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Temescal Basin Groundwater Sustainability Plan

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Temescal Basin Groundwater Sustainability Plan TEMESCAL BASIN GROUNDWATER SUSTAINABILITY PLAN DRAFT HYDROGEOLOGIC CONCEPTUAL MODEL AND GROUNDWATER CONDITIONS February 2021 This page is intentionally blank. Draft Temescal Basin GSP TODD GROUNDWATER Table of Contents Hydrogeological Conceptual Model .............................................................................. 3-1 3.1. Physical Setting and Topography ........................................................................... 3-1 3.2. Surface Water Features ......................................................................................... 3-2 3.3. Soils ........................................................................................................................ 3-2 3.4. Geologic Setting ..................................................................................................... 3-3 3.5. Faults ...................................................................................................................... 3-3 3.6. Aquifers .................................................................................................................. 3-3 3.6.1. Description of Principal Aquifer Units ............................................................ 3-4 3.6.2. Description of Lateral Boundaries ................................................................. 3-6 3.7. Structures Affecting Groundwater ......................................................................... 3-6 3.8. Definable Basin Bottom ......................................................................................... 3-7 3.9. Recharge and Discharge Areas ............................................................................... 3-7 3.10. Primary Groundwater Uses ................................................................................ 3-8 3.11. Data Gaps in the Hydrogeologic Conceptual Model .......................................... 3-8 Current and Historical Groundwater Conditions ........................................................... 4-1 4.1. Groundwater Elevations ........................................................................................ 4-1 4.1.1. Available Data ................................................................................................ 4-1 4.1.2. Groundwater Occurrence .............................................................................. 4-1 4.1.3. Groundwater Elevations and Trends ............................................................. 4-2 4.1.4. Groundwater Flow ......................................................................................... 4-3 4.1.5. Vertical Groundwater Gradients .................................................................... 4-4 4.2. Changes In Groundwater Storage .......................................................................... 4-4 4.3. Land Subsidence and Potential for Subsidence ..................................................... 4-5 4.3.1. Interferometric Synthetic Aperture Radar (InSAR) ........................................ 4-6 4.4. Groundwater Quality ............................................................................................. 4-6 4.5. Key Constituents of Concern .................................................................................. 4-8 4.5.1. Total Dissolved Solids (TDS) ........................................................................... 4-9 4.5.2. Nitrate as Nitrate (NO3).................................................................................. 4-9 Draft Temescal Basin GSP i TODD GROUNDWATER 4.6. Other Constituents ................................................................................................. 4-9 4.6.1. Naturally Occurring Contaminants .............................................................. 4-10 4.6.2. Emerging contaminants ............................................................................... 4-11 4.6.3. Monitoring Networks ................................................................................... 4-12 4.7. Threats to Water Quality ..................................................................................... 4-12 4.7.1. Regulated Facilities ...................................................................................... 4-12 4.7.2. Septic Systems ............................................................................................. 4-12 4.7.3. Non-point Sources ....................................................................................... 4-13 4.8. Vertical Variations in Water Quality .................................................................... 4-13 4.9. Seawater Intrusion Conditions ............................................................................. 