Table of Contents
Figure 6-4: Locations of Imported Water Deliveries ..................................................... 6-3 Figure 6-5: OCWD Surface Water Recharge Facilities ................................................ 6-4 Figure 9-1: Shallow Aquifer Water Level Change, June 2020 to June 2021 ................9-3 Figure 9-2: Principal Aquifer Water Level Change, June 2020 to June 2021 ...............9-4 Figure 9-3: Deep Aquifer Water Level Change, June 2020 to June 2021 ....................9-5 Figure 11-1: Estimated TDS Concentration in Base Case for 30-year Period............ 11-2 Figure 11-2: Water Quality Improvement Projects and Programs .............................. 11-2 Figure 11-3: North Basin Groundwater VOC Plume................................................... 11-3 Figure 11-4: South Basin Groundwater Contaminant Plume..................................... 11-4 Figure 11-5: Production Wells to be Treated to Remove PFAS ................................ 11-7 Figure 12-1: Talbert Gap – Seawater Intrusion Barrier.............................................. 12-2 Figure 12-2: Key Well OCWD-M26 Groundwater Levels, .......................................... 12-1 Figure 12-3: Talbert Gap 250 mg/L Chloride Concentration Contours ....................... 12-2 Figure 12-4: Alamitos Gap – Seawater Intrusion Barrier ............................................ 12-3 Figure 12-5: Alamitos Gap I Zone Chloride Concentration Contours, 2021 ............... 12-4 Figure 12-6: Schematic Geologic Cross-Section from Huntington Harbor ................. 12-5 Figure 12-7: Sunset Gap Chloride Concentrations, 2020........................................... 12-7 Figure 12-8: Alamitos-Sunset Gap Groundwater Model Boundaries.......................... 12-8 Figure 12-9: Potential Sunset Gap Barrier Project Facilities .................................... 12-10 Figure 12-10: Newport Mesa Chloride Contours, 2020 ............................................ 12-12 Figure 13-1: Total Vertical Ground Surface Displacement from June 2015 to July 2020 ................................................................................................................................... 13-3
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Table 3-1: TDS Water Quality Objectives for Lower Santa Ana River Basin Management Zones ......................................................................................... 3-21 Table 3-2: Nitrate (as N) Water Quality Objective for ................................................. 3-23 Table 4-1 Water Budget, WY2016-17 to 2020-21 ........................................................ 4-1 Table 6-1: Sources of Recharge Water Supplies ......................................................... 6-1 Table 7-1: Major Groundwater Producers .................................................................... 7-1 Table 10-1: Management Actions based on Change in Groundwater Storage ..........10-5 Table 10-2: Approaches to Refilling the Basin ........................................................... 10-1 Table 11-1: Baseline Projected Future Salt Inflows.................................................... 11-1 Table 11-2: Baseline Future Nitrate (as N) Inflows..................................................... 11-1 Table 11-3: Summary of BEA Exemption Projects ..................................................... 11-8
BASIN 8-1 ALTERNATIVE 2022 UPDATE
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Appendix F - 66
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