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TABLE OF CONTENTS TABLE OF CONTENTS PREFACE ............................................................................................................. 1 SECTION 1.0 INTRODUCTION ....................................................................... 6 1.1 Background .......................................................................................................................................... 6 1.2 Stakeholder Interest and Plan Format ............................................................................................. 6 1.3 Objectives of GMP ............................................................................................................................. 8 1.4 GMP Timeline and Development Process ..................................................................................... 9 1.5 Elements of the SEBP Basin GMP .................................................................................................. 9 1.6 Document Development ................................................................................................................... 9 1.7 Authority To Prepare and Implement A GMP ............................................................................ 11 1.8 Groundwater Management Plan Components ............................................................................. 11 1.9 SEBP Groundwater Management Plan Structure ........................................................................ 12 SECTION 2.0 WATER RESOURCES SETTING ............................................. 14 2.1 Overview of SEBP Groundwater Basin ........................................................................................ 14 2.2 Historical Groundwater Use in the East Bay Area ...................................................................... 14 2.3 Groundwater Basin Delineation ..................................................................................................... 15 2.4 Topography and Geomorphic Features ........................................................................................ 17 2.5 Soils ..................................................................................................................................................... 17 2.5.1 Type A Soils ........................................................................................................................... 17 2.5.2 Type B Soils ........................................................................................................................... 17 2.5.3 Type C Soils ........................................................................................................................... 17 2.5.4 Type D Soils ........................................................................................................................... 19 2.6 Surface Water Features .................................................................................................................... 19 2.6.1 San Leandro Creek ................................................................................................................ 19 2.6.2 San Lorenzo Creek ................................................................................................................ 19 2.7 Precipitation ....................................................................................................................................... 19 2.8 Land Use ............................................................................................................................................ 20 2.9 Flood Plain Delineation ................................................................................................................... 22 2.10 Hydrogeologic Setting .................................................................................................................... 24 2.10.1 Geologic History ................................................................................................................. 25 2.10.2 Mesozoic Through Early Cenozoic Basement Rocks Formed During Subduction of the Farallon Plate ........................................................................................................... 25 South East Bay Plain Basin Groundwater Management Plan TOC - 1 March 2013 TABLE OF CONTENTS 2.10.3 Mid-Cenozoic Rocks Formed Prior to the Existence of the San Francisco Bay Lowlands ......................................................................................................................... 29 2.10.4 Plio-Pleistocene Fluvial Deposits Formed After Creation of the San Francisco Bay Lowlands ......................................................................................................................... 29 2.10.5 Late Pleistocene Through Holocene Alluvial, Estuarine and Eolian Deposits ......... 29 2.11 Geologic Structure .......................................................................................................................... 33 2.12 Hydrogeologic Units ...................................................................................................................... 40 2.12.1 Development of Updated Hydrogeologic Cross Sections ............................................ 42 2.12.2 Deep Aquifer Hydraulic Properties .................................................................................. 45 2.13 Groundwater Elevations and Flow .............................................................................................. 47 2.14 Groundwater Quality ..................................................................................................................... 50 2.14.1 General Chemistry .............................................................................................................. 50 2.14.2 Regional Hydrogeologic Investigation, South East Bay Plain (CH2MHill, 2000) ..... 50 2.14.3 Threats to Water Quality .................................................................................................... 56 2.15 Groundwater Recharge .................................................................................................................. 56 2.16 Groundwater Rights in California ................................................................................................ 61 SECTION 3.0 GROUNDWATER MANAGEMENT PLAN ELEMENTS ... 63 3.1 Groundwater Management Goals .................................................................................................. 63 3.2 Basin Management Objectives ........................................................................................................ 63 3.3 GMP Components ........................................................................................................................... 64 3.3.1 Stakeholder Involvement ................................................................................................. 64 3.3.2 Monitoring Programs ....................................................................................................... 66 3.3.3 Groundwater Basin Management Tools ........................................................................ 73 3.3.4 Groundwater Resource Protection ................................................................................. 74 3.3.5 Groundwater Sustainability ............................................................................................. 79 SECTION 4.0 PLAN IMPLEMENTATION AND INTEGRATION ............ 88 4.1 Periodic GMP Implementation Meetings ..................................................................................... 88 4.2 Future Review of the SEBP Basin GMP ...................................................................................... 91 4.3 Financing ............................................................................................................................................ 91 4.4 Integrated Water Resources Management..................................................................................... 92 South East Bay Plain Basin Groundwater Management Plan TOC - 2 March 2013 TABLE OF CONTENTS APPENDICES − Appendix A: Resolution of Intent − Appendix B: San Lorenzo Creek Watershed Map and Stream Flow Summaries − Appendix C: Flood Delineation Map Inserts − Appendix D: Updated Cross Sections and Documentation of Methodology − Appendix E: Water Quality Tables − Appendix F: Monitoring Guidelines − Appendix G: Water Quality Sampling Plan − Appendix H: Well Standards REFERENCES South East Bay Plain Basin Groundwater Management Plan TOC - 3 March 2013 This page intentionally left blank. ACRONYMS ACRONYMS ACWD Alameda County Water District ABAG Association of Bay Area Governments AFY acre-ft per year AHGW Arc Hydro Groundwater ASR Aquifer Storage and Recovery CSM Conceptual Site Model DEIR Draft Environmental Impact Report DWR Department of Water Resources EBMUD East Bay Municipal Utility District EIR Environmental Impact Report FEMA Federal Emergency Management Agency ftp File Transfer Protocol GIS Geographic Information System gpd/ft gallons per day per foot GMP Groundwater Management Plan IGSM Integrated Groundwater and Surface Water Model LSCE Luhdorff & Scalmanini Consulting Engineers msl mean sea level NWIS National Water Information System NCGB Niles Cone Groundwater Basin NEBIGSM Niles Cone and South East Bay Plain Integrated Groundwater and Surface Water Model OLSD Oro Loma Sanitary District SB Senate Bill SEBP Basin South East Bay Plain Basin SSM Soil Survey Manual SWRCB State Water Resources Control Board