick, Bonnie; Induni, Marta

2014-01-01

227

Cone penetration tests and soil borings at the Mason Road site in Green Valley, Solano County, California  

USGS Publications Warehouse

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.

Bennett, Michael J.; Noce, Thomas E.; Lienkaemper, James J.

2011-01-01

228

Detection of Neorickettsia risticii from various freshwater snail species collected from a district irrigation canal in Nevada County, California.  

PubMed

This study investigated the role of a district irrigation canal in Nevada County, California, USA, as the point source of infection for Neorickettsia risticii, causative agent of equine neorickettsiosis (EN). A total of 568 freshwater snails comprising Juga spp., Planorbella subcrenata (Carpenter, 1857) (Rough Rams-horn), Physella virgata (Gould, 1855) (Protean Physa) and feces from three horses with EN were collected and tested for N. risticii by real-time PCR. A total of four freshwater snails tested PCR positive for N. risticii. Phylogenetic analysis showed 99.8-100% homology between the different snail and horse N. risticii isolates. This study represents the first report of infection with N. risticii in Planorbella subcrenata and suggests that the irrigation canal was the aquatic environment responsible for the spread of N. risticii. PMID:23566936

Pusterla, Nicola; Hagerty, Daniel; Mapes, Samantha; Vangeem, Josh; Groves, Lindsey T; Dinucci, Mario; Fielding, Langdon C; Higgins, Jill C

2013-08-01

229

Public health assessment for National Semiconductor Corporation, Santa Clara County, California, Region 9. CERCLIS No. CAD041472986. Final report  

SciTech Connect

The National Semiconductor Corporation site, located in Santa Clara, Santa Clara County, California, was placed on the National Priorities List (NPL) by the US Environmental Protection Agency (EPA) on July 21, 1987. Several underground acid waste and solvent sumps and tanks, leaks in chemical piping, and aboveground chemical storage areas apparently leaked volatile organic compounds (VOCs), semi-volatile compounds, and metals into the subsurface soils and groundwater. Some of these underground tanks and some but not all of the surrounding contaminated soil have been excavated and removed from the site. Various organic and inorganic pollutants have been detected in on-site and off-site groundwater at levels of human concern. However the contaminated groundwater is not a source of drinking water.

Not Available

1993-06-23

230

Invasive range expansion by the Humboldt squid, Dosidicus gigas, in the eastern North Pacific.  

PubMed

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

Zeidberg, Louis D; Robison, Bruce H

2007-07-31

231

Invasive range expansion by the Humboldt squid, Dosidicus gigas, in the eastern North Pacific  

PubMed Central

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

Zeidberg, Louis D.; Robison, Bruce H.

2007-01-01

232

Mesocarnivore Surveys on Lawrence Livermore National Laboratory Site 300, Alameda and San Joaquin Counties, California  

SciTech Connect

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.

Clark, H O; Smith, D A; Cypher, B L; Kelly, P A; Woollett, J S

2004-11-16

233

Point process modeling of wildfire hazard in Los Angeles County, California  

Microsoft Academic Search

The Burning Index (BI) produced daily by the United States government's National Fire Danger Rating System is commonly used in forecasting the hazard of wildfire activity in the United States. However, recent evaluations have shown the BI to be less effective at predicting wildfires in Los Angeles County, compared to simple point process models incorporating similar meteorological information. Here, we

Haiyong Xu; Frederic Paik Schoenberg

2011-01-01

234

Sediment transport and deposition, Walnut and Pacheco Creeks, Contra Costa County, California, August 1965-April 1970  

USGS Publications Warehouse

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.

Porterfield, George

1972-01-01

235

Latino Youth in the Juvenile Drug Court of Orange County, California  

Microsoft Academic Search

This study examines the factors associated with successful completion of the Orange County Juvenile Drug Court (OCJDC) for 232 (164 male and 68 female) adolescents between the ages of 12 and 17 years. No significant associations were found between graduation status and participants’ age, most serious prior offense, entry offense, primary drug of choice, or secondary drug of choice. While

Henry F. Fradella; Ryan G. Fischer; Christine Hagan Kleinpeter; Jeffrey J. Koob

2009-01-01

236

Summary and evaluation of the coyote control program on Naval Petroleum Reserve No. 1, Kern County, California, 1987  

SciTech Connect

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.

Scrivner, J.H.

1987-09-01

237

Cascadia Earthquake and Tsunami Scenario for California's North Coast  

NASA Astrophysics Data System (ADS)

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 from 51 to 73 percent and knowing what the Cascadia subduction zone is from 16 to 42 percent. It is not surprising that the earlier surveys showed increases as several strong earthquakes occurred in the area between 1992 and 1995 and there was considerable media attention. But the 2001 survey, seven years after the last widely felt event, still shows significant increases in almost all preparedness indicators. The 1995 CDMG scenario was not the sole reason for the increased interest in earthquake and tsunami hazards in the area, but the scenario gave government recognition to an event that was previously only considered seriously in the scientific community and has acted as a catalyst for mitigation and planning efforts.

Dengler, L.

2006-12-01

238

Effectiveness of Vegetated Buffer Strips in Reducing Dormant Season Orthophosphate Pesticide Loading to Surface Waters in Glenn County, Northern California  

NASA Astrophysics Data System (ADS)

Riparian buffer strips are used in preventing nonpoint source contamination of agricultural runoff. The design and effectiveness of buffers varies widely under differing environmental conditions. Over the past two years, a project was implemented to evaluate the effectiveness of certain Best Management Practices in reducing organophosphate (OP) pesticide transport from almond orchards to local surface waters in Glenn County, northern California. Diazinon is a commonly-used OP pesticide applied during the dormant season in almond and stone-fruit orchards throughout the California Central Valley. Dormant season diazinon application coincides with the months of greatest rainfall and surface runoff in California. Three filter strip treatments were established: one planted with native vegetation, one with weedy resident vegetation, and the third with a bare soil surface. As a demonstration and reconnaissance project, replication of the treatments in this study was lacking (one plot of each vegetation type and two bare ground plots). Diazinon was applied in test orchard cells in January 2003. Surface runoff, shallow groundwater in the root zone, and deeper groundwater were monitored for the transport of diazinon during the three subsequent storm events. Composite surface water samples and flow volumes were obtained for each storm event using automated surface water collectors. Runoff and infiltration results indicate greater infiltration occurred in the vegetated plots as would be expected. Infiltration on bare ground plots was approximately 25%-50% less than on the vegetated plots. However, differences between the two vegetated plot treatments were less than 5%. Diazinon concentrations were reduced as surface runoff crossed the buffer strips for all three treatments. Detectable levels of diazinon were still present in runoff following the third storm, seven weeks after the pesticide application. Further replicated studies are currently being prepared for the coming dormant season and this study will continue over the next three years.

Gilbert, K. D.; Brown, D. L.; Altier, L.; Oliver, M. N.

2003-12-01

239

Reproductive Success of Oak Woodland Birds in Sonoma and Napa Counties, California1  

Microsoft Academic Search

Birds are often used as environmental indicators because they are conspicuous, they have a very broad constituency, respond to change at multiple spatial scales, and are sampled by standard protocols. However simple counts of birds may provide an incomplete picture of the response of bird populations to environmental change in rapidly changing landscapes like California's oak woodlands. Demographic data such

Mark Reynolds; Thomas Gardali; Matt Merrifield; Robin Hirsch-Jacobsen; Amon Armstrong; David Wood; Julia Smith; Emily Heaton; Gretchen LeBuhn

240

Mineral resources of the Tunnison Mountain Wilderness Study Area, Lassen County, California  

Microsoft Academic Search

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

J. A. Peterson; J. G. Frisken; D. Plouff; C. A. Goeldner; S. R. Munts

1988-01-01

241

Mineral resources of the Tunnison Mountains Wilderness Study Area, Lassen County, California  

Microsoft Academic Search

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

J. A. Peterson; J. G. Friskin; D. Plouff; C. A. Goeldner; S. R. Munts

1988-01-01

242

Eocene palynomorphs from the black diamond mines regional preserve, contra costa county, California  

Microsoft Academic Search

Palynomorphs from Eocene coaly deposits of the Black Diamond Mines Regional Preserve in California are described. Thirty?two species of spores and pollen are recognized and two of them, Graminidites scabratus and Arecipites antiochus, are regarded as new. The encountered specimens are characterized by 26% spores, 32% gymnosperm pollen, 41% angiosperm pollen, and 1% foraminifers. The climate is considered to be

Abbas Kimyai

1993-01-01

243

Deformation of Long Valley caldera, Mono County, California, from 1975 to 1982  

Microsoft Academic Search

In 1975, Long Valley caldera in eastern California was being considered as a potential geothermal resource, and a number of investigations were conducted. Some of the data obtained imply a radial deformation of Long Valley caldera centered on the resurgent dome. In this paper the deformation data for Long Valley caldera from 1975 to 1982 are presented and discussed with

R. P. Denlinger; Francis Riley

1984-01-01

244

Arsenic speciation in pyrite and secondary weathering phases, Mother Lode Gold District, Tuolumne County, California  

Microsoft Academic Search

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 ?20–1300 ppm As. The highest concentrations are in weathering crusts from the

Kaye S Savage; Tracy N Tingle; Peggy A O’Day; Glenn A Waychunas; Dennis K Bird

2000-01-01

245

Deep Springs fault, Inyo County, California: An example of the use of relative-dating techniques  

Microsoft Academic Search

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

1989-01-01

246

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

Microsoft Academic Search

George Smith's career-long study of the surface geology of the Searles Valley was recently published by the USGS (Smith, 2009, online and printed). The co-authors of this abstract are the team responsible for completing the publication from the original materials. Searles Valley is an arid, closed basin lying 70 km east of the south end of the Sierra Nevada, California.

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

2010-01-01

247

California County Data Book, 1999: How Our Youngest Children Are Faring.  

ERIC Educational Resources Information Center

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,…

Children Now, Oakland, CA.

248

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

Federal Register 2010, 2011, 2012, 2013

...The committee is authorized under the Secure Rural Schools and Community Self-Determination...year project's progress. Should the Secure Rural Schools Act be reauthorized, the...year project's progress. Should the Secure Rural Schools Act is reauthorized,...

2013-05-22

249

Endemic coccidioidomycosis in Northern California. An outbreak in the Capay Valley of Yolo County.  

PubMed

Endemicity of coccidioidomycosis in Yolo County, outside previously known endemic areas, was confirmed by occurrence of a small epidemic. Eleven cases of clinically apparent coccidioidomycosis occurred among a group of 23 archaeology students. Eight of the cases were confirmed serologically, and three by skin test conversion alone. The specific site of exposure was an ancient Indian burial ground on Cache Creek near Brooks in the Capay Valley approximately 40 miles northwest of Sacramento. PMID:5798012

Loofbourow, J C; Pappagianis, D; Cooper, T Y

1969-07-01

250

Structural investigations at the Coso geothermal area using remote sensing information, Inyo County, California  

Microsoft Academic Search

Remote sensing studies have been made in and adjacent to the Coso geothermal field using TM FCC satellite imagery, 1:100,000 scale, US Geological Survey orthophotos, 1:24,OOO scale, and proprietary black-and-white photography by California Energy Company, Inc., at various scales including black-and-white positive film transparencies at a scale of 1:6,000. These studies have been made in an attempt to understand the

Ward H. Austin

1990-01-01

251

Ground-water-level monitoring network, Hollister and San Juan Valleys, San Benito County, California  

USGS Publications Warehouse

The addition of 17 wells to the existing 86-well network is proposed to improve the ground-water monitoring in the Hollister and San Juan Valleys in California. The new wells were selected on the basis of well-construction data, availability, location, accessibility, use, and condition, either to replace wells that are no longer accessible or to furnish needed additional data for planning artificial recharge, preparing water-level-contour maps, and digital ground-water modeling. (USGS)

Farrar, C.D.

1981-01-01

252

78 FR 21537 - Revisions to the California State Implementation Plan, Santa Barbara and San Diego County Air...  

Federal Register 2010, 2011, 2012, 2013

...Santa Barbara and San Diego County Air Pollution Control Districts AGENCY: Environmental...revisions to the Santa Barbara County Air Pollution Control District (SBCAPCD) and San Diego County Air Pollution Control District (SDCAPCD)...

2013-04-11

253

Preliminary maps of Quaternary deposits and liquefaction susceptibility, nine-county San Francisco Bay region, California: a digital database  

USGS Publications Warehouse

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 the map units but cannot distinguish the more detailed elements that are present in the database. The report is the product of years of cooperative work by the USGS National Earthquake Hazards Reduction Program (NEHRP) and National Cooperative Geologic Mapping Program, William Lettis and & Associates, Inc. (WLA) and, more recently, by the California Division of Mines and Geology as well. An earlier version was submitted to the Geological Survey by WLA as a final report for a NEHRP grant (Knudsen and others, 2000). The mapping has been carried out by WLA geologists under contract to the NEHRP Earthquake Program (Grants #14-08-0001-G2129, 1434-94-G-2499, 1434-HQ-97-GR-03121, and 99-HQ-GR-0095) and with other limited support from the County of Napa, and recently also by the California Division of Mines and Geology. The current map consists of this new mapping and revisions of previous USGS mapping.

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

254

Classification of ground-water recharge potential in three parts of Santa Cruz County, California  

USGS Publications Warehouse

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)

Muir, K.S.; Johnson, Michael J.

1979-01-01

255

Potential for Induced Seismicity Related to the Northern California CO2 Reduction Project Pilot Test, Solano County, California  

SciTech Connect

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 (10 km) and 10 miles (16 km), respectively. These faults have been identified as active during the Quaternary (last 1.6 million years), but without evidence of displacement during the Holocene (the last 11,700 years). The stress state (both magnitude and direction) in the region is an important parameter in assessing earthquake potential. Although the available information regarding the stress state is limited in the area surrounding the injection well, the azimuth of the mean maximum horizontal stress is estimated at 41{sup o} and it is consistent with strike-slip faulting on the Kirby Hills Fault, unnamed fault segments to the south, and the Rio Vista Fault. However, there are large variations (uncertainty) in stress estimates, leading to low confidence in these conclusions regarding which fault segments are optimally oriented for potential slip induced by pressure changes. Uncertainty in the stress state can be substantially reduced by measurements planned when wells are drilled at the site. Injection of CO{sub 2} at about two miles depth will result in a reservoir fluid pressure increase, which is greatest at the well and decreases with distance from the well. After the injection stops, reservoir fluid pressures will decrease rapidly. Pressure changes have been predicted quantitatively by numerical simulation models of the injection. Based on these models, the pressure increase on the Kirby Hills Fault at its closest approach to the well due to the injection of 6,000 metric tons of CO{sub 2} would be a few pounds per square inch (psi), which is a tiny fraction of the natural pressure of approximately 5,000 psi at that depth. The likelihood of such a small pressure increase triggering a slip event is very small. It is even more unlikely that events would be induced at the significantly greater depths where most of the recorded earthquakes are concentrated, because it is unlikely that such a small pressure pulse would propagate downwards any appreciable distance. Therefore, in response to the specific question of the likelihood of the CO{sub 2} injection caus

Myer, L.; Chiaramonte, L.; Daley, T.M.; Wilson, D.; Foxall, W.; Beyer, J.H.

2010-06-15

256

Mineral resources of the Tunnison Mountain Wilderness Study Area, Lassen County, California  

SciTech Connect

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.

Peterson, J.A.; Frisken, J.G.; Plouff, D.; Goeldner, C.A.; Munts, S.R.

1988-01-01

257

Geology, hydrology, and water supply of Edwards Air Force Base, Kern County, California  

USGS Publications Warehouse

Edwards Air Force Base occupies the northern part of Antelope Valley, California. As a result of large-scale and increasing agricultural pumping in the valley, the net draft has exceeded the perennial supply since about 1930 and was about 170,000 acre-feet in 1951--at least three times the estimated yield. As a result, there has been a continuing depletion of ground water stored in all the unconsolidated deposits, including the principal aquifers contained in the younger and older alluvium.

Dutcher, Lee Carlton; Warts, G. F., Jr.

1963-01-01

258

Ground-water modeling and the installation of deep multiple-well monitoring sites in the Central and West Coast Basins, Los Angeles County, California  

Microsoft Academic Search

An ongoing regional study of the geohydrology and geochemistry of the Central and West Coast Basins in Los Angeles County, California has iteratively combined the drilling of deep multiple-well monitoring sites with groundwater modeling. The monitoring sites are generally between 1,000 and 1,500 ft in depth and consist of 4-6 piezometers installed within a single borehole that provide depth-dependent geohydrologic

E. G. Reichard; T. A. Johnson; M. Land; R. R. Everett; D. J. Ponti; B. D. Edwards; S. M. Crawford; T. Kulshan

2002-01-01

259

Possible Connections Between the Coronado Bank Fault Zone and the Newport-Inglewood, Rose Canyon, and Palos Verdes Fault Zones Offshore San Diego County, California  

Microsoft Academic Search

High-resolution multichannel seismic-reflection and deep-tow Huntec data collected by the USGS were interpreted to map the Coronado Bank fault zone (CBFZ) offshore San Diego County, California. The CBFZ is comprised of several major strands (eastern, central, western) that change in both orientation and degree of deformation along strike. Between Coronado Bank and San Diego, the CBFZ trends N25W and occupies

R. W. Sliter; H. F. Ryan

2003-01-01

260

Emergency Assessment of Debris-Flow Hazards from Basins Burned by the 2007 Buckweed Fire, Los Angeles County, Southern California  

USGS Publications Warehouse

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.

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

261

Emergency Assessment of Debris-Flow Hazards from Basins Burned by the 2007 Canyon Fire, Los Angeles County, Southern California  

USGS Publications Warehouse

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.

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

262

Use of density equalizing map projections (DEMP) in the analysis of childhood cancer in four California counties  

SciTech Connect

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.

Merrill, D.W. Selvin, S.; Close, E.R.; Holmes, H.H.

1995-04-01

263

Emergency Assessment of Debris-Flow Hazards from Basins Burned by the 2007 Santiago Fire, Orange County, Southern California  

USGS Publications Warehouse

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.

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

264

Emergency Assessment of Debris-Flow Hazards from Basins Burned by the 2007 Ammo Fire, San Diego County, Southern California  

USGS Publications Warehouse

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.

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

265

Emergency Assessment of Debris-Flow Hazards from Basins Burned by the 2007 Rice Fire, San Diego County, Southern California  

USGS Publications Warehouse

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.

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

266

Emergency Assessment of Debris-Flow Hazards from Basins Burned by the 2007 Witch Fire, San Diego County, Southern California  

USGS Publications Warehouse

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.

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

267

Emergency Assessment of Debris-Flow Hazards from Basins Burned by the 2007 Harris Fire, San Diego County, Southern California  

USGS Publications Warehouse

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.

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

268

Emergency Assessment of Debris-Flow Hazards from Basins Burned by the 2007 Poomacha Fire, San Diego County, Southern California  

USGS Publications Warehouse

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.