4-13 4.10. Interconnection of Surface Water and Groundwater ...................................... 4-13 4.10.1. Stream Flow Measurements ........................................................................ 4-14 4.10.2. Depth to Groundwater................................................................................. 4-15 4.10.3. Riparian Vegetation ..................................................................................... 4-17 4.10.4. Wetlands and Interconnected Surface Water ............................................. 4-18 4.10.5. Animals and Interconnected Surface Water ................................................ 4-22 References .......................................................................................................................... Ref 1 List of Figures (following text) Section 3 Figures Figure 3-1 Basin Topography Figure 3-2 Tributary Surface Water in Basin Figure 3-3 Watersheds Tributary to Basin Figure 3-4 Basin Soil Hydrologic Properties Figure 3-5 Surficial Geology Figure 3-6 Cross Section Line Orientation Figure 3-7 Cross Section A to A’ Figure 3-8 Cross Section B to B’ Figure 3-9 Cross Section C to C’ Figure 3-10 Channel Aquifer Extent and Hydraulic Conductivity Figure 3-11 Depth to Bedrock Draft Temescal Basin GSP ii TODD GROUNDWATER Figure 3-12 Groundwater Recharge and Discharge (to be completed after numerical model construction) Section 4 Figures Figure 4-1 Historically Monitored Wells Figure 4-2 Representative Hydrographs City of Corona Well 15 Figure 4-3 Representative Hydrographs City of Corona Well 11 Figure 4-4 Representative Hydrographs City of Corona Well 22 Figure 4-5 Representative Hydrographs City of Corona Well 19 Figure 4-6 Representative Hydrographs City of Corona Well 26 Figure 4-7 Representative Hydrographs City of Corona Well 17A Figure 4-8 Representative Hydrographs City of Corona Well 8A Figure 4-9 Representative Hydrographs City of Corona Well 13 Figure 4-10 Groundwater Elevation Contours, Fall 2015 Figure 4-11 Groundwater Elevation Contours, Spring 2017 Figure 4-12 Concepts of Land Subsidence Figure 4-13 Basin-Wide Subsidence Estimates from Satellite Measurements Figure 4-14 Wells with Water Quality Data Figure 4-15 Total Dissolved Solids Concentrations in Wells, Water Years 2011 through 2019 Figure 4-16 Nitrate Concentrations in Wells, Water Years 2011 through 2019 Figure 4-17 Regional Surface Water Features Figure 4-18 Stream Flow at Four Gages Figure 4-19 Temescal Wash Flow and Reclaimed Water Discharge Figure 4-20 Depth to Water Spring 2017 Figure 4-21 Critical Habitat Areas Figure 4-22 Historical Maximum Depth to Water Near Prado Wetlands Figure 4-23 Factors Related to Prado Wetland Groundwater Levels Appendices (following text) Appendix E – Numerical Groundwater Model Documentation Report (to be added later) Draft Temescal Basin GSP iii TODD GROUNDWATER Acronyms 1,2,3-TCP 1,2,3- Trichloropropane Basin Temescal Subbasin CASGEM California Statewide Groundwater Elevation Monitoring cfs cubic feet per second COC constituent of concern Corona City of Corona DDW State Water Resources Control Board Division of Drinking Water DWR California Department of Water Resources DWSAP Drinking Water Source Water Assessment Program ET evapotranspiration ft/day foot per day GAMA Groundwater Ambient Monitoring and Assessment GDE groundwater dependent ecosystem gpd/ft2 gallons per day per square foot GSA Groundwater Sustainability Agency GSP Groundwater Sustainability Plan InSAR Interferometric Synthetic Aperture Radar K hydraulic conductivity LSCE Luhdorff and Scalmanini Consulting Engineers MCL Maximum Contaminant Level mg/L milligrams per liter mi2 square miles MSHCP Western Riverside County Multiple Species Habitat Conservation Plan msl mean sea level NCCAG Natural Communities Commonly Associated with Groundwater NDMI Normalized Difference Moisture Index NDVI Normalized Difference Vegetation Index NO3 nitrate NPS nonpoint source NRCS U.S. Department of Agriculture, Natural Resources Conservation Service NWIS National Water Information System OWTS On-Site Wastewater Treatment System pCi/L picocuries per liter PFAS per- and polyfluoroalkyl substances PFOA perfluorooctanoic acid Draft Temescal Basin GSP iv TODD GROUNDWATER PFOS perfluorooctane sulfonate ppt parts per trillion RWQCB Santa Ana Regional Water Quality Control Board SGMA Sustainable Groundwater Management Act SMCL Secondary maximum contaminant level SSURGO Soil Survey Geographic Database SWRCB State Water Resources Control Board TDS total Dissolved Solids µg/L micrograms per liter USDA United States Department of Agriculture USEPA United State Environmental Protection Agency USGS United States Geological Survey Draft Temescal Basin GSP v TODD GROUNDWATER This page is intentionally blank. Draft Temescal Basin GSP vi TODD GROUNDWATER HYDROGEOLOGICAL CONCEPTUAL MODEL
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