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Book Status and Understanding of Groundwater Quality in the Sierra Nevada Regional Study Unit 2008

Download or read book Status and Understanding of Groundwater Quality in the Sierra Nevada Regional Study Unit 2008 written by Miranda Susan Fram and published by . This book was released on 2014 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater quality in the Sierra Nevada Regional (SNR) study unit was investigated as part of the California State Water Resources Control Board's Groundwater Ambient Monitoring and Assessment Program Priority Basin Project. The study was designed to provide statistically unbiased assessments of the quality of untreated groundwater within the primary aquifer system of the Sierra Nevada. The primary aquifer system for the SNR study unit was delineated by the depth intervals over which wells in the State of California's database of public drinking-water supply wells are open or screened. Two types of assessments were made: (1) a status assessment that described the current quality of the groundwater resource, and (2) an evaluation of relations between groundwater quality and potential explanatory factors that represent characteristics of the primary aquifer system. The assessments characterize untreated groundwater quality, rather than the quality of treated drinking water delivered to consumers by water distributors. The status assessment was based on water-quality data collected by the U.S. Geological Survey from 83 wells in the SNR study unit in 2008 and from 117 wells in 3 small study units within the SNR study unit in 2006-07 and on water-quality data compiled in the State's database for 1,066 wells sampled in 2006-08. To provide some context for the results, water-quality data were converted to relative-concentrations (RCs), which are the sample concentrations divided by the concentrations of Federal or California regulatory and non-regulatory benchmarks for drinking-water quality. RCs for inorganic constituents (major ions, trace elements, nutrients, and radioactive constituents) were classified as "high" (RC > 1.0, indicating that concentration is above the benchmark), "moderate" (1.0 ≥ RC > 0.5), or "low" (RC ≤ 0.5). For organic constituents (volatile organic compounds and pesticides) and special-interest constituents (perchlorate and N-nitrosodimethylamine [NDMA]), the boundary between moderate and low RCs was set at 0.1. All benchmarks used for organic constituents were health-based, whereas health-based and aesthetic-based benchmarks were used for inorganic constituents. The primary metric used for quantifying regional-scale groundwater quality was "aquifer-scale proportion." Aquifer-scale proportions were calculated as the areal percentages of the primary aquifer system having high, moderate, and low RCs for a given constituent or class of constituents. The SNR study unit area was classified into four aquifer lithologic types--granitic rocks, metamorphic rocks, sedimentary deposits, and volcanic rocks--and aquifer-scale proportions were calculated on an area-weighted basis for each of the four aquifer lithologies and for the study unit as a whole (aggregated system). The results of the status assessment indicated that inorganic constituents were present at high and moderate RCs in greater proportions in the SNR study unit aggregated primary aquifer system than were organic constituents and that there were significant differences (p

Book Status and Understanding of Groundwater Quality in the Northern Sierra Nevada Foothills Domestic Supply Aquifer Study Units 2015 17

Download or read book Status and Understanding of Groundwater Quality in the Northern Sierra Nevada Foothills Domestic Supply Aquifer Study Units 2015 17 written by Zeno Levy and published by . This book was released on 2021 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Status and Understanding of Groundwater Quality in the South Coast Range Coastal Study Unit 2008

