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W ODARD &CURRAN 4.2 Single-Dry Years The City's projected water supplies in single-dry years are presented in Table 21. In single-dry years,the City expects to receive between 74 and 75 percent of its SCWSP supplies and 100 percent of its normal groundwater supply consistent with 2019 WSMP analyses. The single-dry year supply reliability is based upon SSJID's water supplies in 1977, consistent with the SSJID 2015 UWMP. Table 21: Projected Potable Water Supply in Single-Dry Years Water Source Water Right Reliability Allocation Contractual Entitlement AFY or Contract 2020 2025 2030 2035 2040 Current Supplies SCWSP Phase I SSJID Pre-1914 74-75%2 5,070 5,108 5,147 5,187 5,187 Contract' Groundwater N/A3 -- 100% 4,720 4,720 4,720 4,720 4,720 Anticipated Future Supplies SCWSP Phase II SSJID Pre-1914 74-75°/x2 -- -- -- -- 2,850 Contract, Groundwater N/A5 -- 100% 0 0 0 0 0 Single-Dry Year Total 1 9,790 9,828 9,867 9,907 12,757 Source:City of Lathrop 2019 WSMP,Table 5-9(EKI,2019) Notes: 1. The City's total Phase I allotment of SCWSP water,following the 2013 sale to the City of Tracy,is 6,887 AFY. 2. During a single-dry water year,the City expects to receive between 74%and 75%of its SCWSP water supply allocation.The City's projected SCWSP allocations are presented in Table 11. 3. Reflects the City's estimated groundwater yield for Wells 6,7,8,and 10. 4. The City's total Phase II allotment of SCWSP water,following the 2013 sale to the City of Tracy,is 10,671 AFY. 5. Potential additional groundwater supplies may be obtained through the Well 21 WTF upgrade,which could be completed in two phases. Phase 1 is anticipated to be completed by 2020 and Phase 2 is anticipated to be completed by 2025.Potential additional groundwater may also include bringing Well 9 back online. However,for this report,water from Well 21 and Well 9 are not included as Anticipated Future Supplies. 4.3 Multiple-Dry Years The City's projected water supplies in multiple-dry years are presented in Table 22. In multiple-dry years, the City expects to receive between 83 and 85 percent of its SCWSP supplies and 100 percent of its normal groundwater supply, consistent with City of Lathrop 2019 WSMP analyses. The multiple-dry year supply reliability is based upon SSJID's water supplies over the period 1990 through 1992,consistent with the SSJID 2015 UWMP. Califia(0011533.00) 38 Woodard&Curran, Inc. River Islands Phase 2 Development Water Supply Assessment September 2020