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

269

Preliminary Image Map of the 2007 Witch Fire Perimeter, Ramona Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

270

Preliminary Image Map of the 2007 Witch Fire Perimeter, Tule Springs Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

271

Preliminary Image Map of the 2007 Witch Fire Perimeter, Valley Center Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

272

Preliminary Image Map of the 2007 Witch Fire Perimeter, Poway Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

273

Preliminary Image Map of the 2007 Witch Fire Perimeter, Escondido Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

274

Preliminary Image Map of the 2007 Witch Fire Perimeter, Santa Ysabel Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

275

Preliminary Image Map of the 2007 Witch Fire Perimeter, San Pasqual Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

276

Preliminary Image Map of the 2007 Witch Fire Perimeter, Warners Ranch Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

277

Preliminary Image Map of the 2007 Harris Fire Perimeter, Potrero Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

278

Preliminary Image Map of the 2007 Poomacha Fire Perimeter, Palomar Observatory Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

279

Preliminary Image Map of the 2007 Harris Fire Perimeter, Tecate Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

280

Preliminary Image Map of the 2007 Poomacha Fire Perimeter, Pala Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

281

Preliminary Image Map of the 2007 Harris Fire Perimeter, Barrett Lake Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

282

Preliminary Image Map of the 2007 Harris Fire Perimeter, Otay Mesa Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

283

Preliminary Image Map of the 2007 Harris Fire Perimeter, Dulzura Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

284

Preliminary Image Map of the 2007 Harris Fire Perimeter, Jamul Mountains Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

285

Preliminary Image Map of the 2007 Harris Fire Perimeter, Otay Mountain Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

286

Preliminary Image Map of the 2007 Harris Fire Perimeter, Morena Reservoir Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

287

Preliminary Image Map of the 2007 Canyon Fire Perimeter, Malibu Beach Quadrangle, Los Angeles County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

288

Preliminary Image Map of the 2007 Poomacha Fire Perimeter, Boucher Hill Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

289

Preliminary Image Map of the 2007 Santiago Fire Perimeter, Lake Forest Quadrangle, Orange County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

290

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

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…

California State Postsecondary Education Commission, Sacramento.

291

Birth of a fault: Connecting the Kern County and Walker Pass, California, earthquakes  

USGS Publications Warehouse

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.

Bawden, G. W.; Michael, A. J.; Kellogg, L. H.

1999-01-01

292

Water resources of Soledad, Poway, and Moosa basins, San Diego County, California  

USGS Publications Warehouse

Reclaimed water is being considered as as supplemental water supply in the Soledad, Poway, and Moosa basins, San Diego County. This report describes the geology, soils, hydrology, and cultural factors in each of the basins as they relate to use of reclaimed water. Imported water is currently the major water-supply source in the basins. Groundwater supplies are used to a limited extent for both agricultural and domestic needs. Surface water flows are intermittent and, therefore, have not been developed for use in the basins. All three of the basins have the potential for use of reclaimed water, but only the Moosa basin is currently implementing a plan for such use. Concentrations of dissolved solids, chloride, and sulfate in both ground and surface water commonly exceed local basin objectives. As of 1985, plans for use of reclaimed water are oriented toward improving the quality of the groundwater. (USGS)

Evenson, K.D.

1989-01-01

293

Geohydrology and artificial-recharge potential of the Irvine area, Orange County, California  

USGS Publications Warehouse

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.

Singer, John A.

1973-01-01

294

Drilling, logging and preliminary well testing of geothermal well Susan 1, Susanville, Lassen County, California  

SciTech Connect

Susan 1, a hot water production well, was drilled late in 1980 for the City of Susanville, California, as part of its geothermal space-heating project. A history of drilling, logging, completion and pump testing of this well is presented. Susan 1 was drilled to 930 feet using local river water with a 17-1/2-inch bit from 50 to 540 feet and a 12-1/2-inch bit from 540 to 927 feet. A 12-3/4-inch solid casing was set from surface to 350 feet, a slotted casing from 350 to 538 feet, and a 8-5/8-inch slotted casing from 520 to 925 feet. Interpretations of the following logs and test data from this well are presented: drilling logs (penetration rate, water loss and gain, return temperatures); formation logs (description of well cuttings, caliper, spontaneous potential, electrical resistivity, gamma ray, neutron); production logs (temperature, spinner); and pump test data.

McNitt, J.R.; Petersen, C.A.; Sanyal, S.K.

1981-03-01

295

Tick-borne Relapsing Fever and Borrelia hermsii, Los Angeles County, California, USA  

PubMed Central

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

Raffel, Sandra J.; Schrumpf, Merry E.; Webster, Larry S.; Marques, Adriana R.; Spano, Robyn; Rood, Michael; Burns, Joe; Hu, Renjie

2009-01-01

296

Mathematical model of the West Bolsa Ground-water Basin, San Benito County, California  

USGS Publications Warehouse

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)

Faye, Robert E.

1976-01-01

297

Flood-hazard study: 100-year flood stage for Lucerne Lake, San Bernadino County, California  

USGS Publications Warehouse

A study of the flood hydrology of Lucerne Valley, Calif., was made to develop the 100-year stage for Lucerne Lake. Synthetic-hydrologic techniques were used; and the 100-year flood stage was estimated to be at an elevation of 2,849.3 feet above mean sea level. Channel dimensions were measured at 59 sites in Lucerne Valley. Dranage area-discharge relations developed from channel-geometry data for sites nearby were used to estimate the discharge at 12 additional sites where channel geometry could not be measured. In order to compute the total volume discharge into the playa, the peak discharges were converted to volumes. From the Apple Valley report (Busby, 1975) the equation formulated from the relation between peak discharge and flood volume for the deserts of California was used to compute the flood volumes for routing into Lucerne Lake. (Woodard-USGS)

Busby, Mark William

1977-01-01

298

Emergency assessment of post-fire debris-flow hazards for the 2013 Springs Fire, Ventura County, California  

USGS Publications Warehouse

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.

Staley, Dennis M.

2014-01-01

299

Use of Density Equalizing Map Projections (DEMP) in the analysis of childhood cancer in four California counties. Revision 2  

SciTech Connect

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.

Merrill, D.W.; Close, E.R.; Holmes, H.H. [Lawrence Berkeley Lab., CA (United States); Selvin, S. [Lawrence Berkeley Lab., CA (United States)]|[Univ. of California, Berkeley, CA (United States). School of Public Health

1995-10-01

300

The effect of selenium on reproduction of black-tailed deer (Odocoileus hemionus columbianus) in Shasta County California  

SciTech Connect

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.

Flueck, W.T.

1989-01-01

301

Movements and home range of San Joaquin kit foxes on the Naval Petroleum Reserves, Kern County, California  

SciTech Connect

Movements and home range use of San Joaquin kit foxes (Vulpes macrotis mutica) were studied on and adjacent to the Naval Petroleum Reserves (NPR-1 and NPR-2), Kern County, California, between June 1984 and September 1985. Foxes were studied in an undeveloped area of Buena Vista Valley centered on the border between the Reserves, and in an area of intensive petroleum development in NPR-2 adjacent to the city of Taft. Distances moved nightly did not differ between sexes or between level of petroleum development. Nightly movements averaged 9.4 miles in length during the breeding season, and were significantly longer than the average nightly movements for the pup-rearing (6.4 miles) and pup-dispersal (6.5 miles) seasons. Convex polygon home ranges averaged 1144 acres in size and did not differ between sexes or level of petroleum development. Home ranges of paired males and females overlapped an average of 78%. Home ranges of nonpaired males and females, adjacent males, and adjacent females overlapped an average of 31 to 48%. Although kit foxes were not strongly territorial, home range overlap of paired males and females was significantly greater than that of either nonpaired males and females and males with adjacent home ranges. Home range overlap did not differ between foxes inhabiting developed and undeveloped areas. 42 refs., 10 figs., 9 tabs.

Zoellick, B.W.; O'Farrell, T.P.; Kato, T.T.

1987-09-01

302

Application of advanced geophysical logging methods in the characterization of a fractured-sedimentary bedrock aquifer, Ventura County, California  

USGS Publications Warehouse

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.

Williams, John H.; Lane, John W.; Singha, Kamini; Haeni, F. Peter

2002-01-01

303

Reservoir description is key to steamflood planning and implementation, Webster Reservoir, Midway-Sunset Field, Kern County, California  

SciTech Connect

The Webster reservoir at Midway-Sunset field, Kern County, California, is an unconsolidated sand reservoir of Miocene age (''Stevens equivalent,'' Monterey Formation). The Webster was discovered in 1910 but, due to poor heavy oil (14/sup 0/ API) economics, development for primary production and subsequent enhanced recovery were sporadic. Currently, the reservoir produces by cyclic steam stimulation in approximately 35 wells. Cumulative oil production for the Webster since 1910 is about 13 million bbl. The Webster is subdivided into two reservoirs - the Webster Intermediate and Webster Main. The Webster Intermediate directly overlies the Webster Main in one area but it is separated by up to 300 ft of shale elsewhere. The combined thickness of both Webster reservoirs averages 250 ft and is located at a drilling depth of 1,100-1,800 ft. From evaluation of modern core data and sand distribution maps, the Webster sands are interpreted to have been deposited by turbidity currents that flowed from southwest to northeast in this area. Oil is trapped in the Webster reservoir where these turbidites were subsequently folded on a northwest-southeast-trending anticline. Detailed recorrelation on wireline logs, stratigraphic zonation, detailed reservoir description by zone, and sedimentary facies identification in modern cores has led to development of a geologic model for the Webster. This model indicates that the Webster Intermediate was deposited predominately by strongly channelized turbidity currents, resulting in channel-fill sands, and that the Webster Main was deposited by less restricted flows, resulting in more lobate deposits.

Hall, B.R.; Link, M.H.

1988-01-01

304

Ox Mountain sanitary landfill: Apanolio Canyon expansion site, San Mateo County, California. Volume 2. Appendix. Final report  

SciTech Connect

Further studies include: plants Observed in Apanolio Canyon; Animals Expected or Observed in Apanolio Canyon; Marbled Murrelet Survey; Review of Available Scientific Information on Six Candidate Insects; Update on Status of Candidate Insects; Apanolio Canyon Sensitive Plant Investigation; Fisheries Resources of Upper Apanolio, Benthic Invertebrate Survey of Apanolio, Corinda Los Trancos, and Pilarcitos Creeks, San Mateo County, California; Streamflows and Velocity of Flows at the Bongard diversion Dam in Apanolio Canyon; A Spring Survey to Determine the Presence or Absence of the San Francisco Garter Snake (Thamnophis sirtalis tetrataenis) in Two Tributaries of Pilarcitos Creek, Half Moon Bay, CA; Wildlife and Fisheries Mitigation Plan, Ox Mountain Sanitary Landfill, Apanolio Canyon Expansion Site; Correspondence Site Selection Criteria Information; Draft Contingency Remedial Action Plan; Leachate Collection and Removal System (LCRS) and Leachate/Contaminated Groundwater Treatment Systems; Apanolio Creek Streamflow Augmentation Plan; Apanolio Canyon Lower Aquifer Recharge Plan; Application for Exemptions - Technical Informations; Geotechnical Study and Specifications, Subgrade Barrier and Clay Liner System; Apanolio Canyon Boring Logs; Potentiometric Surface Maps, Apanolio Canyon; Geologic Cross Sections - Apanolio Canyon; Interim Report on Leachate Exposure Test Program, Apanolio Canyon Landfill Expansion.

Not Available

1989-04-01

305

Concentrations of mercury and other metals in black bass (Micropterus spp.) from Whiskeytown Lake, Shasta County, California, 2005  

USGS Publications Warehouse

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 (?g/g) wet weight (ww). Total mercury (HgT) in the same fish whole-body samples ranged from 0.04 to 0.37 (?g/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 ?g/g (ww). These data will serve as a baseline for future monitoring efforts within Whiskeytown Lake.

May, Jason T.; Hothem, Roger L.; Bauer, Marissa L.; Brown, Larry R.

2012-01-01

306

Fluoride, nitrate and water hardness in groundwater supplied to the rural communities of Ensenada County, Baja California, Mexico  

NASA Astrophysics Data System (ADS)

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.

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

307

Public health assessment for Sola Optical USA, Inc. , Petaluma, Sonoma County, California, region 9. CERCLIS No. CAD981171523. Final report  

SciTech Connect

The Public Health Assessment of Sola Optical USA, Inc. is based on a review of the Remedial Investigation report and the Public Health Risk Assessment. The Sola Optical USA, Inc. (Sola) site, located in Petaluma, Sonoma County, California, was placed on the National Priorities List by the EPA on June, 1988. The EPA is the lead governmental agency for the cleanup at the Sola site. Spillage associated with six underground solvent storage tanks resulted in volatile organic contaminants (VOCs) leaking into the subsurface soils and groundwater. These underground tanks and some of the surrounding contaminated soil have been excavated and removed from the site. Various VOCs have been detected in on-site groundwater at levels of human health concern; however the contaminated groundwater is not currently a source of drinking water. An on-site groundwater extraction and treatment system has been in operation since 1987. Based on information reviewed, ATSDR and CDHS have concluded that the Sola site poses no apparent public health hazard.

Not Available

1993-01-06

308

Health assessment for Sulphur Bank Mercury Mine, Clearlake, Lake County, California, Region 9. CERCLIS No. CAD980893275. Preliminary report  

SciTech Connect

The Sulphur Bank Mercury Mine Site is located on the eastern shore of the Oaks Arm of Clearlake, in the City of Clearlake, Lake County, California. The site is on the Environmental Protection Agency's National Priorities List (NPL). This site was mined for sulphur beginning in 1865, and later for mercury. The most extensive surface mining occurred between 1922-1947 and 1955-1957; during these two periods mining waste containing mercury was dumped directly into Clearlake and along the shoreline. The Clearlake surface waters are an important area resource for recreational purposes such as fishing and boating. The human exposure pathway of greatest concern is the consumption of contaminated fish. The state has issued a health advisory regarding consumption of fish from Clearlake. Potential on-site exposure routes include ingestion, inhalation, and dermal contact with contaminated soil and surface water. Potential off-site exposure routes include ingestion and dermal contact with surface water and groundwater; most of the mercury in the lake is contained in bottom sediment and along the shore of Oaks Arm. Based on available information reviewed, the Agency for Toxic Substances and Disease Registry has concluded that this site is a public health hazard.

Not Available

1992-03-04

309

Intensive early season adulticide applications decrease arbovirus transmission throughout the Coachella Valley, Riverside County, California.  

PubMed

In the Coachella Valley of California the seasonal onset of St. Louis encephalitis virus (SLEV), western equine encephalomyelitis virus (WEEV), and West Nile virus (WNV) has been detected consistently at the shoreline of the Salton Sea near the community of North Shore. The timing and intensity of initial amplification in the Culex tarsalis Coquillett/wild bird cycle at this focus seemed closely linked to the subsequent dispersal of virus to the rest of the Coachella Valley and perhaps southern California. In 2004, an attempt was made to interrupt the amplification and dispersal of WNV using ground ultra-low volume (ULV) applications of Pyrenone 25-5. Although these localized treatments were started 1 month after the initial detection in April, surveillance indicated no dispersal from this focus at this time. However, these treatments appeared to have little effect, and WNV eventually was detected throughout the valley, with seven human cases reported in the urbanized upper valley near Palm Springs. In 2005, the initial detection of WNV at North Shore at the end of May was followed rapidly by dispersal throughout the valley precluding efforts at containment. Evaluation of ground and aerial applications at North Shore during May and June 2005, respectively, indicated variable kill of sentinel mosquitoes (overall mortality: ground, 43%; air, 34%) and limited control of the target Cx. tarsalis population. In 2006, aerial ULV applications with the same chemical were begun immediately following the first detection of virus in mid-April, resulting in an apparent reduction of Cx. tarsalis abundance and delay of WNV activity in the rural lower valley and a marked decline in transmission by Culex quinquefasciatus Say populations in the densely populated upper northwestern valley with no human cases reported. PMID:18494603

Lothrop, Hugh D; Lothrop, Branka B; Gomsi, Donald E; Reisen, William K

2008-08-01

310

Preliminary geologic map of the Santa Barbara coastal plain area, Santa Barbara County, California  

USGS Publications Warehouse

This report presents a new geologic digital map of the Santa Barbara coastal plain area at a compilation scale of 1:24,000 (one inch on the map = 2,000 feet on the ground) and with a horizontal positional accuracy of at least 20 m. This preliminary map depicts the distribution of bedrock units and surficial deposits and associated deformation underlying and adjacent to the coastal plain within the contiguous Santa Barbara and Goleta 7.5' quadrangles. A planned second version will extend the mapping westward into the adjoining Dos Pueblos Canyon quadrangle and eastward into the Carpinteria quadrangle. The mapping presented here results from the collaborative efforts of geologists with the U.S. Geological Survey Southern California Areal Mapping Project (SCAMP) (Minor, Kellogg, Stanley, Stone, and Powell) and the tectonic geomorphology research group at the University of California at Santa Barbara (Gurrola and Selting). C.L. Powell, II, performed all new fossil identifications and interpretations reported herein. T.R. Brandt designed and edited the GIS database,performed GIS database integration and created the digital cartography for the map layout. The Santa Barbara coastal plain is located in the western Transverse Ranges physiographic province along a west-trending segment of the southern California coastline about 100 km (62 mi) northwest of Los Angeles. The coastal plain region, which extends from the Santa Ynez Mountains on the north to the Santa Barbara Channel on the south, is underlain by numerous active and potentially active folds and partly buried thrust faults of the Santa Barbara fold and fault belt. Strong earthquakes that occurred in the region in 1925 (6.8 magnitude) and 1978 (5.1 magnitude) are evidence that such structures pose a significant earthquake hazard to the approximately 200,000 people living within the major coastal population centers of Santa Barbara and Goleta. Also, young landslide deposits along the steep lower flank of the Santa Ynez Mountains indicate the potential for continued slope failures and mass movements that may threaten urbanized parts of the coastal plain. Deformed sedimentary rocks in the subsurface of the coastal plain and the adjacent Santa Barbara Channel contain deposits of oil and gas, some of which are currently being extracted. Shallow, localized sedimentary aquifers underlying the coastal plain provide limited amounts of water for the urban areas, but the quality of some of this groundwater is compromised by coastal salt-water contamination. The present map compilation provides a set of uniform geologic digital coverages that can be used for analysis and prediction of these and other geologic hazards and resources in the coastal plain region. In the map area the oldest stratigraphic units consist of resistant Eocene to Oligocene marine and terrestrial sedimentary rocks that form a mostly southward-dipping and laterally continuous sequence along the south flank of the Santa Ynez Mountains. Less resistant, but more variably deformed, Miocene, Pliocene, and Pleistocene marine sedimentary rocks and deposits are exposed in the lower Santa Ynez foothills and in the coastal hills and sea cliffs farther south. Pleistocene and Holocene surficial alluvial, colluvial, estuarine, and marine-terrace deposits directly underlie much of the low-lying coastal plain area, and similar-aged alluvial and landslide deposits locally mantle the lower flanks of the Santa Ynez Mountains. Structurally, the Santa Barbara coastal plain area is dominated by the Santa Barbara fold and fault belt, an east-west-trending zone of Quaternary, partly active folds and blind and exposed reverse and thrust faults. The dominant trend of individual structures within the belt is west-northwest -- slightly oblique to the overall trend of the fold and fault belt. A conspicuous exception, however, is the More Ranch fault system, which strikes east-northeast across the fold and f

Minor, Scott A.; Kellogg, Karl S.; Stanley, Richard G.; Stone, Paul; Powell, Charles L., II; Gurrola, Larry D.; Selting, Amy J.; Brandt, Theodore R.

2002-01-01

311

Typhus and typhuslike rickettsiae associated with opossums and their fleas in Los Angeles County, California.  