Download or read book Status and Understanding of Groundwater Quality in the South Coast Range Coastal Study Unit 2008 written by Carmen A. Burton and published by CreateSpace. This book was released on 2014-08-01 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater quality in the approximately 653-square-mile (1,691-square-kilometer) South Coast Interior Basins (SCI) study unit was investigated as part of the Priority Basin Project of the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The South Coast Interior Basins study unit contains eight priority groundwater basins grouped into three study areas, Livermore, Gilroy, and Cuyama, in the Southern Coast Ranges hydrogeologic province. The GAMA Priority Basin Project is being conducted by the California State Water Resources Control Board in collaboration with the U.S. Geological Survey (USGS) and the Lawrence Livermore National Laboratory. The GAMA South Coast Interior Basins study was designed to provide a spatially unbiased assessment of untreated (raw) groundwater quality within the primary aquifer system, as well as a statistically consistent basis for comparing water quality between basins. The assessment was based on water-quality and ancillary data collected by the USGS from 50 wells in 2008 and on water-quality data from the California Department of Public Health (CDPH) database. The primary aquifer system was defined by the depth intervals of the wells listed in the CDPH database for the SCI study unit. The quality of groundwater in the primary aquifer system may be different from that in the shallower or deeper water-bearing zones; shallow groundwater may be more vulnerable to surficial contamination. The first component of this study, the status of the current quality of the groundwater resource, was assessed by using data from samples analyzed for volatile organic compounds (VOCs), pesticides, and naturally occurring inorganic constituents, such as trace elements and minor ions. This status assessment is intended to characterize the quality of groundwater resources within the primary aquifer system of the SCI study unit, not the treated drinking water delivered to consumers by water purveyors. Relative-concentrations (sample concentration divided by the health- or aesthetic-based benchmark concentration) were used for evaluating groundwater quality for those constituents that have Federal or California regulatory or non-regulatory benchmarks for drinking-water quality. A relative-concentration greater than 1.0 indicates a concentration greater than a benchmark, and a relative-concentration less than or equal to 1.0 indicates a concentration equal to or less than a benchmark. Relative-concentrations of organic constituents and special-interest constituents were classified as "high" (relative-concentration greater than 1.0), "moderate" (relative-concentration greater than 0.1 and less than or equal to 1.0), or "low" (relative-concentration less than or equal to 0.1). Relative-concentrations of inorganic constituents were classified as "high" (relative-concentration greater than 1.0), "moderate" (relative-concentration greater than 0.5 and less than or equal to 1.0), or "low" (relative-concentration less than or equal to 0.5).

Book Status and Understanding of Groundwater Quality in the Madera Chowchilla Study Unit 2008

Download or read book Status and Understanding of Groundwater Quality in the Madera Chowchilla Study Unit 2008 written by Jennifer L. Shelton and published by CreateSpace. This book was released on 2013 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater quality in the approximately 860-square-mile Madera and Chowchilla Subbasins (Madera-Chowchilla study unit) of the San Joaquin Valley Basin was investigated as part of the Priority Basin Project of the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The study unit is located in California's Central Valley region in parts of Madera, Merced, and Fresno Counties. The GAMA Priority Basin Project is being conducted by the California State Water Resources Control Board in collaboration with the U.S. Geological Survey (USGS) and the Lawrence Livermore National Laboratory. The Project was designed to provide statistically robust assessments of untreated groundwater quality within the primary aquifer systems in California. The primary aquifer system within each study unit is defined by the depth of the perforated or open intervals of the wells listed in the California Department of Public Health (CDPH) database of wells used for municipal and community drinking-water supply. The quality of groundwater in shallower or deeper water-bearing zones may differ from that in the primary aquifer system; shallower groundwater may be more vulnerable to contamination from the surface.

Book Status and Understanding of Groundwater Quality in the Two Southern San Joaquin Valley Study Units 2005 2006

Download or read book Status and Understanding of Groundwater Quality in the Two Southern San Joaquin Valley Study Units 2005 2006 written by Carmen A. Burton and published by CreateSpace. This book was released on 2014-07-10 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater quality in the southern San Joaquin Valley was investigated from October 2005 through March 2006 as part of the Priority Basin Project of the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The GAMA Priority Basin Project is conducted by the U.S. Geological Survey (USGS) in collaboration with the California State Water Resources Control Board and the Lawrence Livermore National Laboratory. There are two study units located in the southern San Joaquin Valley: the Southeast San Joaquin Valley (SESJ) study unit and the Kern County Subbasin (KERN) study unit.

Book Status and Understanding of Groundwater Quality in the Tahoe Martis Central Sierra and Southern Sierra Study Units 2006 2007

Download or read book Status and Understanding of Groundwater Quality in the Tahoe Martis Central Sierra and Southern Sierra Study Units 2006 2007 written by Miranda Susan Fram and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Groundwater Quality in the Central Sierra Nevada Claifornia

Download or read book Groundwater Quality in the Central Sierra Nevada Claifornia written by and published by . This book was released on 2012 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Groundwater quality in the southern Sierra Nevada California

Download or read book Groundwater quality in the southern Sierra Nevada California written by Miranda Susan Fram and published by . This book was released on 2012 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Groundwater quality Data in the Santa Cruz San Gabriel and Peninsular Ranges Hard Rock Aquifers Study Unit 2011 2012

Download or read book Groundwater quality Data in the Santa Cruz San Gabriel and Peninsular Ranges Hard Rock Aquifers Study Unit 2011 2012 written by Tracy A. Davis and published by . This book was released on 2014 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Status of Groundwater Quality in the California Desert Region 2006 2008

Download or read book Status of Groundwater Quality in the California Desert Region 2006 2008 written by Barbara J. Milby Dawson and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: