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Groundwater Sustainability Plan Solano Subbasin Draft Section 2 SUB NO BA A S L I O N S Groundwater Sustainability Plan Solano Subbasin Draft Section 2 Prepared for Solano Prepared by GSA Collaborative TEAM November 2020 DRAFT: NOVEMBER 20, 2020 SOLANO SUBBASIN PLAN AREA GROUNDWATER SUSTAINABILITY PLAN 1 SECTION 2 CONTENTS 2 2. Plan Area (§ 354.8) .................................................................................................................... 2-1 3 2.1. Summary of Jurisdictional Areas and Other Features (§ 354.8 a and b) ................................... 2-1 4 2.2. Water Resources Monitoring and Management Programs (10727.2G) (§ 354.8c, d, and e) .... 2-1 5 2.2.1. Monitoring Entities and Programs ..................................................................................... 2-5 6 2.2.2. Groundwater Level Monitoring ....................................................................................... 2-10 7 2.2.3. Groundwater and Surface Water Quality Monitoring ..................................................... 2-14 8 2.2.4. Surface Water Stage and Flow Monitoring ...................................................................... 2-22 9 2.2.5. Surface Water Diversion Monitoring ............................................................................... 2-24 10 2.2.6. Land Subsidence Monitoring ........................................................................................... 2-24 11 2.2.7. Habitat/Biological Monitoring ......................................................................................... 2-26 12 2.2.8. Management Programs ................................................................................................... 2-27 13 2.2.9. Surface Water Programs .................................................................................................. 2-32 14 2.3. Land Use Elements or Topic Categories of Applicable General Plans (§ 354.8a and f) ........... 2-34 15 2.3.1. Summary of General Plans and Other Land Use Plans .................................................... 2-37 16 2.3.2. Relationship Between Land Use Plans and GSP Implementation .................................... 2-39 17 2.3.3. Information regarding the implementation of land use plans outside the basin that could 18 affect the ability of the Agency to achieve sustainable groundwater management ...................... 2-40 19 2.3.4. Summary of the Well Permitting Process ........................................................................ 2-40 20 2.4. Additional GSP Elements (§ 354.8 e and g) .............................................................................. 2-45 21 2.4.1. Control of saline water intrusion ..................................................................................... 2-45 22 2.4.2. Wellhead protection ........................................................................................................ 2-45 23 2.4.3. Recharge Areas ................................................................................................................ 2-45 24 2.4.4. Migration of contaminated groundwater ........................................................................ 2-45 25 2.4.5. Well construction, abandonment, and well destruction program: ................................. 2-45 26 2.4.6. Replenishment of groundwater extractions .................................................................... 2-47 27 2.4.7. Conjunctive use and underground storage ...................................................................... 2-47 28 2.4.8. Addressing groundwater contamination cleanup, recharge, diversions to storage, 29 conservation, water recycling, conveyance, and extraction projects ............................................. 2-47 30 2.4.9. Efficient water management practices ............................................................................ 2-47 31 2.4.10. Relationships with state and federal regulatory agencies ............................................... 2-47 LSCE Team 2-i DRAFT: NOVEMBER 20, 2020 SOLANO SUBBASIN PLAN AREA GROUNDWATER SUSTAINABILITY PLAN 32 2.4.11. Review of land use plans and efforts to coordinate with land use planning agencies to 33 assess activities that potentially create risks to groundwater quality or quantity .......................... 2-48 34 2.4.12. Impacts on groundwater dependent ecosystems ........................................................... 2-48 35 2.5. Notice and Communication (§ 354.10, 10723.4) ..................................................................... 2-49 36 2.5.1. Notice (§ 354.10 a, b, and c) ............................................................................................ 2-49 37 2.5.2. Decision-Making Process ................................................................................................. 2-49 38 2.5.3. Public Engagement ........................................................................................................... 2-49 39 2.6. References ............................................................................................................................... 2-55 40 41 Tables 42 Table 2-1: Groundwater Level Monitoring Sites in Plan Area by Monitoring Entity 43 Table 2-2: Groundwater Quality Monitoring Sites in Plan Area by Monitoring Entity 44 Table 2-3: Surface Water Monitoring Sites in Plan Area by Monitoring Entity 45 46 Figures 47 Figure 2-1: Solano Subbasin GSP Area and Groundwater Sustainability Agencies 48 Figure 2-2: Jurisdictional Boundaries – Cities, Counties and Entities with Water Management 49 Responsibilities 50 Figure 2-3: Jurisdictional Boundaries – Federal, State and Tribal Lands 51 Figure 2-4: Groundwater Level Monitoring (2015-Present) 52 Figure 2-5: Groundwater Level Monitoring (Pre-2015) 53 Figure 2-6: Groundwater Quality Monitoring (2015-Present) 54 Figure 2-7: Groundwater Quality Monitoring (Pre-2015) 55 Figure 2-8: Surface Water Locations 56 Figure 2-9: Points of Diversion 57 Figure 2-10: Land Use – 2016 (USDA) 58 Figure 2-11: Land Use – 2016 (DWR) 59 Figure 2-12: Map of Well Information by Section: Number of Domestic Wells (from WCR data) 60 Figure 2-13: Map of Well Information by Section: Number of Agricultural Wells (from WCR data) 61 Figure 2-14: Map of Well Information by Section: Number of Industrial Wells (from WCR data) 62 Figure 2-15: Map of Well Information by Section: Number of Public Supply Wells (from WCR data) 63 Figure 2-16: Well Permit Consultation Zone 64 65 Appendix 66 Appendix 2a: Public Outreach and Communications and Engagement Activities LSCE Team 2-ii DRAFT: NOVEMBER 20, 2020 SOLANO SUBBASIN PLAN AREA GROUNDWATER SUSTAINABILITY PLAN 67 2. PLAN AREA (§ 354.8) 68 2.1. Summary of Jurisdictional Areas and Other Features (§ 354.8 a and b) 69 The Solano Subbasin Groundwater Sustainability Agency GSA (GSA) Collaborative (Solano Collaborative) 70 encompasses parts of Solano and Sacramento and small parts of Yolo County. The majority of the Plan 71 Area is comprised of the Solano Subbasin GSA, with the City of Vacaville GSA, Solano Irrigation District 72 GSA, and Sacramento County GSA. The Northern Delta GSA and GSAs for Reclamation Districts (RD) 3, 73 137, 407, 554, 556, 2067, and 2111 comprise the remaining areas within the Plan Area boundaries. The 74 Plan Area is adjacent to the Yolo Subbasin to the north and the east, the South American Subbasin to the 75 east, the Eastern San Joaquin to the southeast, East Contra Costa Subbasin to the south, and the Suisun- 76 Fairfield Groundwater Basin to the west as shown on Figure 2-1. 77 More urbanized areas within the Plan Area include Dixon, Vacaville, Rio Vista, Isleton, and Walnut 78 Grove. Active water purveyors in the Solano Subbasin include: the Solano Irrigation District, Solano 79 County Water Agency, Maine Prairie Water District, North Delta Water Agency, Rural North Vacaville 80 Water District, and RD 2068 in addition to those RDs previously mentioned above as shown on 81 Figure 2-2. Public entities that operate within the Plan Area include the U.S. Department of Defense and 82 the U.S. Fish and Wildlife Service, the California Public Lands Commission, and the California Parks and 83 Recreation Commission as shown on Figure 2-3. 84 2.2. Water Resources Monitoring and Management Programs (10727.2G) 85 (§ 354.8c, d, and e) 86 A variety of local, state, and federal agencies implement monitoring and management programs in the 87 Solano Subbasin, each governed by its own specific set of statutory or regulatory requirements. This 88 Groundwater Sustainability Plan (GSP, or Plan) Section provides brief a description of the local, state, 89 and federal agencies that implement monitoring and management programs in the Solano Subbasin. 90 The objectives of those monitoring programs are often dictated by statutory or regulatory requirements 91 intended to protect groundwater and surface water quality. This section describes those programs and 92 their monitoring networks. 93 The objectives of this Plan section are summarized as follows: 94 Describe the local, state, and federal agencies with existing water and land use monitoring 95 and management programs in the Solano Subbasin. These descriptions provide context and a 96 general understanding of efforts underway by other agencies, which may influence groundwater 97 conditions in the Subbasin. 98 Describe the extent of recent and historical monitoring networks in the Solano Subbasin. This 99 information precedes a discussion, in a subsequent section of this GSP, of the monitoring 100 network that the GSAs will use to track groundwater-related
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