PubMed Central

The recent discovery of cat fleas (Ctenocephalides felis) infected with a typhuslike rickettsia (designated the ELB agent) raises the question of whether similar rickettsial infections exist in wild cat flea populations. We verified the presence of the ELB agent and Rickettsia typhi in urban and suburban areas of Los Angeles, Calif. Opossums trapped in close proximity to the residences of human murine typhus cases in Los Angeles county and other areas within the city of Los Angeles were tested for the presence of typhus group rickettsiae by the polymerase chain reaction (PCR). The presence of rickettsiae in the spleen tissues of three opossums (n = 9) and in 66 opossum fleas (n = 205) was determined by PCR and was verified by dot blot and Southern transfer hybridization. Further analysis of the amplified PCR products generated by a series of primer pairs derived from either the 17-kDa antigen gene or the citrate synthase gene revealed that both R. typhi and the ELB agent were present in the tested samples. Dual infection was not noted in the samples; however, the fleas were infected with either R. typhi or the ELB agent. The presence of the ELB agent in the cat flea population may have implications for public health. Whether this agent is responsible for the mild cases of human murine typhus in urban and suburban areas of Los Angeles or in other endemic foci remains to be determined. Images PMID:1629332

Williams, S G; Sacci, J B; Schriefer, M E; Andersen, E M; Fujioka, K K; Sorvillo, F J; Barr, A R; Azad, A F

1992-01-01

312

A water-quality monitoring network for Vallecitos Valley, Alameda County, California  

USGS Publications Warehouse

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)

Farrar, C. D.

1980-01-01

313

Chromium geochemistry of serpentinous sediment in the Willow core, Santa Clara County, California  

USGS Publications Warehouse

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.

Oze, Christopher J.; LaForce, Matthew J.; Wentworth, Carl M.; Hanson, Randall T.; Bird, Dennis K.; Coleman, Robert G.

2003-01-01

314

Final Report: Natural State Models of The Geysers Geothermal System, Sonoma County, California  

SciTech Connect

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.

T. H. Brikowski; D. L. Norton; D. D. Blackwell

2001-12-31

315

Artificial recharge in the Waterman Canyon-East Twin Creek area, San Bernardino County, California  

USGS Publications Warehouse

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.

Warner, J. W.; Moreland, J. A.

1973-01-01

316

Hydrologic data, 1974-77, Stovepipe Wells Hotel area, Death Valley National Monument, Inyo County, California  

USGS Publications Warehouse

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)

Lamb, Charles Edwin; Downing, D.J.

1979-01-01

317

Hydrologic and geochemical monitoring in Long Valley Caldera, Mono County, California, 1982-1984  

USGS Publications Warehouse

The Long Valley caldera is a potentially active volcanic area on the eastern side of the Sierra Nevada in east-central California. Hydrologic and geochemical monitoring of surface and subsurface features began in July 1982 to determine if changes were occurring in response to processes causing earthquakes and crustal deformation. Differences since 1982 in fluid chemistry of springs has been minor except at Casa Diablo, where rapid fluctuations in chemistry result from near surface boiling and mixing. Ratios of 3-He/4-He and 13-C/12-C in hot springs and fumaroles are consistent with a magnetic source for some of the carbon and helium discharged in thermal areas, and observed changes in 3-He/4-He between 1978 and 1984 suggest changes in the magmatic component. Significant fluctuations in hot spring discharge recorded at several sites since 1982 closely followed earthquake activity. Water levels in wells have been used as strain meters to detect rock deformation associated with magmatic and tectonic activity and to construct a water table contour map. Coseismic water level fluctuations of as much as 0.6 ft have been observed but no clear evidence of deformation caused by magmatic intrusions can be seen in the well records through 1984. Temperature profiles in wells, which can be used to delineate regionally continuous zones of lateral flow of hot water across parts of the caldera, have remained constant at all but two sites. (Author 's abstract)

Farrar, C. D.; Sorey, M. L.; Rojstaczer, S.; Janik, C. J.; Mariner, R. H.; Winnett, T. L.; Clark, M. D.

1985-01-01

318

Management by assertion: beavers and songbirds at Lake Skinner (Riverside County, California).  

PubMed

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

Longcore, Travis; Rich, Catherine; Müller-Schwarze, Dietland

2007-04-01

319

Comments on potential geologic and seismic hazards affecting Mare Island, Solano County, California  

USGS Publications Warehouse

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.

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

320

Geohydrology and mathematical simulation of the Pajaro Valley aquifer system, Santa Cruz and Monterey counties, California  

USGS Publications Warehouse

Groundwater development has resulted in lowered water levels and seawater intrusion in the Pajaro Valley, California. An investigation was undertaken to describe the geohydrology of the groundwater flow system and to evaluate the response of the system to pumping stresses by using a mathematical model. The aquifer system consists of three aquifers. The lower aquifer is in fluvial sequences of Quaternary Aromas Sand below interbedded clay layers. The middle aquifer is in upper fluvial and lower eolian sequence of Aromas Sand, and in overlying basal gravels in terrace deposits and alluvium. Weathered soil zones in the Aromas Sand, and clay layers in the terrace deposits and alluvium overlie the middle aquifer. The upper aquifer is actually many discontinuous water bearing zones in the Aromas Sand, terrace deposits, alluvium, and dune sand. The three aquifers are represented in the mathematical model by three model layers separated by two confining layers. Model-generated water budgets for the 11-year simulation period show that storage decreased by 23,000 acre-ft, mostly during the 1976-77 drought. The calibrated model can simulate, with acceptable accuracy, both semiannual and long-term trends of potentiometric heads in parts of the lower and middle layers. (USGS)

Johnson, M. J.; Londquist, C. J.; Laudon, Julie; Mitten, H. T.

1988-01-01

321

Preliminary report on part of the Oat Hill quicksilver mine, Mayacmas district, Napa County, California  

USGS Publications Warehouse

Oat Hill quicksilver mine, located in the Mayacmas district of northern California, and credited with having produced more than 160,000 flasks of quicksilver, was sampled cooperatively by the Buray of Mines and Geological Survey during 1944. 28 diamond drill holes totaling 8,120 feet were drilled by the Bureau of Mines in four of the six principal veins to sample virgin low-grade reserves and stope fill, and reserves in the other two veins were estimated from existing underground workings and by inferences from drill holes in nearby veins. The writer estimates a total of 10,220 flasks of quicksilver in indicated and inferred reserves totaling 320,000 tons. Indicated reserves minable under 1943 conditions are estimated at 1,960 flasks of quicksilver in 75,000 tons averaging 3.0 lbs Hg per ton. Inferred reserves minable under 1943 conditions are estimated at 4,640 flasks of quicksilver in 109,920 tons averaging about 3.2 lbs Hg per ton. Inferred reserves believed minable only under economic conditions much more favorable than even those of 1943 are estimated at 2,620 flasks of quicksilver in 135,080 tons averaging a little less than 1.5 lbs Hg per ton. About two-thirds of the indicated reserves are accessible in underground workings. All other reserves are estimated approximately without access underground. Several areas not sampled may possibly contain reserves.

Fix, Philip Forsyth

1955-01-01

322

Residential proximity to traffic and adverse birth outcomes in Los Angeles county, California, 1994-1996.  

PubMed

We reported previously that increases in ambient air pollution in the Los Angeles basin increased the risk of low weight and premature birth. However, ambient concentrations measured at monitoring stations may not take into account differential exposure to pollutants found in elevated concentrations near heavy-traffic roadways. Therefore, we used an epidemiologic case-control study design to examine whether residential proximity to heavy-traffic roadways influenced the occurrence of low birth weight (LBW) and/or preterm birth in Los Angeles County between 1994 and 1996. We mapped subject home locations at birth and estimated exposure to traffic-related air pollution using a distance-weighted traffic density (DWTD) measure. This measure takes into account residential proximity to and level of traffic on roadways surrounding homes. We calculated odds ratios (ORs) and risk ratios (RRs) for being LBW and/or preterm per quintile of DWTD. The clearest exposure-response pattern was observed for preterm birth, with an RR of 1.08 [95% confidence interval (CI), 1.01-1.15] for infants in the highest DWTD quintile. Although higher risks were observed for LBW infants, exposure-response relations were less consistent. Examining the influence of season, we found elevated risks primarily for women whose third trimester fell during fall/winter months (OR(term LBW) = 1.39; 95% CI, 1.16-1.67; OR(preterm and LBW) = 1.24; 95% CI = 1.03-1.48; RR(all preterm) = 1.15; 95% CI, 1.05-1.26), and exposure-response relations were stronger for all outcomes. This result is consistent with elevated pollution in proximity to sources during more stagnant air conditions present in winter months. Our previous research and these latest results suggest exposure to traffic-related pollutants may be important. PMID:12573907

Wilhelm, Michelle; Ritz, Beate

2003-02-01

323

Health of resettled Iraqi refugees --- San Diego County, California, October 2007-September 2009.  

PubMed

In recent years, Iraqi refugees have been resettling in the United States in large numbers, with approximately 28,000 arrivals during October 2007-September 2009 (federal fiscal years [FYs] 2008 and 2009). All refugees undergo a required medical examination before departure to the United States to prevent importation of communicable diseases, including active tuberculosis (TB), as prescribed by CDC Technical Instructions. CDC also recommends that refugees receive a more comprehensive medical assessment after arrival, which typically occurs within the first 90 days of arrival. To describe the health profile of resettled Iraqi refugees, post-arrival medical assessment data were reviewed for 5,100 Iraqi refugees who underwent full or partial assessments at the San Diego County refugee health clinic during FYs 2008 and 2009. Among 4,923 screened refugees aged >1 year, 692 (14.1%) had latent tuberculosis infection (LTBI); among 3,047 screened adult refugees aged >18 years, 751 (24.6%) were classified as obese; and among 2,704 screened adult refugees, 410 (15.2%) were hypertensive. Although infectious illness has been the traditional focus of refugee medical screening, a high prevalence of chronic, noninfectious conditions that could lead to serious morbidity was observed among Iraqi refugees. Public health agencies should be aware of the potentially diverse health profiles of resettling refugee groups. Medical assessment of arriving refugee populations, with timely collection and review of health data, enables early detection, treatment, and follow-up of conditions, and can help public health agencies develop and set priorities for population-specific health interventions and guidelines. PMID:21160458

2010-12-17

324

A data viewer for stream-sediment and surface-water chemistry, geology, and geography of the Humboldt River basin, northern Nevada. Chapter F.  

USGS Publications Warehouse

The data and software utilized in this product 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.

Yager, Douglas B.; Folger, Helen W.; edited by Stillings, Lisa L.

2006-01-01

325

Geohydrologic reconnaissance of the Soquel-Aptos are, Santa Cruz County, California  

USGS Publications Warehouse

This report summarizes existing knowledge on the geohydrology of the Soquel-Aptos area, near, and including the eastern part, of Santa Cruz, California, and outlines work necessary for making a complete appraisal of the water resources of the area. The area is underlain mostly by marine and continental sedimentary deposits of Tertiary and Quaternary age. A small section in the northeastern part of the area on the eastern side of the San Andreas fault is underlain by sedimentary and metamorphic rocks of Cretaceous or older age. Quartz diorite, probably of Cretaceous age, underlies a considerable part of the area, but crops out only in small exposures along canyon bottom south of the Zayante fault. The Soquel-Aptos area consists of two main structural blocks?one, downthrown on the northeast side of the Zayante fault; the other, upthrown on the southwest side of the fault. The main water-bearing formations in the southwestern structural block are the Santa Margarita and Purisima Formations. The Purisima, the most widespread of these units in this area, contains water under water-table and artesian conditions and furnishes water to most wells. The water-bearing character of the rocks in the northern structural block is unknown. Presently available geohydrologic data are too limited for detailed evaluation of the ground-water potential in the Soquel-Aptos area. Work needed for a detailed evaluation includes: (1) Geophysical exploration and test drilling at selected locations, (2) pumping tests of selected existing wells and possibly of specially drilled test wells, (3) study and reconnaissance measurements of spring and streamflow, (4) chemical analysis of water samples from selected wells, and (5) establishment of a program for monitoring water quality and water levels in key wells.

Akers, J.P.; Hickey, J.J.

1967-01-01

326

Structural investigations at the Coso geothermal area using remote sensing information, Inyo County, California  

SciTech Connect

Remote sensing studies have been made in and adjacent to the Coso geothermal field using TM FCC satellite imagery, 1:100,000 scale, US Geological Survey orthophotos, 1:24,OOO scale, and proprietary black-and-white photography by California Energy Company, Inc., at various scales including black-and-white positive film transparencies at a scale of 1:6,000. These studies have been made in an attempt to understand the complex geology seen on the surface and to try to improve the method of locating geothermal wells. The tectonic history indicated by remote sensing, gravity, magnetic, refraction and reflection seismic studies indicates structure caused by a period of thrusting and folding followed by local and regional slumping and collapse, which is continuing today. During Sevier/Laramide orogeny, the Sierra Nevada Mountains were thrust eastward over Rose Valley/lndian Wells Valley. Relatively thin granitic/metamorphic plates were folded to form the Coso Range and thrust eastward over Coso Wash. In turn, the Argus Range to the east was thrust eastward over Panamint Valley. As soon as topographic relief, developed by the thrusting, was high enough, the entire area started to collapse, in some cases using the original thrust planes for slumping. The granitic/metamorphic rocks forming the surface of the Coso Range anticline slumped eastward into Coso Wash and westward toward Rose Valley. The Sierra front slumped eastward into Rose Valley/Indian Wells Valley, and the entire range may have had westward on the original thrust faults. The thin basalts on the east side of Coso Wash slumped westward into Coso Wash. Several basaltic eruptions of 3-4 million years ago used the zone between slump blocks as eruption sites. Regional slumping for the entire area toward the southeast is indicated on satellite imagery.

Austin, W.H. (Austin Enterprises, Santa Rose, CA (USA))

1990-05-01

327

Geologic and Geophysical Framework of the Santa Rosa 7.5' Quadrangle, Sonoma County, California  

USGS Publications Warehouse

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 Rincon, Bennett, and northwestern Sonoma Valleys, providing geohydrologists a more realistic framework for groundwater flow models.

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

328

Review of Vedder pool development, Kern River field, Kern County, California  

SciTech Connect

The Kern River field is located on the east side of the San Joaquin Valley, just north of Bakersfield, California. Since its discovery in 1899, the field has produced over 1 billion bbl of heavy oil from the Kern River Formation. It was not until 1981 that light oil was discovered from a deeper zone, the Vedder formation. The discovery well, Getty Oil Company WD-1 Apollo, encountered 40 ft of net oil sand within the third Vedder sand and was completed on pump for an initial production of 100 bbl of 40.5/sup 0/ API oil and 200 MCDGD. As suggested by its name, WD-1 Apollo was drilled as a water-water injection wells. However, a detailed subsurface study of the field suggested the possibility of a trap within the Vedder formation. The originally proposed location of WD-1 Apollo was then moved to test the proposal. The trap is a series of intersecting, up-to-the-basin normal faults trending west and northwest. These faults have dropped impermeable silty zones within the Vedder formation against the productive Vedder sands. Since the completion of WD-1 Apollo, nine other wells have been drilled within this pool, extending production over 1 mi to the southeast. One of the first of the extension wells, Getty Oil Company 73X Central Point, located approximately 600 ft southeast of WD-1 Apollo, established production from the second Vedder sand. This well was completed flowing 300 b/d of 32/sup 0/ API oil and 1000 MCFGD through a 16/64-in. choke. Through December 1985, Texaco (Getty Oil) produced more than 250,000 bbl of oil and 350,000 mcf of gas combined from the second and third Vedder sands from 2.5 net wells. Although attempts to find other such Vedder pools have met with limited success, there is still the potential for many to exist, given proper structural closure, as seen in the Apollo pool.

Condon, M.W.

1986-07-01

329

A Potential Paleotsunami Shell-Hash layer from the Los Penasquitos Marsh, San Diego County, California  

NASA Astrophysics Data System (ADS)

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 marine reservoir) on shell fragments cluster between 1720-1850 cal yrs BP.

Rhodes, B. P.; Cordova, J.; Kirby, M. E.; Leeper, R. J.; Bonuso, N.

2013-12-01

330

Distribution of nitrate in the unsaturated zone, Highland-East Highlands area, San Bernardino County, California  

USGS Publications Warehouse

Nitrogen in the unsaturated soil zone in the Highland-East Highlands area of San Bernardino County, Calif., has been suspected as the source of nitrate in water from wells. Plans to recharge the local aquifers with imported surface water would raise the water table and intercept that nitrogen. This study was made to describe the distribution of inorganic nitrogen and other chemical constituents and nitrogen-using bacteria in the unsaturated zone, to relate nitrogen occurrences, in a general way, to present and historical land use, and to attempt to predict nitrogen concentrations in ground water after recharge. Some generalized correlations between nitrogen occurrence and land use were observed. In 11 of 13 test holes, the maximum nitrate-nitrogen (NO3--N) concentrations occurred within 10 feet of the surface, suggesting that the major source of nitrogen is from the surface at these sites. Test holes were ranked according to maximum NO3--N in the top 10 feet, total NO3--N in the top 10 feet, and total NO3--N in the top 40 feet. In all three rankings, the top seven test holes were the same--five in or near present or historical agricultural areas (primarily citrus groves), one in a feedlot, and one adjacent to an abandoned sewage-treatment plant. Two test holes in historically uninhabited areas ranked lowest. The control test hole in an uninhabited area ranked high in geometric mean of ammonium-nitrogen concentration (NH4+-N), suggesting that present in freshly weathered granite. The geometric means of NH4+-N concentrations in six of eight citrus-related test holes were significantly lower than in the control hole, suggesting that irrigation in citrus groves may have created conditions favoring nitrification of the primary NH4+-N. Rank correlation analyses between various measurements in test holes showed that high NO3--N concentrations tend to occur with high specific conductance and chloride concentrations in soil extracts. If recharge is carried out as planned, assuming complete mixing of the recharge water and interstitial pore water in the top 20 feet of the saturated zone, NO3--N concentrations in water at the top of the saturated zone may exceed 10 milligrams per liter in seven areas studied. Concentrations could reach as high as 66 milligrams per liter in the worst case projected. The highest concentrations may be found in three areas that are now, or were recently, citrus groves.

Klein, John M.; Bradford, Wesley L.

1980-01-01

331

78 FR 59073 - Pacific Gas and Electric Company; Humboldt Bay Independent Spent Fuel Storage Installation...  

Federal Register 2010, 2011, 2012, 2013

...Humboldt Bay Independent Spent Fuel Storage Installation; Amendment to Materials...Humboldt Bay (HB) independent spent fuel storage installation (ISFSI). ADDRESSES: Please...receipt, possession, transfer, and storage of spent fuel and associated...

2013-09-25

332

Shallow Structure of the Eagle Rock and Raymond Faults in Arroyo Seco, Los Angeles County, California  

NASA Astrophysics Data System (ADS)

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, indicating that physical property contrasts extend significantly deeper than was imaged by the refraction tomography seismic survey. At a broader scale, we modeled aeromagnetic anomalies along a 40-km-long north-south profile across the Eagle Rock, Raymond, and neighboring faults. The clearest aeromagnetic anomaly is associated with the Eagle Rock fault, where our modeling constrains its dip to be ~60° to the north in at least the uppermost 5 km of the crust.

Scheirer, D. S.; Rymer, M. J.; Catchings, R. D.; Goldman, M.; Fuis, G.

2012-12-01

333

Appraisal of ground-water resources in the San Antonio Creek Valley, Santa Barbara County, California  

USGS Publications Warehouse

A nearly threefold increase in demand for water in the 154-square-mile San Antonio Creek valley in California during the period 1958-77 has increased the potential for overdraft on the ground-water basin. The hydrologic budget for this period showed a perennial yield of about 9,800 acre-feet per year and an annual ground-water discharge of about 11,400 acre-feet per year, comprising net pumpage of 7,100 acre-feet, phreatophyte evapotranspiration of 3,000 acre-feet, and base streamflow of 1 ,300 acre-feet. The base flow in San Antonio Creek could diminish to zero when net pumpage reaches 13,500 acre-feet per year. The environmentally sensitive marshland area of Barka Slough may then become stressed as water normally lost through evapotranspiration is captured by pumpage. The aquifer consists of alluvial valley fill that ranges in thickness from 0 to 3,500 feet. Ground water moves seaward from recharge areas along mountain fronts to a consolidated rock barrier about 5 miles east of the Pacific coast. Upwelling of ground water just east of the barrier has resulted in the 550-acre Barka Slough. Transmissivity of the aquifer ranges from 2,600 to 34,000 feet squared per day, with the lowest values occurring in the central part of the valley where the aquifer is thickest but probably finer grained. The salinity problems are increasing in the agricultural parts of the valley, which is east of the barrier. West of the barrier, stream and ground-water quality is poor, owing to seepage of saline water from the marine shale that underlies the area at shallow depths. A proposed basinwide monitoring program includes 17 water-level sites, 12 water-quality sampling sites, 3 streamflow measuring sites, and periodic infrared aerial photography of Barka Slough. A computer model of the ground-water flow system could be developed to assess the impact of various water-management alternatives. (USGS)

Hutchinson, C.B.

