South Bay Basins Groundwater Protection Evaluation
Alec Naugle, PG
Engineering Geologist
California Regional Water Quality Control Board
San Francisco Bay Region
1515 Clay Street, Suite 1400
Oakland, CA 94612
Phone 510-622-2510
Fax 510-622-2460
Email ANaugle@waterboards.ca.gov
Download the report in PDF format:
Full Report with figures (33mb)
Report w/o figures (7.6mb)Figures, Plates & Appendices (PDF):
Figure 1 Location Map With Groundwater Basin and City and County Boundaries
Figure 2 Municipal Supply Drinking Water Wells in the South Bay Basins
Figure 3 Surficial Geology
Figure 4 Surface Watershed Boundaries, Streams, and Surface Water Bodies
Figure 5 Map of Niles Cone Groundwater Basin
Figure 6 Niles Cone Groundwater Basin Cross-section Schematic
Figure 7 Map of Santa Clara Valley Groundwater Basin
Figure 8A Santa Clara Valley Groundwater Basin Cross-section Schematic (North)
Figure 8B Santa Clara Valley Groundwater Basin Cross-section Schematic (South)
Figure 9 Map of San Mateo Plain Groundwater Basin
Figure 10 San Mateo Plain Conceptual Model of Alluvial Fan Deposition
Figure 11 Historical Groundwater Production in the Niles Cone Groundwater Basin
Figure 12 Comparison of 250 ppm Chloride Contours - Newark Aquifer
Figure 13 Comparison of 250 ppm Chloride Contours - Centerville-Fremont Aquifer
Figure 14 Comparison of 250 ppm Chloride Contours - Deep Aquifer
Figure 15 Map of Total Dissolved Solids - Newark Aquifer, Niles Cone Basin
Figure 16 Map of Total Dissolved Solids - Centerville-Fremont Aquifer, Niles Cone Basin
Figure 17 Map of Total Dissolved Solids - Deep Aquifer, Niles Cone Basin
Figure 18 Saltwater Intrusion in the Upper Aquifer System of the Santa Clara Valley Basin
Figure 19 Public Water Supply Wells Reported to Have Nitrate Above the MCL
Figure 20 Wells Reported to Contain Manganese Greater Than the MCL
Figure 21 Map of Leaking Underground Storage Tank Sites (Open and Closed)
Figure 22 Map of Significant VOC Plumes and Other Non-LUFT Sites
Figure 23 Local Map of VOC Plumes in a Portion of the City of Sunnyvale
Figure 24 Map of Landfills (Active and Inactive)
Figure 25 EPA and DTSC Lead Sites
Figure 26 Priority Areas for Groundwater Cleanup
Figure 27 Schematic Cross Section Illustrating Potential Vertical Conduit Conditions
Figure 28 Map of Known Vertical Conduits
Figure 29 Average Maximum Levels of Total CVOCs, TCE, and Vinyl Chloride
Figure 30 Maximum Levels of TCE in Groundwater
Plate 1. Geologic Cross Section of San Mateo Basin, Highway 92 (I-280 to San Francisco Bay) and Highway 84 (I-280 to San Francisco Bay)
APPENDIX A. List of Attendees at May 2000 Stakeholder Meetings, San Francisco Bay Regional Water Quality Control Board (available upon request)
Plate 2. Geologic Cross Section of San Mateo Basin, Bayshore Highway San Mateo Golf Club to Pulgas Avenue)
Plate 3 Geologic Cross Section of San Mateo Basin, El Camino Real (Sanchez Creek to San Francisquito Creek)APPENDIX B. South Bay Geology
APPENDIX C. Geology of the San Francisquito Cone Area
APPENDIX D. Federal Groundwater Protection and Cleanup Programs
APPENDIX E. State and Local Groundwater Protection and Cleanup Programs
APPENDIX F. Contact Information for South Bay General Plans and Groundwater Protection Strategies in South Bay General Plans
APPENDIX G. Guidelines for the Identification, Location, and Evaluation of Deep Well Conduits
APPENDIX H. An Evaluation of the Potential for Exfiltration from the City of Sunnyvale Sewer System
APPENDIX I. Response to Comments on the December 2001 Stakeholder Draft Report
Last updated 2/06/07
