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U.S. GEOLOGICAL SURVEY
Data Series 285 (ver 1.1, August 2018)

Ground-Water Quality Data in the Southern Sacramento Valley, California, 2005—Results from the California GAMA Program

Prepared in cooperation with the California State Water Resources Control Board

By Barbara J. Milby Dawson, George L. Bennett V, and Kenneth Belitz

Download the report (PDF, 5 MB)

Figures

Figure 1. Hydrogeologic provinces of California and the location of the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit.

Figure 2. Locations of the six study areas in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit.

Figure 3. Study areas, location of wells sampled, well numbers, and distribution of study area grid cells in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit.

Figure 4. Nitrate concentrations in ground water in the study areas of the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit.

Figure 5. Arsenic concentrations in ground water in the study areas of the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit.

Figure 6. Barium concentrations in ground water in the study areas of the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit.

Figure 7. Boron concentrations in ground water in the study areas of the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit.

Figure 8. Iron concentrations in ground water in the study areas of the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit.

Figure 9. Manganese concentrations in ground water in the study areas of the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit.

Figure 10. Radon-222 concentrations in ground water in the study areas of the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit.

Tables (available in PDF format)

Table 1. Constituents and water-quality parameters collected for the slow, intermediate, fast, and depth-dependent sampling lists in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 2. Well information for sampled wells in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 3A. Volatile organic compounds measured in ground water in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 3B. Pesticide compounds measured in ground-water samples from all wells in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 3C. Pesticide compounds measured in ground-water samples from 43 wells in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 3D. Constituents of special interest measured in ground-water samples in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 3E. Nutrient constituents and dissolved organic carbon measured in ground-water samples in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005

Table 3F. Major ions and trace inorganic constituents measured in ground-water samples in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 3G. Isotopic constituents and radioactive parameters measured in ground-water samples in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 3H. Tritium and noble gases measured in ground-water samples from the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005, and analyzed by the Lawrence Livermore National Laboratory.

Table 3I. Iron, arsenic, and chromium speciation results from ground-water samples in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 3J. Microbial constituents measured in ground-water samples in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 4. Analytical methods used for chemical and microbial constituents in ground-water samples collected in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 5. Summary of surrogate compound recoveries for ground-water and quality assurance analyses of volatile organic compounds, gasoline oxygenates, pesticides and pesticide degradates, and special interest compound samples collected for the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 6. Quality-control summary for constituents detected in field blanks and ground-water samples collected for the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 7. Constituents with relative standard deviations greater than 20 percent for replicate quality-control samples collected in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 8A. Laboratory matrix spike results from ground water collected in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005: constituents with low recoveries.

Table 8B. Laboratory matrix spike results from ground water collected in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005: constituents with high recoveries.

Table 9. General water-quality parameters measured or calculated in ground-water samples from the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 10A. Volatile organic compounds detected in ground-water samples collected in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 10B. Detection frequency of volatile organic compounds detected in ground-water samples collected in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 11. Tentatively identified organic compounds found in ground water samples in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 12A. Pesticide compounds detected in ground-water samples collected from all wells in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 12B. Additional pesticide compounds detected in ground-water samples collected from selected wells in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 12C. Detection frequencies of pesticides detected in ground-water samples collected from grid wells in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 13. Nutrient constituents detected in ground-water samples collected in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 14. Major ions detected in ground-water samples collected in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 15. Trace inorganic elements detected in ground-water samples collected in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 16. Constituents of special interest and chromium, arsenic, and iron speciation results in ground-water samples collected in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 17. Analysis of isotopes and radioactivity in ground-water samples collected in the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

Table 18. Tritium and noble gas concentrations in ground-water samples collected from the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005, and analyzed by the Lawrence Livermore National Laboratory.

Table 19. Microbial constituents detected in ground-water samples collected for the Southern Sacramento Valley Ground-Water Ambient Monitoring and Assessment (GAMA) study unit, California, 2005.

This report is available online in Portable Document Format (PDF). If you do not have the Adobe Acrobat PDF Reader, it is available for free download from Adobe Systems Incorporated.

Download the report (PDF, 5 MB)

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Send questions or comments about this report to the author, Barbara Dawson , (916) 278-3082.

For more information about USGS activities in California, visit the USGS California Water Science Center home page.