1980-01-01

334

Arsenic speciation in pyrite and secondary weathering phases, Mother Lode gold district, Tuolumne County, California  

SciTech Connect

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 mobility and bioavailability by desorption or dissolution. Both the substrate minerals and dissolved As species are expected to respond to seasonal changes in lake chemistry caused by thermal stratification and turnover within the monomictic Don Pedro Reservoir. Arsenic is predicted to be most bioavailable and toxic in the reservoir's summer hypolimnion.

Savage, K.S.; Tingle, Tracy N.; O'Day, Peggy A.; Waychunas, Glenn A.; Bird, Dennis K.

2004-10-27

335

Arsenic speciation in pyrite and secondary weathering phases, Mother Lode gold district, Tuolumne County, California  

SciTech Connect

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 mobility and bioavailability by desorption or dissolution. Both the substrate minerals and dissolved As species are expected to respond to seasonal changes in lake chemistry caused by thermal stratification and turnover within the monomictic Don Pedro Reservoir. Arsenic is predicted to be most bioavailable and toxic in the reservoir's summer hypolimnion.

Savage, K.S.; Tingle, Tracy N.; O'Day, Peggy A.; Waychunas, Glenn A.; Bird, Dennis K.

2004-10-27

336

Ground-water resources of the Yucca Valley-Joshua Tree area, San Bernardino County, California  

USGS Publications Warehouse

The southeastern part of the Mojave Water Agency area included in this report comprises about 600 square miles. Recharge into the area is almost exclusively from precipitation in the San Bernardino and Little San Bernardino Mountains. About 500 acre-feet per year of recharge enters the western part of the area as underflow through Pipes Wash. Little direct recharge occurs as a result of precipitation directly on the unconsolidated deposits. Presently about 11,000 persons reside in the area and current gross pumpage is about 1,600 acre-feet annually. By the year 2000 the population is estimated to be 62,000 and annual gross pumpage is expected to be nearly 11,000 acre-feet. Although over 1,200,000 acre-feet of ground water are presently in storage, most of the population is centered in the southern part of the area around the towns of Yucca Valley and Joshua Tree. About 70 percent of the population resides in the vicinity of Yucca Valley and is supplied by ground water pumped from the Warren Valley basin. Of the 96,000 acre-feet of ground water in storage in that basin in 1969, about 80,000 acre-feet will be necessary to sustain projected growth there until 2000. Assuming negligible recharge and only about 50 percent recovery of the ground water in storage, if imported water from northern California is not available before about 1990, additional local supplies will have to be developed, possibly in the adjacent Pipes subbasin to the north. Ground water in the southern part of the study area generally contains less than 250 mg/l (milligrams per liter) dissolved solids and 1.0 mg/l fluoride. A general degradation of ground-water quality occurs northward toward the dry lakes where the concentrations of dissolved solids and fluoride approach 2,000 and 5.0 mg/l, respectively. In Reche subbasin some isolated occurrences of fluoride exceeding 1.5 mg/l were noted. The chemical character of ground water in Johnson Valley and Morongo Valley basins differs from well to well and, in general, water from these basins is less desirable for use.

Lewis, R. E.

1972-01-01

337

Characterization of the hydrologic and transport properties of the shallow aquifer under Kesterson Reservoir, Merced County, California  

SciTech Connect

A detailed investigation of hydrologic and transport properties of the shallow aquifer underlying the selenium-contaminated Kesterson Reservoir, Merced County, California has been carried out. The aquifer is composed of a sequence of sands, silts, and clays deposited on the flood plain of the San Joaquin River. Transport properties were evaluated by two multiple well tracer experiments. A new method for interpreting observation well data from a two-well recirculating tracer test in the presence of multiple flow paths was developed and applied to these experiments. The model explicitly includes the effects of the sampling device (the well) on the shape of the tracer breakthrough curves. The model was used to interpret both non-reactive and reactive transport. Non-reactive tracer experiments were used to evaluate mesoscale heterogeneity of the aquifer. Experiments indicate that the tracer traveled from the injection well to the observation wells along discrete flow paths and within each flow path dispersion was controlled by pore-level mixing. The thickness of the individual flow paths averaged 0.28 m and dispersivity values for travel distances of 15 m averaged 0.03 m. Overall, dispersion of the tracer pulse was most strongly affected by the wide range of advection rates along the many flow paths intersecting each monitoring well. Velocities along comparable flow paths ranged over an order of magnitude within a 6.1 m-thick interval of the sandy aquifer. By repeating the same experiment with the flow field rotated 90{degree} with respect to the first experiment, it was shown that many of the layers are not continuous and/or do not have uniform hydrologic properties over lateral distances of more than 15 m. Rates of denitrification and selenium immobilization were also measured in these tracer experiments.

Benson, S.M.

1988-01-01

338

Distribution of the endangered giant kangaroo rat, Dipodomys ingens, on the Naval Petroleum Reserves, Kern County, California  

SciTech Connect

Field surveys were conducted to determine the distribution and relative abundance of burrow systems of the endangered giant kangaroo rat, Dipodomys ingens, on the US Department of Energy's Naval Petroleum Reserves (NPR-1, NPR-2) in Kern County, California. A total of 1080 burrow systems were observed on 30 sections of NPR-1, 22 sections of NPR-2, and six adjoining sections. Most burrow systems were found in clusters on deep sandy loams in Buena Vista Valley, but isolated burrows were found in similar soils on the upper slopes or crests of ridges in 30 other sections of the reserves. Burrow systems had an average of 3.3 horizontal entrances measuring 2.7 in. high and 3.4 in. wide, and an average of 1.4 vertical entrances 2.0 in. in diameter. In the valleys burrows occurred in a density of 28.2 per acre; had an average slope angle of 4.3/sup 0/; were within 3.3 yd of a perennial shrub, usually a cheese-bush, Hymenoclea salsola; had a predominantly southern aspect; and were grazed by sheep, but were remote from petroleum production activities. In the uplands burrows occurred in a density of 0.1 per acre; had an average slope angle of 6.4/sup 0/; were within 5.1 yd of a perennial shrub, usually a desert saltbush, Atriplex polycarpa; had no particular aspect; and were not grazed by sheep, but were close to petroleum production activities. Since 1980, preconstruction surveys have helped conserve giant kangaroo rat burrows that may have been inadvertently threatened by construction projects on the reserves.

O'Farrell, T.P.; Mathews, N.E.; Kato, T.T.; McCue, P.M.; McManus, J.S.; Sauls, M.L.

1987-07-01

339

Sediment accumulation in San Leandro Bay, Alameda County, California, during the 20th century : a preliminary report  

USGS Publications Warehouse

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. Opening of the Oakland tidal channel and removal of 97% of the marshlands formerly surrounding the Bay have decreased tidal velocities and volumes. Marshland removal has decreased the tidal prism by about 25%. 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 required 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. (Author 's abstract)

Nolan, K.M.; Fuller, C.C.

1986-01-01

340

Evaluation of the potential for artificial ground-water recharge in eastern San Joaquin County, California; Phase 3  

USGS Publications Warehouse

Infiltration tests were used to evaluate the potential of basin spreading surface water as a means of artificially recharging the aquifer system in eastern San Joaquin County, California. Two infiltration sites near Lockeford and Linden were selected on the basis of information collected during the first two phases of the study. Data from the infiltration tests indicate that the two sites are acceptable for recharge by the basin-spreading method. Infiltration rates ranged between 6.7 and 10.5 ft/day near Lockeford and between 2.6 and 11.2 ft/day near Linden. Interpretation of these data is limited by lack of information on the response of the saturated zone during testing and by the inherent difficulty in extrapolating the results of small-scale tests to larger long-term operations. Lithology is a major factor that controls infiltration rates at the test sites. The unsaturated zone is characterized by heterogeneous layers of coarse- and fine- grained materials. Clay layers of low hydraulic conductivity commonly form discontinuous lenses that may cause a transient perched water table to develop during recharge. Water level measurements from wells screened in the unsaturated zone indicate that the perched water table could reach the land surface after 2 and 5 months of recharge near Lockeford and Linden, respectively. These figures probably represent the minimum time necessary for saturation of the land. Another major factor that affects infiltration rates is the quality of the recharge water, particularly the suspended sediment content. The clogging action of suspended sediment may be minimized by: (1) pretreatment of recharge water in a settling pond, (2) adherence to a routine program of monitoring and maintenance, and (3) proper design of the recharge facility. Other factors that affect infiltration rates include basin excavation technique, basin shape, and maintenance procedures. Efficient operation of the recharge facility requires careful attention to the relation between subsurface water levels and infiltration rates. (Author 's abstract)

Hamlin, S. N.

1987-01-01

341

Statistical analysis and mathematical modeling of a tracer test on the Santa Clara River, Ventura County, California  

USGS Publications Warehouse

To better understand flow processes, solute-transport processes, and ground-water/surface-water interactions on the Santa Clara River in Ventura County, California, a 24-hour fluorescent-dye tracer study was performed under steady-state flow conditions on a 28-mile reach of the river. The study reach includes perennial (uppermost and lowermost) subreaches and ephemeral subreaches of the lower Piru Creek and the middle Santa Clara River. Dye was injected at a site on Piru Creek, and fluorescence of river water was measured continuously at four sites and intermittently at two sites. Discharge measurements were also made at the six sites. The time of travel of the dye, peak dye concentration, and time-variance of time-concentration curves were obtained at each site. The long tails of the time-concentration curves are indicative of sources/sinks within the river, such as riffles and pools, or transient bank storage. A statistical analysis of the data indicates that, in general, the transport characteristics follow Fickian theory. These data and previously collected discharge data were used to calibrate a one-dimensional flow model (DAFLOW) and a solute-transport model (BLTM). DAFLOW solves a simplified form of the diffusion-wave equation and uses empirical relations between flow rate and cross-sectional area, and flow rate and channel width. BLTM uses the velocity data from DAFLOW and solves the advection-dispersion transport equation, including first-order decay. The simulations of dye transport indicated that (1) ground-water recharge explains the loss of dye mass in the middle, ephemeral, subreaches, and (2) ground-water recharge does not explain the loss of dye mass in the uppermost and lowermost, perennial, subreaches. This loss of mass was simulated using a linear decay term. The loss of mass in the perennial subreaches may be caused by a combination of photodecay or adsorption/desorption.

Paybins, Katherine S.; Nishikawa, Tracy; Izbicki, John A.; Reichard, Eric G.

1998-01-01

342

Epizootiological features of avian cholera on the north coast of California.  

PubMed

An avian cholera (Pasteurella multocida) epizootic was observed among wildfowl at the Centerville Gun Club, Humboldt County, California (USA) in January 1978. Compared to their live populations and use of the area, coots (Fulica americana) died in proportionately greater numbers than any other species. Coots collected by gunshot were evaluated for sex and age composition, and morphometry from November 1977 through mid-January 1978 at this site. There was no substantial difference in the sex, age or morphometry between birds dying of avian cholera and from those dying from gunshot. Assuming coots dying of gunshot are representative of the general population, it appears there was little selection among coots by P. multocida. There was evidence for a sequential mortality similar to that reported previously at this site: coots were the first birds to die, followed by American wigeon (Anas americana) and northern pintails (A. acuta acuta); northern shovelers (A. clypeata) and mallards (A. platyrhynchos) died late in the epizootic. PMID:2716104

Mensik, J G; Botzler, R G

1989-04-01

343

78 FR 36823 - California High-Speed Rail Authority-Construction Exemption-in Merced, Madera and Fresno Counties...  

Federal Register 2010, 2011, 2012, 2013

...Docket No. FD 35724] California High-Speed Rail Authority--Construction Exemption...C. 10901 for the California High-Speed Rail Authority (Authority) to construct an approximately 65- mile high-speed passenger rail line between Merced...

2013-06-19

344

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

Federal Register 2010, 2011, 2012, 2013

...Docket No. FD 35724] California High-Speed Rail Authority--Construction Exemption...On March 27, 2013, California High-Speed Rail Authority (Authority), a noncarrier...approximately 65-mile dedicated high-speed passenger rail line between Merced...

2013-04-24

345

Assessing potential effects of changes in water use with a numerical groundwater-flow model of Carson Valley, Douglas County, Nevada, and Alpine County, California  

USGS Publications Warehouse

Rapid growth and development within Carson Valley in Douglas County, Nevada, and Alpine County, California, has caused concern over the continued availability of groundwater, and whether the increased municipal demand could either impact the availability of water or result in decreased flow in the Carson River. Annual pumpage of groundwater has increased from less than 10,000 acre feet per year (acre-ft/yr) in the 1970s to about 31,000 acre-ft/yr in 2004, with most of the water used in agriculture. Municipal use of groundwater totaled about 10,000 acre-feet in 2000. In comparison, average streamflow entering the valley from 1940 to 2006 was 344,100 acre-ft/yr, while average flow exiting the valley was 297,400 acre-ft/yr. Carson Valley is underlain by semi-consolidated Tertiary sediments that are exposed on the eastern side and dip westward. Quaternary fluvial and alluvial deposits overlie the Tertiary sediments in the center and western side of the valley. The hydrology of Carson Valley is dominated by the Carson River, which supplies irrigation water for about 39,000 acres of farmland and maintains the water table less than 5 feet (ft) beneath much of the valley floor. Perennial and ephemeral watersheds drain the Carson Range and the Pine Nut Mountains, and mountain-front recharge to the groundwater system from these watersheds is estimated to average 36,000 acre-ft/yr. Groundwater in Carson Valley flows toward the Carson River and north toward the outlet of the Carson Valley. An upward hydraulic gradient exists over much of the valley, and artesian wells flow at land surface in some areas. Water levels declined as much as 15 ft since 1980 in some areas on the eastern side of the valley. Median estimated transmissivities of Quaternary alluvial-fan and fluvial sediments, and Tertiary sediments are 316; 3,120; and 110 feet squared per day (ft2/d), respectively, with larger transmissivity values in the central part of the valley and smaller values near the valley margins. A groundwater-flow model of Quaternary and Tertiary sediments in Carson Valley was developed using MODFLOW and calibrated to simulate historical conditions from water years 1971 through 2005. The 35-year transient simulation represented quarterly changes in precipitation, streamflow, pumping and irrigation. Inflows to the groundwater system simulated in the model include mountain-front recharge from watersheds in the Carson Range and Pine Nut Mountains, valley recharge from precipitation and land application of wastewater, agricultural recharge from irrigation, and septic-tank discharge. Outflows from the groundwater system simulated in the model include evapotranspiration from the water table and groundwater withdrawals for municipal, domestic, irrigation and other water supplies. The exchange of water between groundwater, the Carson River, and the irrigation system was represented with a version of the Streamflow Routing (SFR) package that was modified to apply diversions from the irrigation network to irrigated areas as recharge. The groundwater-flow model was calibrated through nonlinear regression with UCODE to measured water levels and streamflow to estimate values of hydraulic conductivity, recharge and streambed hydraulic-conductivity that were represented by 18 optimized parameters. The aquifer system was simulated as confined to facilitate numerical convergence, and the hydraulic conductivity of the top active model layers that intersect the water table was multiplied by a factor to account for partial saturation. Storage values representative of specific yield were specified in parts of model layers where unconfined conditions are assumed to occur. The median transmissivity (T) values (11,000 and 800 ft2/d for the fluvial and alluvial-fan sediments, respectively) are both within the third quartile of T values estimated from specific-capacity data, but T values for Tertiary sediments are larger than the third quartile estimated from specific-capacity data. The estimated vertical anisotropy for the Quaternary fluvial sediments (9,000) is comparab

Yager, Richard M.; Maurer, Douglas K.; Mayers, C.J.

2012-01-01

346

Geohydrology of deep-aquifer system monitoring-well site at Marina, Monterey County, California  

USGS Publications Warehouse

In 2000, a deep-aquifer system monitoring-well site (DMW1) was completed at Marina, California to provide basic geologic and hydrologic information about the deep-aquifer system in the coastal region of the Salinas Valley. The monitoring-well site contains four wells in a single borehole; one completed from 930 to 950 feet below land surface (bls) in the Paso Robles Formation (DMW1-4); one 1,040 to 1,060 feet below land surface in the upper Purisima Formation (DMW1-3); one from 1,410 to 1,430 feet below land surface in the middle Purisima Formation (DMW1-2); and one from 1,820 to 1,860 feet below land surface in the lower Purisima Formation (DMW1-1). The monitoring site is installed between the coast and several deep-aquifer system supply wells in the Marina Coast Water District, and the completion depths are within the zones screened in those supply wells. Sediments below a depth of 955 feet at DMW1 are Pliocene age, whereas the sediments encountered at the water-supply wells are Pleistocene age at an equivalent depth. Water levels are below sea level in DMW1 and the Marina Water District deep-aquifer system supply wells, which indicate that the potential for seawater intrusion exists in the deep-aquifer system. If the aquifers at DMW1 are hydraulically connected with the submarine outcrops in Monterey Bay, then the water levels at the DMW1 site are 8 to 27 feet below the level necessary to prevent seawater intrusion. Numerous thick fine-grained interbeds and confining units in the aquifer systems retard the vertical movement of fresh and saline ground water between aquifers and restrict the movement of seawater to narrow water-bearing zones in the upper-aquifer system.Hydraulic testing of the DMW1 and the Marina Water District supply wells indicates that the tested zones within the deep-aquifer system are transmissive water-bearing units with hydraulic conductivities ranging from 2 to 14.5 feet per day. The hydraulic properties of the supply wells and monitoring wells are similar, even though the wells are completed in different geologic formations.Geophysical logs collected at the DMW1 site indicate saline water in most water-bearing zones shallower than 720 feet below land surface and from about 1,025 to 1,130 feet below land surface, and indicate fresher water from about 910 to 950 feet below land surface (DMW1-4), 1,130 to 1,550 feet below land surface, and below 1,650 feet below land surface. Temporal differences between electromagnetic induction logs indicate possible seasonal seawater intrusion in five water-bearing zones from 350 to 675 feet below land surface in the upper-aquifer system.The water-chemistry analyses from the deep-aquifer system monitoring and supply wells indicate that these deep aquifers in the Marina area contain potable water with the exception of the saline water in well DMW1-3. The saline water from well DMW1-3 has a chloride concentration of 10,800 milligrams per liter and dissolved solids concentration of 23,800 milligrams per liter. The source of this water was determined not to be recent seawater based on geochemical indicators and the age of the ground water. The high salinity of this ground water may be related to the dissolution of salts from the saline marine clays that surround the water-bearing zone screened by DMW1-3. The major ion water chemistry of the monitoring wells and the nearby MCWD water-supply wells are similar, which may indicate they are in hydraulic connection, even though the stratigraphic layers differ below 955 feet below land surface.No tritium was detected in samples from the deep monitoring wells. The lack of tritium suggest that there is no recent recharge water (less than 50 years old) in the deep-aquifer system at the DMW1 site. The carbon-14 analyses of these samples indicate ground water from the monitoring site was recharged thousands of years ago.

