Groundwater Quality Data for the Tahoe–Martis Study Unit, 2007: Results from the California GAMA Program
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In cooperation with the California State Water Resources Control Board A product of the California Groundwater Ambient Monitoring and Assessment (GAMA) Program Groundwater Quality Data for the Tahoe–Martis Study Unit, 2007: Results from the California GAMA Program Data Series 432 U.S. Department of the Interior U.S. Geological Survey Cover Photographs: Top: Lake Tahoe shoreline, 2007. (Photograph taken by Cathy M. Munday, U.S. Geological Survey.) Bottom: Sampling point, 2007. (Photograph taken by Mike Judd, U.S. Geological Survey.) Groundwater Quality Data for the Tahoe–Martis Study Unit, 2007: Results from the California GAMA Program By Miranda S. Fram, Cathy Munday, and Kenneth Belitz In cooperation with the California State Water Resources Control Board Data Series 432 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey Suzette M. Kimball, Acting Director U.S. Geological Survey, Reston, Virginia: 2009 For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod To order this and other USGS information products, visit http://store.usgs.gov Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report. Suggested citation: Fram, M.S., Munday, Cathy, and Belitz, Kenneth, 2009, Groundwater quality data for the Tahoe–Martis study unit, 2007: Results from the California GAMA Program: U.S. Geological Survey Data Series 432, 88 p. Available at http://pubs.usgs.gov/ds/432/ iii Contents Abstract ..........................................................................................................................................................1 Introduction ....................................................................................................................................................2 Purpose and Scope ..............................................................................................................................4 Hydrogeologic Setting ........................................................................................................................4 Tahoe Study Area .........................................................................................................................7 Martis Study Area ........................................................................................................................8 Hard Rock Study Area .................................................................................................................8 Methods ..........................................................................................................................................................8 Study Design ..........................................................................................................................................8 Sample Collection and Analysis .........................................................................................................9 Data Reporting.....................................................................................................................................10 Quality Assurance...............................................................................................................................10 Water-Quality Results ................................................................................................................................10 Quality-Control Results ......................................................................................................................10 Comparison Thresholds .....................................................................................................................10 Groundwater Quality Data .................................................................................................................11 Field Water-Quality Indicators .................................................................................................12 Organic Constituents .................................................................................................................12 Inorganic Constituents ..............................................................................................................12 Isotopic Tracers .........................................................................................................................13 Radioactive Constituents ..........................................................................................................13 Future Work ..................................................................................................................................................14 Summary .......................................................................................................................................................14 Acknowledgments .......................................................................................................................................15 References Cited..........................................................................................................................................15 Tables ...........................................................................................................................................................21 Appendix........................................................................................................................................................60 Appendix Tables ...........................................................................................................................................73 iv Figures Figure 1. Map of the 10 hydrogeologic provinces of California and the location of the Tahoe–Martis Groundwater Ambient Monitoring and Assessment (GAMA) study unit ...................................................................................................................................3 Figure 2. Map of the Tahoe–Martis Groundwater Ambient Monitoring and Assessment (GAMA) study unit, and locations of groundwater basins, major cities, major hydrologic features, and the surface-water watershed area for Lake Tahoe and the Tahoe and Martis Valley groundwater basins, California ...................................5 Figure 3. Map of the northern (A) and southern (B) parts of the Tahoe–Martis Groundwater Ambient Monitoring and Assessment (GAMA) study unit, California, and the distribution of the study area grid cells, and locations of the sampled grid wells and the understanding wells ....................................................6 Tables Table 1. Well identification, and sampling and construction information for wells sampled for the Tahoe–Martis Groundwater Ambient Monitoring and Assessment (GAMA) study, California, June–September, 2007 .............................................................22 Table 2. Classes of chemical and microbial constituents and water-quality indicators collected for the slow and intermediate sampling schedules for the Tahoe–Martis Groundwater Ambient Monitoring and Assessment (GAMA) study, California, June–September, 2007 ...........................................................................................................24 Table 3A. Volatile organic compounds and gasoline additives, primary uses or sources, comparative thresholds, and reporting information for the U.S. Geological Survey (USGS) National Water Quality Laboratory Schedule 2020 ..............................................25 Table 3B. Gasoline oxygenates and degradates, primary uses or sources, comparative thresholds, and reporting information for the U.S. Geological Survey (USGS) National Water Quality Laboratory Schedule 4024 ............................................................28 Table 3C. Pesticides and pesticide degradates, primary uses or sources, comparative thresholds, and reporting information for the U.S. Geological Survey (USGS) National Water Quality Laboratory Schedule 2003 ............................................................29 Table 3D. Pharmaceutical compounds, primary uses or sources, comparative thresholds, and reporting information for the U.S. Geological Survey (USGS) National Water Quality Laboratory schedule 2080 .........................................................................................31 Table 3E. Constituents of special interest, primary uses or sources, comparative thresholds, and reporting information for the Montgomery Watson Harza and Weck Laboratories ..................................................................................................................32 Table 3F. Nutrients and dissolved organic carbon, comparative thresholds, and reporting information for the U.S. Geological Survey (USGS) National Water Quality Laboratory Schedule 2755 ......................................................................................................32 Table 3G. Major and minor ions and trace elements, comparative thresholds, and reporting information for the U.S. Geological Survey (USGS) National Water Quality