Hanson, Randall T.; Everett, Rhett R.; Newhouse, Mark W.; Crawford, Steven M.; Pimentel, M. Isabel; Smith, Gregory A.

2002-01-01

347

Individual and County-Level Factors Associated with Use of Multiple Prescribers and Multiple Pharmacies to Obtain Opioid Prescriptions in California  

PubMed Central

Use of multiple prescribers and pharmacies is a means by which some individuals misuse opioids. Community characteristics may be important determinants of the likelihood of this phenomenon independent of individual-level factors. This was a retrospective cohort study with individual-level data derived from California's statewide prescription drug monitoring program (PDMP) and county-level socioeconomic status (SES) data derived from the United States Census. Zero-truncated negative binomial (ZTNB) regression was used to model the association of individual factors (age, gender, drug schedule and drug dose type) and county SES factors (ethnicity, adult educational attainment, median household income, and physician availability) with the number of prescribers and the number of pharmacies that an individual used during a single year (2006). The incidence rates of new prescriber use and new pharmacy use for opioid prescriptions declined across increasing age groups. Males had a lower incidence rate of new prescriber use and new pharmacy use than females. The total number of licensed physicians and surgeons in a county was positively, linearly, and independently associated with the number of prescribers and pharmacies that individuals used for prescription opioids. In summary, younger age, female gender, and living in counties with more licensed physicians and surgeons were associated with use of more prescribers and/or more pharmacies for obtaining prescription opioids. PMID:23049992

Han, Huijun; Kass, Philip H.; Wilsey, Barth L.; Li, Chin-Shang

2012-01-01

348

Review of mineral estate of the United States at Naval Petroleum Reserve No. 2, Buena Vista Hills Field, Kern County, California  

SciTech Connect

The purpose of this report is to present this Consultant`s findings regarding the nature and extent of the mineral estate of the United States at National Petroleum Reserve No. 2 (NPR-2), Buena Vista Hills Field, Kern County, California. Determination of the mineral estate is a necessary prerequisite to this Consultant`s calculation of estimated future cash flows attributable to said estate, which calculations are presented in the accompanying report entitled ``Phase II Final Report, Study of Alternatives for Future Operations of the Naval Petroleum and Oil Shale Reserves, NPR-2, California.`` This Report contains a discussion of the leases in effect at NPR-2 and subsequent contracts affecting such leases. This Report also summarizes discrepancies found between the current royalty calculation procedures utilized at NPR-2 and those procedures required under applicable agreements and regulations. Recommendations for maximizing the government`s income stream at NPR-2 are discussed in the concluding section of this Report.

NONE

1996-08-09

349

Public health assessment for TRW Microwave, Inc. (building 825), Sunnyvale, Santa Clara County, California, Region 9. Cerclis No. CAD009159088. Final report  

SciTech Connect

The TRW Microwave, Inc. Building 825 site, located in Sunnyvale, Santa Clara County, California, was formally listed on the National Priorities List by the U.S. Environmental Protection Agency in February, 1990. At least one of several underground storage tanks apparently leaked volatile organic compounds (VOCs) into the subsurface soils and groundwater. Various variable organic contaminants (VOCs) have been detected in on-site and off-site groundwater at levels of human health concern. The only completed human exposure pathway is from inhalation by off-site residents of volatile organic compounds migrating into homes from shallow groundwater. The pathway was originally proposed based on extrapolations from groundwater concentrations to soil-gas vapors and from soil-gas vapors to indoor air concentrations using mathematical models. Studies conducted by the California Department of Health Services indicate that the contaminated groundwater may contribute to the indoor air quality but not at a level of public health concern.

Not Available

1994-01-10

350

Edoylerite, Hg32+Cr6+O4S2 a new mineral from the Clear Creek claim, San Benito County, California  

USGS Publications Warehouse

Edoylerite is a rare constituent of a small prospect near the long-abandoned Clear Creek mercury mine, New Idria district, San Benito County, California. It is most closely associated with cinnabar, from which it is a primary alteration product, in a host rock composed predominantly of quartz, chalcedony and ferroan magnesite. Edoylerite typically occurs as acicular to stellate crystal groups on and around corroded masses of cinnabar. The mineral is canary yellow to orangish yellow, and possesses a yellow streak and an adamantine luster. The crystallographic, physical and optical properties of edoylerite are described. -after Authors

Erd, R.C.; Roberts, A.C.; Bonardi, M.; Criddle, A.J.; Le, Page Y.; Gabe, E.J.

1993-01-01

351

Debris flows triggered by the El Nino rainstorm of February 2-3, 1998, Walpert Ridge and vicinity, Alameda County, California  

USGS Publications Warehouse

On February 2 and 3, 1998, a rainstorm generated by the 1997-98 El Nino moved through the San Francisco Bay region of California triggering widespread slope failures. In the Walpert Ridge area of Alameda County 531 debris flows were triggered by the storm. These data depict the debris flows and landslides as polygons. The landslide polygons were mapped from 1:30,000 aerial photography using a PG2 photogrammetric plotter. The mapped debris flows and landslides were digitized manually in ArcInfo.

Coe, J. A.; Godt, J. W.

2001-01-01

352

Map showing locations of damaging landslides in Napa County, California, resulting from 1997-98 El Nino rainstorms  

USGS Publications Warehouse

Heavy rainfall associated with a strong El Nino caused over $150 million in landslide damage in the 10-county San Francisco Bay region during the winter and spring of 1998. A team of USGS scientists collected information on landslide locations and damage costs. Napa County was relatively unaffected in comparison to other counties in the region with approximately $1.1 million in damages assessed.

Godt, Jonathan W.; Savage, William Z.; Wilson, Raymond C.

1999-01-01

353

Geohydrological characterization, water-chemistry, and ground-water flow simulation model of the Sonoma Valley area, Sonoma County, California  

USGS Publications Warehouse

The Sonoma Valley, located about 30 miles north of San Francisco, is one of several basins in Sonoma County that use a combination of ground water and water delivered from the Russian River for supply. Over the past 30 years, Sonoma Valley has experienced rapid population growth and land-use changes. In particular, there has been a significant increase in irrigated agriculture, predominantly vineyards. To provide a better understanding of the ground-water/surface-water system in Sonoma Valley, the U.S. Geological Survey compiled and evaluated existing data, collected and analyzed new data, and developed a ground-water flow model to better understand and manage the ground-water system. The new data collected include subsurface lithology, gravity measurements, groundwater levels, streamflow gains and losses, temperature, water chemistry, and stable isotopes. Sonoma Valley is drained by Sonoma Creek, which discharges into San Pablo Bay. The long-term average annual volume of precipitation in the watershed is estimated to be 269,000 acre-feet. Recharge to the ground-water system is primarily from direct precipitation and Sonoma Creek. Discharge from the ground-water system is predominantly outflow to Sonoma Creek, pumpage, and outflow to marshlands and to San Pablo Bay. Geologic units of most importance for groundwater supply are the Quaternary alluvial deposits, the Glen Ellen Formation, the Huichica Formation, and the Sonoma Volcanics. In this report, the ground-water system is divided into three depth-based geohydrologic units: upper (less than 200 feet below land surface), middle (between 200 and 500 feet), and lower (greater than 500 feet). Synoptic streamflow measurements were made along Sonoma Creek and indicate those reaches with statistically significant gains or losses. Changes in ground-water levels in wells were analyzed by comparing historical contour maps with the contour map for 2003. In addition, individual hydrographs were evaluated to assess temporal changes by region. In recent years, pumping depressions have developed southeast of Sonoma and southwest of El Verano. Water-chemistry data for samples collected from 75 wells during 2002-04 indicate that the ground-water quality in the study area generally is acceptable for potable use. The water from some wells, however, contains one or more constituents in excess of the recommended standards for drinking water. The chemical composition of water from creeks, springs, and wells sampled for major ions plot within three groups on a trilinear diagram: mixed-bicarbonate, sodium-mixed anion, and sodium-bicarbonate. An area of saline ground water in the southern part of the Sonoma Valley appears to have shifted since the late 1940s and early 1950s, expanding in one area, but receding in another. Sparse temperature data from wells southwest of the known occurrence of thermal water suggest that thermal water may be present beneath a larger part of the valley than previously thought. Thermal water contains higher concentrations of dissolved minerals than nonthermal waters because mineral solubilities generally increase with temperature. Geohydrologic Characterization, Water-Chemistry, and Ground-Water Flow Simulation Model of the Sonoma Valley Area, Sonoma County, California Oxygen-18 (d18 O) and deuterium (dD) values for water from most wells plot along the global meteoric water line, indicating that recharge primarily is derived from the direct infiltration of precipitation or the infiltration of seepage from creeks. Samples from shallow- and intermediate-depth wells located near Sonoma Creek and (or) in the vicinity of Shellville plot to the right of the global meteoric water line, indicating that these waters are partly evaporated. The d18 O and dD composition of water from sampled wells indicates that water from wells deeper than 200 feet is isotopically lighter (more negative) than water from wells less than 200 feet deep, possibly indicating that older ground wate

Farrar, Christopher D.; Metzger, Loren F.; Nishikawa, Tracy; Koczot, Kathryn M.; Reichard, Eric G.; Langenheim, Victoria E.

2006-01-01

354

Geohydrology, Geochemistry, and Ground-Water Simulation-Optimization of the Central and West Coast Basins, Los Angeles County, California  

USGS Publications Warehouse

Historical ground-water development of the Central and West Coast Basins in Los Angeles County, California through the first half of the 20th century caused large water-level declines and induced seawater intrusion. Because of this, the basins were adjudicated and numerous ground-water management activities were implemented, including increased water spreading, construction of injection barriers, increased delivery of imported water, and increased use of reclaimed water. In order to improve the scientific basis for these water management activities, an extensive data collection program was undertaken, geohydrological and geochemical analyses were conducted, and ground-water flow simulation and optimization models were developed. In this project, extensive hydraulic, geologic, and chemical data were collected from new multiple-well monitoring sites. On the basis of these data and data compiled and collected from existing wells, the regional geohydrologic framework was characterized. For the purposes of modeling, the three-dimensional aquifer system was divided into four aquifer systems?the Recent, Lakewood, Upper San Pedro, and Lower San Pedro aquifer systems. Most pumpage in the two basins is from the Upper San Pedro aquifer system. Assessment of the three-dimensional geochemical data provides insight into the sources of recharge and the movement and age of ground water in the study area. Major-ion data indicate the chemical character of water containing less than 500 mg/L dissolved solids generally grades from calcium-bicarbonate/sulfate to sodium bicarbonate. Sodium-chloride water, high in dissolved solids, is present in wells near the coast. Stable isotopes of oxygen and hydrogen provide information on sources of recharge to the basin, including imported water and water originating in the San Fernando Valley, San Gabriel Valley, and the coastal plain and surrounding hills. Tritium and carbon-14 data provide information on relative ground-water ages. Water with abundant tritium (greater than 8 tritium units) is found in and downgradient from the Montebello Forebay and near the seawater barrier projects, indicating recent recharge. Water with less than measurable tritium is present in, and downgradient from, the Los Angeles Forebay and in most wells in the West Coast Basin. Water from several deep wells was analyzed for carbon-14. Uncorrected estimates of age for these samples range from 600 to more than 20,000 years before present. Chemical and isotopic data are combined to evaluate changes in chemical character along flow paths emanating from the Montebello and Los Angeles Forebays. A four-layer ground-water flow model was developed to simulate steady-state ground-water conditions representative of those in 1971 and transient conditions for the period 1971?2000. Model results indicate increases in ground-water storage in all parts of the study area over the simulated thirty-year period. The model was used to develop a three-dimensional ground-water budget and to assess impacts of two alternative future (2001?25) ground-water development scenarios?one that assumes continued pumping at average current rates and a second that assumes increasing pumping from most wells in the Central Basin. The model simulates stable or slightly increasing water levels for the first scenario and declining water levels (25 to 50 ft in the Central Basin) in the second scenario. Model sensitivity to parameter values and to the assumed Orange County boundary condition was evaluated. Particle tracking was applied to simulate advective transport of water from the spreading ponds, the coastline, and the seawater injection barriers. Particle tracking results indicate that most flow within the Upper San Pedro aquifer system occurs within about 20 percent of the total aquifer system thickness and that virtually all water injected into the seawater barrier projects has flowed inland. The simulation model was linked with optimizatio

Reichard, Eric G.; Land, Michael; Crawford, Steven M.; Johnson, Tyler; Everett, Rhett R.; Kulshan, Trayle V.; Ponti, Daniel J.; Halford, Keith L.; Johnson, Theodore A.; Paybins, Katherine S.; Nishikawa, Tracy

2003-01-01

355

Evaluation of surface-water/ground-water interactions in the Santa Clara River Valley, Ventura County, California  

USGS Publications Warehouse

The interactions of surface water and ground water along the Santa Clara River in Ventura County, California, were evaluated by analyzing river-discharge and water-quality data and geohydrologic information collected by the U.S. Geological Survey between 1993 and 1995 for the Piru, Fillmore, and Santa Paula subbasins. Measurements of discharge and water quality were made at multiple locations along the Santa Clara River and its tributaries at eight different time periods during different releases from Lake Piru. Geologic, hydraulic, and water-quality data were collected from three new multiple-completion ground-water monitoring wells. These data, together with data collected as part of the U.S. Geological Survey Southern California Regional Aquifer-System Analysis (RASA) study, were analyzed in order to quantify rates and locations of ground-water recharge and discharge within the river, characterize the correlation of recharge and discharge rates with ground-water conditions and reservoir releases, and better characterize the three-dimensional ground-water flow system. Analysis of the data indicates that the largest amount of ground-water recharge from the river consistently occurs in the Piru subbasin. Some ground-water recharge from the river may occur in the upper part of the Fillmore subbasin. Increases in sulfate concentrations indicate that increases in flow at the lower ends of the Piru and Fillmore subbasins result from high-sulfate ground-water discharge. Increases in flow in the lower part of the Santa Paula subbasin are not accompanied by significant sulfate increases. Several sets of regressions indicate possible correlation between net flow changes in the river and depths to ground water and release rates from Lake Piru. These statistical relations may be of use for evaluating alternative Lake Piru release strategies. Data on the stable isotopes of hydrogen and oxygen from the ground-water monitoring wells that were installed as part of this investigation were used to distinguish between zones affected by recharge from the Santa Clara River and zones affected by recharge from local precipitation. Tritium data from a new multiple-completion monitoring site indicate that near the river in the upper Santa Paula subbasin, recent (post-1950) recharge water is not present at depths greater than about 350 feet below land surface. Water-level and lithologic data from the monitoring site indicate that the river and the Shallow aquifer have only limited hydraulic connection to the underlying aquifers at this location. Water-level data from the Shallow aquifer and from an in-stream drive point were used in an analytic model to estimate hydraulic properties governing stream?aquifer interactions in the upper Santa Paula subbasin. Hydraulic conductivities in all the USGS monitoring wells were estimated on the basis of slug tests.

Reichard, Eric George; Crawford, Steven M.; Paybins, Katherine S.; Martin, Peter; Land, Michael T.; Nishikawa, Tracy

1999-01-01

356

Users' guide to system dynamics model describing Coho salmon survival in Olema Creek, Point Reyes National Seashore, Marin County, California  

USGS Publications Warehouse

The system dynamics model described in this report is the result of a collaboration between U.S. Geological Survey (USGS) scientists and National Park Service (NPS) San Francisco Bay Area Network (SFAN) staff, whose goal was to develop a methodology to integrate inventory and monitoring data to better understand ecosystem dynamics and trends using salmon in Olema Creek, Marin County, California, as an example case. The SFAN began monitoring multiple life stages of coho salmon (Oncorhynchus kisutch) in Olema Creek during 2003 (Carlisle and others, 2013), building on previous monitoring of spawning fish and redds. They initiated water-quality and habitat monitoring, and had access to flow and weather data from other sources. This system dynamics model of the freshwater portion of the coho salmon life cycle in Olema Creek integrated 8 years of existing monitoring data, literature values, and expert opinion to investigate potential factors limiting survival and production, identify data gaps, and improve monitoring and restoration prescriptions. A system dynamics model is particularly effective when (1) data are insufficient in time series length and/or measured parameters for a statistical or mechanistic model, and (2) the model must be easily accessible by users who are not modelers. These characteristics helped us meet the following overarching goals for this model: Summarize and synthesize NPS monitoring data with data and information from other sources to describe factors and processes affecting freshwater survival of coho salmon in Olema Creek. Provide a model that can be easily manipulated to experiment with alternative values of model parameters and novel scenarios of environmental drivers. Although the model describes the ecological dynamics of Olema Creek, these dynamics are structurally similar to numerous other coastal streams along the California coast that also contain anadromous fish populations. The model developed for Olema can be used, at least as a starting point, for other watersheds. This report describes each of the model elements with sufficient detail to guide the primary target audience, the NPS resource specialist, to run the model, interpret the results, change the input data to explore hypotheses, and ultimately modify and improve the model. Running the model and interpreting the results does not require modeling expertise on the part of the user. Additional companion publications will highlight other aspects of the model, such as its development, the rationale behind the methodological approach, scenario testing, and discussions of its use. System dynamics models consist of three basic elements: stocks, flows, and converters. Stocks are measurable quantities that can change over time, such as animal populations. Flows are any processes or conditions that change the quantity in a stock over time (Ford, 1999), are expressed in the model as a rate of change, and are diagrammed as arrows to or from stocks. Converters are processes or conditions that change the rate of flows. A converter is connected to a flow with an arrow indicating that it alters the rate of change. Anything that influences the rate of change (such as different environmental conditions, other external factors, or feedbacks from other stocks or flows) is modeled as a converter. For example, the number of fish in a population is appropriately modeled as a stock. Mortality is modeled as a flow because it is a rate of change over time used to determine the number of fish in the population. The density-dependent effect on mortality is modeled as a converter because it influences the rate of morality. Together, the flow and converter change the number, or stock, of juvenile coho. The instructions embedded in the stocks, flows, converters, and the sequence in which they are linked are processed by the simulation software with each completed sequence composing a model run. At each modeled time step within the model run, the stock counts will go up, down, or stay the same based on the modeled flows and the influence of converters on those f

Woodward, Andrea; Torregrosa, Alicia; Madej, Mary Ann; Reichmuth, Michael; Fong, Darren

2014-01-01

357

Five-year resurvey for endangered species on Naval Petroleum Reserve No. 1, (Elk Hills), Kern County, California  

SciTech Connect

A transect survey of Naval Petroleum Reserve No. 1 (NPR-1), Kern County, California, was conducted between July 3 and August 5, 1989 to determine the distribution and relative density of endangered species and other wildlife. Results were compared with other reported results, particularly the 1979 and 1984 surveys of NPR-1. A total of 589.8 miles of transects were walked through approximately 47,235 acres in all or parts of 81 sections. Of the 516 San Joaquin kit fox dens observed, 496 were typical subterranean dens and 20 were atypical dens in man-made structures. Estimated den density was 36.7 [plus minus] 4.1 per square mile; and relative den density was 10.5/1,000 acres for all of NPR-1. Characteristics of typical kit fox dens were comparable to characteristics reported for other studies, except mean number of entrances per den, which was lower. Observers counted a total of 300 dens previously marked with an identification sign, 191 of which contained at least one complete entrance and would have been observed without a sign. Relative densities of preferred kit fox prey, black-toiled jackrabbits (40.1/1,000 acres) and desert cottontails (14.1/1,000 acres), were lower than previously recorded. Five blunt-nosed leopard lizards were observed along the southwest and northeast perimeter of the Reserve. Most of the 59 giant kangaroo rat burrow systems were observed in the flat terrain along the northeast and south perimeters of the Reserve. San Joaquin antelope squirrels were observed in the central and western parts of NPR- 1. A total of 73 antelope squirrels were observed, and the relative density was 1.511,000 acres. A total.of 30 possible environmental hazards were observed during transect surveys. Most of these were oil and water leaks of small size and appeared to pose little risk to endangered species. Results of this survey indicate that NPR-1 is supporting less wildlife than it did during either the 1979 or 1984 surveys.

Otten, M.R.M.; O'Farrell, T.P.; Briden, L.E.

1992-06-01

358

Five-year resurvey for endangered species on Naval Petroleum Reserve No. 1, (Elk Hills), Kern County, California  

SciTech Connect

A transect survey of Naval Petroleum Reserve No. 1 (NPR-1), Kern County, California, was conducted between July 3 and August 5, 1989 to determine the distribution and relative density of endangered species and other wildlife. Results were compared with other reported results, particularly the 1979 and 1984 surveys of NPR-1. A total of 589.8 miles of transects were walked through approximately 47,235 acres in all or parts of 81 sections. Of the 516 San Joaquin kit fox dens observed, 496 were typical subterranean dens and 20 were atypical dens in man-made structures. Estimated den density was 36.7 {plus_minus} 4.1 per square mile; and relative den density was 10.5/1,000 acres for all of NPR-1. Characteristics of typical kit fox dens were comparable to characteristics reported for other studies, except mean number of entrances per den, which was lower. Observers counted a total of 300 dens previously marked with an identification sign, 191 of which contained at least one complete entrance and would have been observed without a sign. Relative densities of preferred kit fox prey, black-toiled jackrabbits (40.1/1,000 acres) and desert cottontails (14.1/1,000 acres), were lower than previously recorded. Five blunt-nosed leopard lizards were observed along the southwest and northeast perimeter of the Reserve. Most of the 59 giant kangaroo rat burrow systems were observed in the flat terrain along the northeast and south perimeters of the Reserve. San Joaquin antelope squirrels were observed in the central and western parts of NPR- 1. A total of 73 antelope squirrels were observed, and the relative density was 1.511,000 acres. A total.of 30 possible environmental hazards were observed during transect surveys. Most of these were oil and water leaks of small size and appeared to pose little risk to endangered species. Results of this survey indicate that NPR-1 is supporting less wildlife than it did during either the 1979 or 1984 surveys.

Otten, M.R.M.; O`Farrell, T.P.; Briden, L.E.

1992-06-01

359

Physical, chemical, and isotopic data for samples from the Anderson Springs area, Lake County, California, 1998-1999  

USGS Publications Warehouse

Anderson Springs is located about 90 miles (145 kilometers) north of San Francisco, California, in the southwestern part of Lake County. The area was first developed in the late 1800s as a health resort, which was active until the 1930s. In the rugged hills to the south of the resort were four small mercury mines of the eastern Mayacmas quicksilver district. About 1,260 flasks of mercury were produced from these mines between 1909 and 1943. In the 1970s, the high-elevation areas surrounding Anderson Springs became part of The Geysers geothermal field. Today, several electric powerplants are located on the ridges above Anderson Springs, utilizing steam produced from a 240°C vapor-dominated reservoir. The primary purpose of this report is to provide physical, chemical, and isotopic data on samples collected in the Anderson Springs area during 1998 and 1999, in response to a Freedom of Information Act request. In July 1998, drainage from the Schwartz adit of the abandoned Anderson mercury mine increased substantially over a 2-day period, transporting a slurry of water and precipitates down a tributary and into Anderson Creek. In August 1998, J.J. Rytuba and coworkers sampled the Schwartz adit drainage and water from the Anderson Springs Hot Spring for base metal and methylmercury analysis. They measured a maximum temperature (Tm) of 85°C in the Hot Spring. Published records show that the temperature of the Anderson Springs Hot Spring (main spring) was 63°C in 1889, 42–52°C from 1974 through 1991, and 77°C in March 1995. To investigate possible changes in thermal spring activity and to collect additional samples for geochemical analysis, C.J. Janik and coworkers returned to the area in September and December 1998. They determined that a cluster of springs adjacent to the main spring had Tm=98°C, and they observed that a new area of boiling vents and small fumaroles (Tm=99.3°C) had formed in an adjacent gully about 20 meters to the north of the main spring. During August–October 1999, several field trips were conducted in the vicinity of Anderson Springs to continue monitoring and sampling the thermal manifestations. The new fumarolic area had increased in temperature and in discharge intensity since 1998, and a zone of dead trees had developed on the steep bank directly west of the fumaroles. Ground temperatures and diffuse flow of CO2 flow through soils were measured in the area surrounding the main spring and new fumaroles and in the zone of tree-kill.

Janik, C. J.; Goff, F.; Sorey, M. L.; Rytuba, J. J.; Counce, D.; Colvard, E. M.; Huebner, M.; White, L. D.; Foster, A.

1999-01-01

360

Map showing locations of damaging landslides in Santa Cruz County, California, resulting from 1997-98 El Nino rainstorms  

USGS Publications Warehouse

Heavy rainfall associated with a strong El Nino caused over $150 million in landslide damage in the 10-county San Francisco Bay region during the winter and spring of 1998. A team of USGS scientists collected information on landslide locations and damage costs. About $14.5 million in damages were assessed in Santa Cruz County.

Baum, Rex L.; Schuster, Robert L.; Godt, Jonathan W.

1999-01-01

361

California coastal processes study, LANDSAT 2  

NASA Technical Reports Server (NTRS)

The authors have identified the following significant results. By using suspended sediments as tracers, objectives were met by qualitative definition of the nearshore circulation along the entire coast of California with special study sites at Humboldt Bay, the mouth of the Russian River, San Francisco Bay, Monterey Bay, and the Santa Barbara Channel. Although LANDSAT primarily imaged fines and silts in the surface waters, the distribution of sediments allowed an examination of upwelling, convergences and coastal erosion and deposition. In Monterey Bay and Humboldt Bay, these coastal phenomena were used to trace seasonal trends in surface currents.

Pirie, D. M.; Steller, D. D. (principal investigators)

1977-01-01

362

Collegiality and Complexity: Humboldt's Relevance to British Universities Today  

ERIC Educational Resources Information Center

The two fundamental features of Humboldt's prescription for the new University of Berlin in 1810--research-like learning as a collaboration of teachers and students, and academic freedom of research and teaching (based essentially on an intuitive, but deep understanding of complexity theory)--are as valid now as they were 200 years ago in spite of…

Elton, Lewis

2008-01-01

363

LUMINESCENCE DANS LES SOLIDES LECTRONIQUEMENT ACTIFS Par HUMBOLDT W. LEVERENZ,  

E-print Network

612. LUMINESCENCE DANS LES SOLIDES �LECTRONIQUEMENT ACTIFS Par HUMBOLDT W. LEVERENZ, R. C. A of solids and of luminescence. LI JOURNAL DE PHYSIQUE ET LE RADIUM TOME 17, AOUT-SEPTEMBRE 1956, PAGE 612 luminescence. 1. L'orientation des spins des atomes voisins,' parallèles ou antiparallèles, provoque le ferro

Paris-Sud XI, Université de

364

Use of USGS earth-science products by county planning agencies in the San Francisco Bay region, California  

USGS Publications Warehouse

An inventory of the use of USGS products in selected planning studies, plans, ordinances, and other planning activities was made for eight counties in the San Francisco Bay region--a region of almost five million people. This inventory was designed to determine and document the use of the 87 earth-science information products prepared as a part of the San Francisco Bay Region Environment and Resources Planning Study (SFBRS). The inventory showed that: (1) all eight counties had planning staffs who were very familiar with SFBRS products and had made frequent use of such products; (2) all eight counties had prepared planning documents which cite SFBRS products; (3) the types of planning applications most often indicated were: geologic hazards studies, seismic safety and public safety plan elements, general reference, and the preparation and review of environmental impact reports and statements; (4) over 90 percent of the 87 SFBRS products were used at least once, and nine of the products were used over 30 times each for various county planning activities; and (5) at least 85 other USGS products were also used for various county planning activities. After the inventory, selected county officials, employees, and consultants were interviewed and asked--among other things--to indicate any problems in the use of the SFBRS products, to suggest improvements, and to identify any needed or desired earth-science information. The responses showed that: (1) the scales commonly used for working maps were 1:62,500 or larger and for plan implementation were 1:24,000 or larger; (2) only one county had a geologist on its planning staff, although six others had the benefit of geotechnical services from private consulting firms, county engineering staffs, or the State Division of Mines and Geology; (3) seven of the eight counties expressed some problems in using the products, primarily because of their small scale or lack of detail; (4) all eight counties expected to continue to use the products and expressed a need or desire for additional earth-science, engineering, or other information; (5) all eight counties suggested specific improvements to future products, primarily larger scale or more detail and fewer technical or more interpretive products; and (6) all eight counties received educational, advisory, and review services from USGS personnel. Seventeen selected examples of the application of SFBRS products to various county planning activities are discussed and illustrated. These examples include four planning studies, seven plans, and two ordinances. From the inventory and responses to the interviews, it is concluded that the counties in the Bay region are very familiar with, have made frequent use of, and will continue to use SFBRS products for a wide range of county planning activities. Suggestions to ensure more effective use of earth-science information in the future include: (1) monitoring emerging critical issues and analyzing new state and federal laws and regulations so as to better anticipate and respond to county earth-science information needs; (2) creating a users advisory committee to help identify critical issues and user needs; (3) providing engineering interpretations and land- and water-use capability ratings to make earth-science information more readily usable; (4) giving priority to areas impacted by development so as to husband staff resources; (5) providing earth-science information at the larger scale and greater detail commonly used and needed by counties; (6) releasing earth-science information earlier and according to a formal distribution pattern; and (7) providing educational, advisory, and review services in connection with any earth-science information designed for planners and decisionmakers.

Kockelman, William J.

1976-01-01

365

50 CFR Table 5 to Part 226 - Hydrologic Units and Counties Containing Critical Habitat for Central California Coast Coho...  

Code of Federal Regulations, 2012 CFR

...Counties and tribal lands contained in hydrologic unit and within the range of ESU 1,2 Dams (reservoirs) San Lorenzo-Soquel 18060001 Santa Cruz (CA), San Mateo (CA) Newell Dam (Loch Lomond). San Francisco Coastal South 18050006...

2012-10-01

366

50 CFR Table 5 to Part 226 - Hydrologic Units and Counties Containing Critical Habitat for Central California Coast Coho...  

Code of Federal Regulations, 2013 CFR

...Counties and tribal lands contained in hydrologic unit and within the range of ESU 1 2 Dams (reservoirs) San Lorenzo-Soquel 18060001 Santa Cruz (CA), San Mateo (CA) Newell Dam (Loch Lomond). San Francisco Coastal South 18050006...

2013-10-01

367

Tracing reclaimed water in the Menifee, Winchester, and Perris-South ground-water subbasins, Riverside County, California  

USGS Publications Warehouse

As a component in the management of water resources in the Menifee, Winchester, and Perris-South subbasins in Riverside County, California, ponds are operated by the Eastern Municipal Water District for the temporary storage of reclaimed water that is produced by several regional water-reclamation facilities. A primary goal of this study was to evaluate the potential for using various ground-water constituents or characteristics as tracers of reclaimed water that has infiltrated from the storage ponds into the ground water in the three subbasins. A secondary goal was to estimate the degree to which the infiltrated reclaimed water has mixed with the native ground water. The evaluation of potential tracers and the estimation of mixing focused on data from wells located relatively close to the ponds. The most useful constituents and characteristics for evaluation of the fate and mixing of reclaimed water in the Menifee, Winchester, and Perris-South subbasins are major-ion composition, stable isotopes of hydrogen and oxygen, ultraviolet absorbance (UV-A), chloride concentration, and boron/chloride ratio plotted against chloride concentration. Emphasis in this study was placed on evaluating the utility of UV-A as a tracer and boron/chloride ratios in estimating the fraction of reclaimed water in ground water. In the Menifee subbasin, major-ion data, stable isotopes, chloride, UV-A, and boron/chloride ratio are all useful in identifying reclaimed water, and the results based on these indicators are consistent with each other. The results suggest that values of UV-A greater than or equal to 0.007 indicate the presence of reclaimed water in the Menifee subbasin. Ground-water samples with UV-A greater than 0.007 are estimated to consist of about 75 to 100 percent reclaimed water, on the basis of chloride-mixing calculations and boron/chloride-versus-chloride mixing calculations. In the Winchester subbasin, results based on the same factors used in the Menifee subbasin are less conclusive; nevertheless, UV-A can be used as a tracer. The results suggest that values of UV-A greater than 0.01 indicate the presence of reclaimed water. Values from 0.006 to 0.01 may indicate the presence of reclaimed water; however, water from wells not likely to have reclaimed water may also have UV-A values in this range. Ground-water samples with UV-A greater than 0.01 seem to contain about 25 percent reclaimed water (range 6 to 32 percent), on the basis of the consistency of the results of three types of mixing calculations--chloride alone, boron/chloride versus chloride, and UV-A. In the Perris-South subbasin, the potential tracers are not as conclusive in identifying reclaimed water in the subsurface as in the Menifee and Winchester subbasins. The less-conclusive results are a consequence of the multiple, spatially distributed sources of reclaimed water; the relative absence of wells close to the reclaimed-water pond; and the short period of operation (about 1 year) of the pond at the time of sampling. Mixing calculations suggest that ground-water samples with elevated UV-A values (greater than 0.01) in the Perris-South subbasin could contain as much as 40 to 65 percent reclaimed water.

Kaehler, Charles A.; Belitz, Kenneth

2003-01-01

368

Analysis of methods to determine storage capacity of, and sedimentation in, Loch Lomond Reservoir, Santa Cruz County, California, 2009  

USGS Publications Warehouse

In 2009, the U.S. Geological Survey, in cooperation with the City of Santa Cruz, conducted bathymetric and topographic surveys to determine the water storage capacity of, and the loss of capacity owing to sedimentation in, Loch Lomond Reservoir in Santa Cruz County, California. The topographic survey was done as a supplement to the bathymetric survey to obtain information about temporal changes in the upper reach of the reservoir where the water is shallow or the reservoir may be dry, as well as to obtain information about shoreline changes throughout the reservoir. Results of a combined bathymetric and topographic survey using a new, state-of-the-art method with advanced instrument technology indicate that the maximum storage capacity of the reservoir at the spillway altitude of 577.5 feet (National Geodetic Vertical Datum of 1929) was 8,646 ±85 acre-feet in March 2009, with a confidence level of 99 percent. This new method is a combination of bathymetric scanning using multibeam-sidescan sonar, and topographic surveying using laser scanning (LiDAR), which produced a 1.64-foot-resolution grid with altitudes to 0.3-foot resolution and an estimate of total water storage capacity at a 99-percent confidence level. Because the volume of sedimentation in a reservoir is considered equal to the decrease in water-storage capacity, sedimentation in Loch Lomond Reservoir was determined by estimating the change in storage capacity by comparing the reservoir bed surface defined in the March 2009 survey with a revision of the reservoir bed surface determined in a previous investigation in November 1998. This revised reservoir-bed surface was defined by combining altitude data from the 1998 survey with new data collected during the current (2009) investigation to fill gaps in the 1998 data. Limitations that determine the accuracy of estimates of changes in the volume of sedimentation from that estimated in each of the four previous investigations (1960, 1971, 1982, and 1998) are a result of the limitations of the survey equipment and data-processing methods used. Previously used and new methods were compared to determine the recent (1998-2009) change in storage capacity and the most accurate and cost-effective means to define the reservoir bed surface so that results can be easily replicated in future surveys. Results of this investigation indicate that the advanced method used in the 2009 survey accurately captures the features of the wetted reservoir surface as well as features along the shoreline that affect the storage capacity calculations. Because the bathymetric and topographic data are referenced to a datum, the results can be easily replicated or compared with future results. Comparison of the 2009 reservoir-bed surface with the surface defined in 1998 indicates that sedimentation is occurring throughout the reservoir. About 320 acre-feet of sedimentation has occurred since 1998, as determined by comparing the revised 1998 reservoir-bed surface, with an associated maximum reservoir storage capacity of 8,965 acre-feet, to the 2009 reservoir bed surface, with an associated maximum capacity of 8,646 acre-feet. This sedimentation is more than 3 percent of the total storage capacity that was calculated on the basis of the results of the 1998 bathymetric investigation.

McPherson, Kelly R.; Freeman, Lawrence A.; Flint, Lorraine E.

2011-01-01

369

Violence and Intimidation: Rising Bigotry toward Arabs and Muslims. Report on a Public Hearing by the Los Angeles County Commission on Human Relations (Los Angeles, California, March 14, 1991).  

ERIC Educational Resources Information Center

Responding to a rise in hate crimes directed toward persons of Arab descent and Muslims before and during the Gulf War, the Los Angeles County (California) Commission on Human Relations held a hearing. The commission heard presentations by representatives of the Arab and Muslim communities, law enforcement, schools, and social science, and…

Chan, Carole

370

Who Enrolls in a Program for Parents of Publicly Insured Children? Evidence from Alameda County, California, Highlights the Promise of a Program to Insure Low-Income Working Parents. Health Affairs Web Exclusive  

Microsoft Academic Search

Although interest in expanding SCHIP coverage to parents has grown in recent years, few such expansions have actually been implemented. State governments and health plan administrators remain concerned that these expansions will attract only high-risk enrollees, resulting in costly premiums that require large subsidies. This article examines characteristics of enrollees in a SCHIP-like expansion program in Alameda County, California. According

Erin Fries Taylor; Jeffrey T. Kullgren; Catherine G. McLaughlin

2003-01-01

371

Biostratigraphic and lithologic correlations of two Sonoma County Water Agency pilot wells with the type Wilson Grove Formation, Sonoma County, central California  

USGS Publications Warehouse

Small mollusk faunas characteristic of the uppermost part of the Wilson Grove Formation at Wilson Grove and along River Road at Trenton (Pliocene) were encountered in Sonoma County Water Agency pilot wells at Occidental Road well field between 320-500 ft (98-152 m), depth, and in the Sebastopol Road pilot well field between 560-570 ft (171-174 m), depth. These mollusks support correlations between the two wells made on lithologic grounds. A benthic foraminifer was recovered from between 380-390 ft (116-119 m), depth, in the Sonoma County Water Agency Occidental Road pilot well. Though an isolated specimen, the presence of this well-preserved foraminifer supports the environmental interpretation of less than 100 m on the continental shelf indicated by the molluscan assemblages at this site. For this marine stratigraphic interval of the Wilson Grove Formation, we suggest a relatively narrow age range of 5.3 (Miocene-Pliocene boundary) to ~ 4.5 Ma based on the stratigraphic relations of correlative marine strata around the upland margin of Santa Rosa plain and correlative strata in the Santa Cruz area, although an age between 5.3 and ~ 2.8 Ma cannot be discounted.

Powell, Charles L., II; McLaughlin, Robert J.; Wan, Elmira

2006-01-01

372

Distinguishing sediment waves from slope failure deposits: Field examples, including the 'humboldt slide', and modelling results  

USGS Publications Warehouse

Migrating sediment waves have been reported in a variety of marine settings, including submarine levee-fan systems, floors of fjords, and other basin or continental slope environments. Examination of such wave fields reveals nine diagnostic characteristics. When these characteristics are applied to several features previously attributed to submarine landslide deformation, they suggest that the features should most likely be reinterpreted as migrating sediment-wave fields. Sites that have been reinterpreted include the 'Humboldt slide' on the Eel River margin in northern California, the continental slope in the Gulf of Cadiz, the continental shelf off the Malaspina Glacier in the Gulf of Alaska, and the Adriatic shelf. A reassessment of all four features strongly suggests that numerous turbidity currents, separated by intervals of ambient hemipelagic sedimentation, deposited the wave fields over thousands of years. A numerical model of hyperpycnal discharge from the Eel River, for example, shows that under certain alongshore-current conditions, such events can produce turbidity currents that flow across the 'Humboldt slide', serving as the mechanism for the development of migrating sediment waves. Numerical experiments also demonstrate that where a series of turbidity currents flows across a rough seafloor (i.e. numerical steps), sediment waves can form and migrate upslope. Hemipelagic sedimentation between turbidity current events further facilitates the upslope migration of the sediment waves. Physical modelling of turbidity currents also confirms the formation and migration of seafloor bedforms. The morphologies of sediment waves generated both numerically and physically in the laboratory bear a strong resemblance to those observed in the field, including those that were previously described as submarine landslides.

Lee, H. J.; Syvitski, J. P. M.; Parker, G.; Orange, D.; Locat, J.; Hutton, E. W. H.; Imran, J.

2002-01-01

373

Distribution of dens used by radiocollared San Joaquin kit fox on Naval Petroleum Reserve No. 1, Kern County, California, 1980-1987  

SciTech Connect

Locations of 945 dens used by radiocollared San Joaquin kit foxes (Vulpes macrotis mutica) on or adjacent to the US Department of Energy's Naval Petroleum Reserve No. 1 (NPR-1) in western Kern County, California between 1980-1987 were recorded on maps and stored within a computer-compatible data base. Most (516 of 887) typical subterranean dens of this endangered species were found in undeveloped portions of 65 sections, but most (41 of 58) atypical dens (dens in man-made structures) were found in developed portions of 26 sections. Program managers can plan construction, maintenance, and operational activities on NPR-1 in ways that avoid potential conflicts with the conservation of kit fox dens by using the section maps provided in this report or by accessing the computerized data base through the Endangered Species Contractor, EG and G Energy Measurements, Inc. 20 refs., 3 figs, 1 tab.

O'Farrell, T.P.; Tabor, S.P.; Kato, T.T.

1987-09-01

374

Survey of potential habitat for the endangered San Joaquin kit fox (Vulpes macrotis mutica) in the Carrizo Plain, San Luis Obispo County, California. [Vulpes macrotis mutica  

SciTech Connect

A field study was conducted for the US Fish and Wildlife Service to determine the presence and distribution of the endangered San Joaquin kit fox (Vulpes macrotis mutica), and to map land use patterns on the Carrizo Plain, eastern San Luis Obispo County, California. The survey was conducted in July 1985 and covered approximately 8140 acres in 20 sections of land. A total of 41 kit fox dens were found. The highest number of kit fox dens observed per 1000 acres was 12; the lowest was 1.5. Approximately 29,720 acres (49%) were grazed by cattle and sheep, 25,600 acres (42%) were cultivated for dry-land farming, but land use was not determined for 5560 acres (9%).

Kato, T.T.

1986-10-01

375

Joint environmental assessment for Chevron USA, Inc. and Santa Fe Energy Resources, Inc.: Midway Valley 3D seismic project, Kern County, California  

SciTech Connect

The proposed Midway Valley 3D Geophysical Exploration Project covers approximately 31,444 aces of private lands, 6,880 acres of Department of Energy (DOE) Lands within Naval Petroleum Reserve 2 (NPR2) and 3,840 acres of lands administered by the Bureau of Land Management (BLM), in western Kern County, California. This environmental assessment (EA) presents an overview of the affected environment within the project area using results of a literature review of biological field surveys previously conducted within or adjacent to a proposed 3D seismic project. The purpose is to provide background information to identify potential and known locations of sensitive wildlife and special status plant species within the proposed seismic project area. Biological field surveys, following agency approved survey protocols, will be conducted during October through November 1996 to acquire current resources data to provide avoidance as the project is being implemented in the field.

NONE

1996-10-01

376

Map showing recent (1997-98 El Nino) and historical landslides, Crow Creek and vicinity, Alameda and Contra Costa Counties, California  

USGS Publications Warehouse

This report documents the spatial distribution of 3,800 landslides caused by 1997-98 El Ni?o winter rainfall in the vicinity of Crow Creek in Alameda and Contra Costa Counties, California. The report also documents 558 historical (pre-1997-98) landslides. Landslides were mapped from 1:12,000-scale aerial photographs and classified as either debris flows or slides. Slides include rotational and translational slides, earth flows, and complex slope movements. Debris flows and slides from the 1997-98 winter modified 1 percent of the surface of the 148.6 km2 study area. Debris flows were scattered throughout the area, regardless of the type of underlying bedrock geology. Slides, however, were concentrated in a soft sandstone, conglomerate, and clayey group of rock units. Digital map files accompany the report.

Coe, Jeffrey A.; Godt, Jonathan; Tachker, Pierre

2004-01-01

377

An examination of cesarean and vaginal birth histories among Hispanic women entering prenatal care in two California counties with large immigrant populations.  

PubMed

Repeat cesarean delivery (CD) rates among US Hispanic women are the highest of all racial/ethnic groups (90%). Vaginal birth after cesarean (VBAC) is an alternative delivery method, but requires medical records documentation of a non-vertical incision and favorable conditions in the current pregnancy. VBAC rates for Hispanic women are extremely low. This study explores the birth histories and medical records access among Hispanic women in California, taking into account the potential role of immigration on access to VBAC. Study aims are to describe for a sample of Hispanic women: (1) CD and VBAC histories as well as history of vaginal delivery preceding CD; and (2) medical records access, among women who had previous births in Mexico. Chart review was conducted for prenatal patients from three safety net clinics in two California counties with large Mexican migrant populations between August, 2003 and February 2004--during which VBAC was widely available in these two counties to determine: obstetric histories, CD details, birthplace and whether or not medical records had been requested/obtained for CD. 355 multiparous Hispanic women were included. Thirty-three percent had a previous CD, almost two-thirds (64%) had only one CD. Over half of the women (55%) with 2+ births and CD history also reported a vaginal birth history. Medical records for CD were infrequently requested (29%). Of those requested, records were received for 77% of women with a US CD, compared with 13% of women with Mexican CD histories. Policies to address: (1) VBAC opportunities for low risk women, such as those with prior vaginal births and one CD, and (2) overcoming limited medical records access, could mitigate against unnecessary CD and associated medical expenditures and risks for future complications. PMID:21298482

Gonzalez-Mendez, Enrique; Gonzales-Mendez, Enrique; Gonzalez-Maddux, Catherine; Hall, Celeste; Maddux-Gonzalez, Mary; Handley, Margaret A

2012-04-01

378

Potential Effects of a Scenario Earthquake on the Economy of Southern California: Baseline County-Level Migration Characteristics and Trends 1995-2000 and 2001-2010  

USGS Publications Warehouse

The Multi-Hazards Demonstration Project (MHDP) is a collaboration between the U.S. Geological Survey (USGS) and various partners from the public and private sectors and academia, meant to improve Southern California's resiliency to natural hazards. In support of the MHDP objectives, the ShakeOut Scenario was developed. It describes a magnitude 7.8 earthquake along the southernmost 300 kilometers (200 miles) of the San Andreas Fault, identified by geoscientists as a plausible event that will cause moderate to strong shaking over much of the eight-county (Imperial, Kern, Los Angeles, Orange, Riverside, San Bernardino, San Diego, and Ventura) Southern California region. This report uses historical, estimated, and projected population data from several Federal and State data sources to estimate baseline characteristics and trends of the region's population migration (that is, changes in a person's place of residence over time). The analysis characterizes migration by various demographic, economic, family, and household variables for the period 1995-2000. It also uses existing estimates (beginning in 2001) of the three components of population change - births, deaths, and migration - to extrapolate near-term projections of county-level migration trends through 2010. The 2010 date was chosen to provide baseline projections corresponding to a two-year recovery period following the November 2008 date that was selected for the occurrence of the ShakeOut Scenario earthquake. The baseline characteristics and projections shall assist with evaluating the effects of inflow and outflow migration trends for alternative futures in which the simulated M7.8 earthquake either does or does not occur and the impact of the event on housing and jobs, as well as community composition and regional economy changes based on dispersion of intellectual, physical, economic, and cultural capital.

Sherrouse, Benson C.; Hester, David J.

2008-01-01

379

Exploring the Americas in a Humboldt Digital Library: Problems and Solutions  

E-print Network

Baron, Frank and Doherr, Detlev. “Exploring the Americas in a Humboldt Digital Library: Problems and Solutions.” Geographical Review 96 (2006): 439–50. Publisher’s official version: http://www.amergeog.org/gr/jul06/baron.html . Open Access.... “Exploring the Americas in a Humboldt Digital Library: Problems and Solutions.” Geographical Review 96 (2006): 439–50. Text of paper: Exploring the Americas in a Humboldt Digital Library: Problems and Solutions Frank Baron and Detlev Doherr...

Baron, Frank; Doherr, Detlev

2006-07-01

380

Distribution of dissolved nitrate and fluoride in ground water, Highland-East Highlands, San Bernardino County, California  

USGS Publications Warehouse

In the Highland-East Highlands area of southern California, concentrations of nitrate in water from many wells exceed the U.S. Environmental Protection Agency 's and the California Department of Health 's recommended limit for public water supplies. The nitrate standards for public water supplies in the study area are commonly met by blending the high-nitrate water with low-nitrate water before distribution; however, some of the low-nitrate water sources have fluoride concentrations that exceed the optimum level, or in a few cases exceed the maximum level recommended by the California Department of Health. Nitrate-nitrogen concentrations in the study area are generally between 1 and 20 milligrams per liter. In general, nitrate-nitrogen concentrations exceeding 10 milligrams per liter are found in water from wells perforated at depths of less than 500 feet. (Woodard-USGS)

Eccles, Lawrence A.; Klein, John M.

1978-01-01

381

75 FR 71179 - Environmental Impact Statement: San Diego County, CA  

Federal Register 2010, 2011, 2012, 2013

...Environmental Impact Statement: San Diego County, CA AGENCY: Federal Highway...for a proposed highway project in San Diego County, California. DATES: Public...Community Center, 2258 Island Avenue, San Diego, California 92102. FOR...

2010-11-22

382

Serologic survey for disease in endangered San Joaquin kit fox, Vulpes macrotis mutica, inhabiting the Elk Hills Naval Petroleum Reserve, Kern County, California  

SciTech Connect

Serum from endangered San Joaquin kit foxes, Vulpes macrotis mutica, and sympatric wildlife inhabiting the Elk Hills Petroleum Reserve, Kern County, and Elkhorn Plain, San Luis Obispo County, California, was collected in 1981 to 1982 and 1984, and tested for antibodies against 10 infectious disease pathogens. Proportions of kit fox sera containing antibodies against diseases were: canine parvovirus, 100% in 1981 to 1982 and 67% in 1984; infectious canine hepatitis, 6% in 1981 to 1982 and 21% in 1984; canine distemper, 0 in 1981 to 1982 and 14% in 1984; tularemia, 8% in 1981 to 1982 and 31% in 1984; Brucella abortus, 8% in 1981 to 1982 and 3% in 1984; Brucella canis, 14% in 1981 to 1982 and 0 in 1984; toxoplasmosis, 6% in 1981 to 1982; coccidioidomycosis, 3% in 1981 to 1982; and plague and leptospirosis, 0 in 1981 to 1982. High population density, overlapping home ranges, ability to disperse great distances, and infestation by ectoparasites were cited as possible factors in the transmission and maintenance of these diseases in kit fox populations.

McCue, P.M.; O'Farrell, T.P.

1986-07-01

383

Promising practices for delivery of court-supervised substance abuse treatment: Perspectives from six high-performing California counties operating Proposition 36  

PubMed Central

Operative for nearly a decade, California's voter-initiated Proposition 36 program offers many offenders community-based substance abuse treatment in lieu of likely incarceration. Research has documented program successes and plans for replication have proliferated, yet very little is known about how the Proposition 36 program works or practices for achieving optimal program outcomes. In this article, we identify policies and practices that key stakeholders perceive to be most responsible for the successful delivery of court-supervised substance abuse treatment to offenders under Proposition 36. Data was collected via focus groups conducted with 59 county stakeholders in six high-performing counties during 2009. Discussion was informed by seven empirical indicators of program performance and outcomes and was focused on identifying and describing elements contributing to success. Program success was primarily attributed to four strategies, those that: (1) fostered program engagement, monitored participant progress, and sustained cooperation among participants; (2) cultivated buy-in among key stakeholders; (3) capitalized on the role of the court and the judge; and (4) created a setting which promoted a high-quality treatment system, utilization of existing resources, and broad financial and political support for the program. Goals and practices for implementing each strategy are discussed. Findings provide a “promising practices” resource for Proposition 36 program evaluation and improvement and inform the design and study of other similar types of collaborative justice treatment efforts. PMID:20965568

Evans, Elizabeth; Anglin, M. Douglas; Urada, Darren; Yang, Joy

2010-01-01

384

Promising practices for delivery of court-supervised substance abuse treatment: perspectives from six high-performing California counties operating Proposition 36.  

PubMed

Operative for nearly a decade, California's voter-initiated Proposition 36 program offers many offenders community-based substance abuse treatment in lieu of likely incarceration. Research has documented program successes and plans for replication have proliferated, yet very little is known about how the Proposition 36 program works or practices for achieving optimal program outcomes. In this article, we identify policies and practices that key stakeholders perceive to be most responsible for the successful delivery of court-supervised substance abuse treatment to offenders under Proposition 36. Data was collected via focus groups conducted with 59 county stakeholders in six high-performing counties during 2009. Discussion was informed by seven empirical indicators of program performance and outcomes and was focused on identifying and describing elements contributing to success. Program success was primarily attributed to four strategies, those that: (1) fostered program engagement, monitored participant progress, and sustained cooperation among participants; (2) cultivated buy-in among key stakeholders; (3) capitalized on the role of the court and the judge; and (4) created a setting which promoted a high-quality treatment system, utilization of existing resources, and broad financial and political support for the program. Goals and practices for implementing each strategy are discussed. Findings provide a "promising practices" resource for Proposition 36 program evaluation and improvement and inform the design and study of other similar types of collaborative justice treatment efforts. PMID:20965568

Evans, Elizabeth; Anglin, M Douglas; Urada, Darren; Yang, Joy

2011-05-01

385

Effectiveness of Vegetated Buffer Strips in Reducing Dormant Season Orthophosphate Pesticide Loading to Surface Waters in Glenn County, Northern California  

Microsoft Academic Search

Riparian buffer strips are used in preventing nonpoint source contamination of agricultural runoff. The design and effectiveness of buffers varies widely under differing environmental conditions. Over the past two years, a project was implemented to evaluate the effectiveness of certain Best Management Practices in reducing organophosphate (OP) pesticide transport from almond orchards to local surface waters in Glenn County, northern

K. D. Gilbert; D. L. Brown; L. Altier; M. N. Oliver

2003-01-01

386

Late Quaternary deformation and slip rates in the northern San Andreas fault zone at Olema Valley, Marin County, California  

Microsoft Academic Search

Quaternary sedimentary deposits along the structural depression of the San Andreas fault (SAF) zone north of San Francisco in Marin County provide an excellent record of rates and styles of neotectonic deformation in a location near where the greatest amount of horizontal offset was measured after the great 1906 San Francisco earthquake. A high-resolution gravity survey in the Olema Valley

Karen Grove; Tina M. Niemi

2005-01-01

387

Yolo County, California, made history in July when officials installed a 1 MW solar photovoltaic (PV) project to supply power  

E-print Network

(PV) project to supply power to both a jail and juvenile center. The project is noteworthy because size required to meet the energy needs for the jail and juvenile facility. The county chose a site near maturity as opposed to in annual installments over the life of the bond, which was the case with old CREBs

388

Biostratigraphy of the San Joaquin Formation in borrow-source area B-17, Kettleman Hills landfill, North Dome, Kettleman Hills, Kings County, California  

USGS Publications Warehouse

The stratigraphic occurrences and interpreted biostratigraphy of invertebrate fossil taxa in the upper San Joaquin Formation and lower-most Tulare Formation encountered at the Chemical Waste Management Kettleman Hills waste disposal facility on the North Dome of the Kettleman Hills, Kings County, California are documented. Significant new findings include (1) a detailed biostratigraphy of the upper San Joaquin Formation; (2) the first fossil occurrence of Modiolus neglectus; (3) distinguishing Ostrea sequens from Myrakeena veatchii (Ostrea vespertina of authors) in the Central Valley of California; (4) differentiating two taxa previously attributed to Pteropurpura festivus; (5) finding a stratigraphic succession between Caesia coalingensis (lower in the section) and Catilon iniquus (higher in the section); and (6) recognizing Pliocene-age fossils from around Santa Barbara. In addition, the presence of the bivalves Anodonta and Gonidea in the San Joaquin Formation, both restricted to fresh water and common in the Tulare Formation, confirm periods of fresh water or very close fresh-water environments during deposition of the San Joaquin Formation.

Powell, Charles L.; Fisk, Lanny H.; Maloney, David F.; Haasl, David M.

2010-01-01

389

Combining Forces - The Use of Landsat TM Satellite Imagery, Soil Parameter Information, and Multiplex PCR to Detect Coccidioides immitis Growth Sites in Kern County, California  

PubMed Central

Coccidioidomycosis is a fungal disease acquired through the inhalation of spores of Coccidioides spp., which afflicts primarily humans and other mammals. It is endemic to areas in the southwestern United States, including the San Joaquin Valley portion of Kern County, California, our region of interest (ROI). Recently, incidence of coccidioidomycosis, also known as valley fever, has increased significantly, and several factors including climate change have been suggested as possible drivers for this observation. Up to date details about the ecological niche of C. immitis have escaped full characterization. In our project, we chose a three-step approach to investigate this niche: 1) We examined Landsat-5-Thematic-Mapper multispectral images of our ROI by using training pixels at a 750 m×750 m section of Sharktooth Hill, a site confirmed to be a C. immitis growth site, to implement a Maximum Likelihood Classification scheme to map out the locations that could be suitable to support the growth of the pathogen; 2) We used the websoilsurvey database of the US Department of Agriculture to obtain soil parameter data; and 3) We investigated soil samples from 23 sites around Bakersfield, California using a multiplex Polymerase Chain Reaction (PCR) based method to detect the pathogen. Our results indicated that a combination of satellite imagery, soil type information, and multiplex PCR are powerful tools to predict and identify growth sites of C. immitis. This approach can be used as a basis for systematic sampling and investigation of soils to detect Coccidioides spp. PMID:25380290

Lauer, Antje; Talamantes, Jorge; Castañón Olivares, Laura Rosío; Medina, Luis Jaime; Baal, Joe Daryl Hugo; Casimiro, Kayla; Shroff, Natasha; Emery, Kirt W.

2014-01-01

390

CALIFORNIA STATE UNIVERSITY, FULLERTON INSTITUTIONAL RESEARCH & ANALYTICAL STUDIES  

E-print Network

OF CALIFORNIA HIGH SCHOOL GRADUATES IN SELECTED COUNTIES/REGIONS Data from the State of California, Department% 34,560 9% Six County Subtotal 159,861 54% 211,723 55% 196,982 54% Other CA Counties Subtotal 138 GROWTH OF CA HIGH SCHOOL GRADS: ORANGE, LOS ANGELES COUNTIES; CALIFORNIA FROM BASE YEAR 1997-98 TO 2008

de Lijser, Peter

391

Merguerian, Charles, 1983c, Structural geology of the Calaveras-Shoo Fly Thrust (CSFT), Tuolumne and Mariposa counties, California.  

E-print Network

Merguerian, Charles, 1983c, Structural geology of the Calaveras-Shoo Fly Thrust (CSFT), Tuolumne- Middle Jurassic time before the onset of the Nevadan orogeny. To Cite This Abstract: Merguerian, Charles, California (abs.): Geological Society of America Abstracts with Programs, v. 15, p. 643. Filename: CM1983c

Merguerian, Charles

392

Rice Straw Compost as a Soil Amendment for the Reduction of Surface Runoff in Almond Orchards in Glenn County, California  

Microsoft Academic Search

Almond production in the Northern Sacramento Valley is dependant on dormant season pesticide application and fertilizers. However, over the past 10 years there has been increased demand from public and regulatory agencies for farmers to reduce the movement of agricultural chemicals into local water sources. Many pesticides of concern have been detected in California watersheds particularly after runoff producing storm

C. Coelho; M. McKinney; D. Brown; M. Johns

2004-01-01

393

The Obsidian Creep Project: Seismic Imaging in the Brawley Seismic Zone and Salton Sea Geothermal Field, Imperial County, California  

Microsoft Academic Search

In March 2010, we acquired medium- and high-resolution P- and S-wave seismic reflection and refraction data across faults in the Brawley seismic zone (BSZ) and across part of the Salton Sea Geothermal Field (SSGF), Imperial Valley, California. Our objectives were to determine the dip, possible structural complexities, and seismic velocities associated with the BSZ and SSGF. We acquired multiple seismic

R. D. Catchings; M. J. Rymer; M. Goldman; R. B. Lohman; J. J. McGuire

2010-01-01

394

Using a GIS to Model Tsunami Evacuation Times for the Community of Fairhaven, California  

NASA Astrophysics Data System (ADS)

The community of Fairhaven (pop. 200) is located at the southern end of the Samoa Peninsula in Humboldt County, California. Fairhaven experienced minor flooding from the 1964 Alaska teletsunami and lies within the inundation zone of numerical models for tsunamis generated by the Cascadia s¬ubduction zone. The highest elevations in the community are about 8 meters which potentially exposes the community to high velocity waves and tsunami inundation. This study modeled the evacuation times to reach the nearest designated evacuation area in the adjacent community of Samoa by foot, to determine if this time frame is realistic in the event of a tsunami evacuation. We used a GIS to generate a Cost Weighted Surface that takes into account distance, physical objects such as buildings, lakes, rivers and other obstructions, and elevation. The Spatial Analyst extension in ArcGIS along with 1 meter resolution NAIP imagery was used to construct a land-use polygon shapefile for the Samoa Peninsula. Slope values were imported into the Cost Weighted Surface with 5 meter resolution DEM's of the Humboldt Bay area. Land-use and slope were reclassified to contain speed values based on the type of surface or slope a pedestrian would walk over. Land-use was reclassified based on walking speed values attained in the field while slope values were reclassified based on Laghi and Cavalletti's criteria. Land-use and slope were then combined to create the final Cost Weighted Surface. Two evacuation time maps were created: one modeled pedestrian evacuation time to Samoa's official evacuation site and the other to a proposed evacuation site located within Fairhaven. The generated evacuation time maps show that evacuation times generally increase radially as the distance from the evacuation sites increases. However, this is untrue where slope and land use characteristics have more of an influence on evacuation time than distance. Maximum pedestrian evacuation times decreased from nearly two hours to reach the Samoa evacuation site to less than 17 minutes for the proposed Fairhaven site. This study is being used to promote a pilot project with Humboldt County and the Army Corps of Engineers to study the feasibility of an elevated tsunami evacuation berm at the proposed evacuation site.

Graehl, N.; Dengler, L.

2008-12-01

395

Evaluation of the potential for artificial ground-water recharge in eastern San Joaquin County, California; Phase 2  

USGS Publications Warehouse

In response to the increasing demand on water supplies and declining water levels in eastern 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, Calif. Phase 1 of this study evaluated the geologic and hydrological conditions in the area and selected 20 drill sites in three areas of high potential for artificial recharge of the aquifer system. In phase 2, test holes were drilled. This report is on phase 2, and summarizes the data collected during the drilling and evaluates the suitability of the drilled areas for their potential for artificial recharge. Two areas seem to have a fair potential for artificial recharge of the aquifer system using the basin-spreading method: (1) The flood plain area along the Mokelumne River north of Lockeford, and (2) an area northeast of Linden along the Calaveras River. (USGS)

Ireland, R. L.

1984-01-01

396

Sediment magnetic, paleomagnetic, and geochemical data from Quaternary lacustrine sediment in a core from Grass Lake, Siskiyou County, California  

USGS Publications Warehouse

Sediment magnetic and geochemical results have been obtained from the top 60 meters of lacustrine sediments recovered in two cores from Tule Lake in northern California. The sediment magnetic and geochemical data, presented here in tabular form, complement studies of diatoms and pollen in the cores that are the bases for published paleoclimatic interpretations. This report also documents the methods used to obtain the magnetic properties and geochemical data.

Best, Patti J.; Reynolds, Richard L.; Rosenbaum, Joseph G.; Drexler, John W.; Adam, David P.

1996-01-01

397

Sediment magnetic and geochemical data from Quaternary lacustine sediment in two cores from Tule Lake, Siskiyou County, California  

USGS Publications Warehouse

Sediment magnetic and geochemical results have been obtained from the top 60 meters of lacustrine sediments recovered in two cores from Tule Lake in northern California. The sediment magnetic and geochemical data, presented here in tabular form, complement studies of diatoms and pollen in the cores that are the bases for published paleoclimatic interpretations. This report also documents the methods used to obtain the magnetic properties and geochemical data.

Best, Patti J.; Reynolds, Richard L.; Rosenbaum, Joseph G.; Dean, Walter E.; Honey, Jeannine; Drexler, John W.; Adam, David P.

1996-01-01

398

Hydrogeologic setting and hydrologic data of the Smoke Creek Desert basin, Washoe County, Nevada, and Lassen County, California, water years 1988-90  

USGS Publications Warehouse

Smoke Creek Desert is a potential source of water for urban development in Washoe County, Nevada. Hydrogeologic data were collected from 1988 to 1990 to learn more about surface- and ground-water flow in the basin. Impermeable rocks form a boundary to ground-water flow on the east side of the basin and at unknown depths at the base of the flow system. Permeable volcanic rocks on the west and north sides of the basin represent a previously unrecognized aquifer and provide potential avenues for interbasin flow. Geophysical data indicate that basin-fill sediments are about 2,000 feet thick near the center of the basin. The geometry of the aquifers, however, remains largely unknown. Measurements of water levels, pressure head, flow rate, water temperature, and specific conductance at 19 wells show little change from 1988 to 1990. Chemically, ground water begins as a dilute sodium and calcium bicarbonate water in the mountain blocks, changes to a slightly saline sodium bicarbonate solution beneath the alluvial fans, and becomes a briny sodium chloride water near the playa. Concentrations of several inorganic constituents in the briny water near the playa commonly exceed Nevada drinking-water standards. Ground water in the Honey Lake basin and Smoke Creek Desert basin has similar stable-isotope composition, except near Sand Pass. If interbasin flow takes place, it likely occurs at depths greater than 400-600 feet beneath Sand Pass or through volcanic rocks to the north of Sand Pass. Measure- ments of streamflow indicate that about 2,800 acre-feet/year discharged from volcanic rocks to streamflow and a minimum of 7.300 acre-feet/year infiltrated and recharged unconsolidated sediments near Smoke, Buffalo, and Squaw Creeks during the period of study. Also about 1,500 acre-feet per year was lost to evapotranspiration along the channel of Smoke Creek, and about 1,680 acre-feet per year of runoff from Smoke, Buffalo, and Squaw Creeks was probably lost to evaporation from the playa.

Maurer, D.K.

1993-01-01

399

SF State Southern California Attrition Study, October 2012 Southern California Attrition Study  

E-print Network

California attrition by county or ethnicity, and Latino students. SF State is striving to become an Hispanic Angeles, Orange, Riverside, San Bernardino, San Diego, San Luis Obispo, Santa Barbara, Ventura counties. 0 Origin Six Bay Area county "Local Area" Southern California counties All other areas #12;SF State

400

Geologic map and digital database of the Yucaipa 7.5' quadrangle, San Bernardino and Riverside Counties, California  

USGS Publications Warehouse

This geologic database of the Yucaipa 7.5' quadrangle was prepared by the Southern California Areal Mapping Project (SCAMP), a regional geologic-mapping project sponsored jointly by the U.S. Geological Survey and the California Geological Survey. The database was developed as a contribution to the National Cooperative Geologic Mapping Program's National Geologic Map Database, and is intended to provide a general geologic setting of the Yucaipa quadrangle. The database and map provide information about earth materials and geologic structures, including faults and folds that have developed in the quadrangle due to complexities in the San Andreas Fault system. The Yucaipa 7.5' quadrangle contains materials and structures that provide unique insight into the Mesozoic and Cenozoic geologic evolution of southern California. Stratigraphic and structural elements include: (1) strands of the San Andreas Fault that bound far-traveled terranes of crystalline and sedimentary rock; (2) Mesozoic crystalline rocks that form lower and upper plates of the regionwide Vincent-Orocopia Thrust system; and (3) late Tertiary and Quaternary sedimentary materials and geologic structures that formed during the last million years or so and that record complex geologic interactions within the San Andreas Fault system. These materials and the structures that deform them provide the geologic framework for investigations of geologic hazards and ground-water recharge and subsurface flow. Geologic information contained in the Yucaipa database is general-purpose data that is applicable to land-related investigations in the earth and biological sciences. The term "generalpurpose" means that all geologic-feature classes have minimal information content adequate to characterize their general geologic characteristics and to interpret their general geologic history. However, no single feature class has enough information to definitively characterize its properties and origin. For this reason the database cannot be used for site-specific geologic evaluations, although it can be used to plan and guide investigations at the site-specific level.

Matti, Jonathan C.; Morton, D.M.; Cox, B.F.; Carson, S.E.; Yetter, T.J.; Digital preparation by: Cossette, P.M.; Wright, M.C.; Kennedy, S.A.; Dawson, M.L.; Hauser, R.M.

2003-01-01

401

Joint environmental assessment for western NPR-1 3-dimensional seismic project at Naval Petroleum Reserve No. 1, Kern County, California  

SciTech Connect

The Department of Energy (DOE), in conjunction with the Bureau of Land Management (BLM), has prepared an Environmental Assessment (DOE/EA-1124) to identify and evaluate the potential environmental impacts of the proposed geophysical seismic survey on and adjacent to the Naval Petroleum Reserve No.1 (NPR-1), located approximately 35 miles west of Bakersfield, California. NPR-1 is jointly owned and operated by the federal government and Chevron U.S.A. Production Company. The federal government owns about 78 percent of NPR-1, while Chevron owns the remaining 22 percent. The government`s interest is under the jurisdiction of DOE, which has contracted with Bechtel Petroleum Operations, Inc. (BPOI) for the operation and management of the reserve. The 3-dimensional seismic survey would take place on NPR-1 lands and on public and private lands adjacent to NPR-1. This project would involve lands owned by BLM, California Department of Fish and Game (CDFG), California Energy Commission (CEC), The Nature Conservancy, the Center for Natural Lands Management, oil companies (Chevron, Texaco, and Mobil), and several private individuals. The proposed action is designed to provide seismic data for the analysis of the subsurface geology extant in western NPR-1 with the goal of better defining the commercial limits of a currently producing reservoir (Northwest Stevens) and three prospective hydrocarbon bearing zones: the {open_quotes}A Fan{close_quotes} in Section 7R, the 19R Structure in Section 19R, and the 13Z Structure in Section 13Z. Interpreting the data is expected to provide NPR-1 owners with more accurate locations of structural highs, faults, and pinchouts to maximize the recovery of the available hydrocarbon resources in western NPR-1. Completion of this project is expected to increase NPR-1 recoverable reserves, and reduce the risks and costs associated with further exploration and development in the area.

NONE

1996-05-01

402

Geochronologic and geochemical data from Mesozoic rocks in the Black Mountain area northeast of Victorville, San Bernardino County, California  

USGS Publications Warehouse

We present geochronologic and geochemical data for Mesozoic rocks in the Black Mountain area northeast of Victorville, California, to supplement previous geologic mapping. These data, together with previously published results, limit the depositional age of the sedimentary Fairview Valley Formation to Early Jurassic, refine the ages and chemical compositions of selected units in the overlying Jurassic Sidewinder Volcanics and of related intrusive units, and limit the age of some post-Sidewinder faulting in the Black Mountain area to a brief interval in the Late Jurassic. The new information contributes to a more complete understanding of the Mesozoic magmatic and tectonic evolution of the western Mojave Desert and surrounding regions.

Stone, Paul; Barth, Andrew P.; Wooden, Joseph L.; Fohey-Breting, Nicole K.; Vazquez, Jorge A.; Priest, Susan S.

2013-01-01

403

Map of the Carpinteria area and vicinity, Santa Barbara County, California, showing water-level contours for March 1983, and net change in water level between March 1982 and March 1983  

USGS Publications Warehouse

A water-level contour map of the Carpinteria area, California, was constructed using 34 water-level measurements made by the Carpinteria County Water District in March 1983. Also shown on the map are five hydrographs that show water-level fluctuations in each well between 1978 and 1983. In addition, a water-level net-change map for March 1982 to March 1983 is shown. (USGS)

Moyle, W. R., Jr.

1984-01-01

404

Niland development project geothermal loan guaranty: 49-MW (net) power plant and geothermal well field development, Imperial County, California: Environmental assessment  

SciTech Connect

The proposed federal action addressed by this environmental assessment is the authorization of disbursements under a loan guaranteed by the US Department of Energy for the Niland Geothermal Energy Program. The disbursements will partially finance the development of a geothermal well field in the Imperial Valley of California to supply a 25-MW(e) (net) power plant. Phase I of the project is the production of 25 MW(e) (net) of power; the full rate of 49 MW (net) would be achieved during Phase II. The project is located on approximately 1600 acres (648 ha) near the city of Niland in Imperial County, California. Well field development includes the initial drilling of 8 production wells for Phase I, 8 production wells for Phase II, and the possible need for as many as 16 replacement wells over the anticipated 30-year life of the facility. Activities associated with the power plant in addition to operation are excavation and construction of the facility and associated systems (such as cooling towers). Significant environmental impacts, as defined in Council on Environmental Quality regulation 40 CFR Part 1508.27, are not expected to occur as a result of this project. Minor impacts could include the following: local degradation of ambient air quality due to particulate and/or hydrogen sulfide emissions, temporarily increased ambient noise levels due to drilling and construction activities, and increased traffic. Impacts could be significant in the event of a major spill of geothermal fluid, which could contaminate groundwater and surface waters and alter or eliminate nearby habitat. Careful land use planning and engineering design, implementation of mitigation measures for pollution control, and design and implementation of an environmental monitoring program that can provide an early indication of potential problems should ensure that impacts, except for certain accidents, will be minimized.

Not Available

1984-10-01

405

Emergency Assessment of Debris-Flow Hazards from Basins Burned by the 2007 Ranch Fire, Ventura and Los Angeles Counties, Southern California  

USGS Publications Warehouse

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 Ranch Fire in Ventura and Los Angeles Counties, 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.

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

406

Emergency Assessment of Debris-Flow Hazards from Basins Burned by the 2007 Slide and Grass Valley Fires, San Bernardino County, Southern California  

USGS Publications Warehouse

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 Slide and Grass Valley Fires in San Bernardino 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 3.50 inches (88.90 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.

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

407

40 CFR 62.1100 - Identification of plan.  

Code of Federal Regulations, 2011 CFR

...a) State of California Designated... ) Bay Area Air Quality Management...Humboldt County Air Pollution Control District...Shasta County Air Pollution Control District...Specific Air Contaminants...5) State of California's...

2011-07-01

408

40 CFR 62.1100 - Identification of plan.  

Code of Federal Regulations, 2012 CFR

...a) State of California Designated... ) Bay Area Air Quality Management...Humboldt County Air Pollution Control District...Shasta County Air Pollution Control District...Specific Air Contaminants...5) State of California's...

2012-07-01

409

40 CFR 62.1100 - Identification of plan.  

Code of Federal Regulations, 2013 CFR

...a) State of California Designated... ) Bay Area Air Quality Management...Humboldt County Air Pollution Control District...Shasta County Air Pollution Control District...Specific Air Contaminants...5) State of California's...

2013-07-01

410

40 CFR 62.1100 - Identification of plan.  

Code of Federal Regulations, 2010 CFR

...a) State of California Designated... ) Bay Area Air Quality Management...Humboldt County Air Pollution Control District...Shasta County Air Pollution Control District...Specific Air Contaminants...5) State of California's...

2010-07-01

411

A water-resources data-network evaluation for Monterey County, California; Phase 3, Northern Salinas River drainage basin  

USGS Publications Warehouse

This report evaluates existing data collection networks and possible additional data collection to monitor quantity and quality of precipitation, surface water, and groundwater in the northern Salinas River drainage basin, California. Of the 34 precipitation stations identified, 20 were active and are concentrated in the northwestern part of the study area. No precipitation quality networks were identified, but possible data collection efforts include monitoring for acid rain and pesticides. Six of ten stream-gaging stations are active. Two surface water quality sites are sampled for suspended sediment, specific conductance, and chloride; one U.S. Geological Survey NASOAN site and one site operated by California Department of Water Resources make up the four active sampling locations; reactivation of 45 inactive surface water quality sites might help to achieve objectives described in the report. Three local networks measure water levels in 318 wells monthly, during peak irrigation, and at the end of the irrigation season. Water quality conditions are monitored in 379 wells; samples are collected in summer to monitor saltwater intrusion near Castroville and are also collected annually throughout the study area for analysis of chloride, specific conductance, and nitrate. An ideal baseline network would be an evenly spaced grid of index wells with a density of one per section. When baseline conditions are established, representative wells within the network could be monitored periodically according to specific data needs. (USGS)

Templin, W.E.; Schluter, R.C.

1990-01-01

412

Preliminary Image Map of the 2007 Ammo Fire Perimeter, Las Pulgas Canyon Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

413

Preliminary Image Map of the 2007 Witch and Poomacha Fire Perimeters, Rodriguez Mountain Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

414

Preliminary Image Map of the 2007 Witch Fire Perimeter, Rancho Santa Fe Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

415

Preliminary Image Map of the 2007 Witch Fire Perimeter, San Vicente Reservoir Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

416

Preliminary Image Map of the 2007 Witch Fire Perimeter, El Cajon Mountain Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

417

Preliminary Image Map of the 2007 Witch and Poomacha Fire Perimeters, Mesa Grande Quadrangle, San Diego County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

418

Preliminary Image Map of the 2007 Grass Valley Fire Perimeter, Lake Arrowhead Quadrangle, San Bernardino County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

419

Preliminary Image Map of the 2007 Cajon Fire Perimeter, San Bernardino North Quadrangle, San Bernardino County, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

420

Preliminary Image Map of the 2007 Poomacha Fire Perimeter, Temecula Quadrangle, Riverside and San Diego Counties, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

421

Preliminary Image Map of the 2007 Poomacha Fire Perimeter, Pechanga Quadrangle, Riverside and San Diego Counties, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

422

Preliminary Image Map of the 2007 Poomacha Fire Perimeter, Vail Lake Quadrangle, Riverside and San Diego Counties, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01

423

Preliminary Image Map of the 2007 Ranch and Magic Fire Perimeters, Val Verde Quadrangle, Los Angeles and Ventura Counties, California  

USGS Publications Warehouse

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.

Clark, Perry S.; Scratch, Wendy S.; Bias, Gaylord W.; Stander, Gregory B.; Sexton, Jenne L.; Krawczak, Bridgette J.

2008-01-01