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WOODARD &CURRAN 2. WATER SUPPLY This section discusses the existing and projected water supplies available to the City. The subsections describe the various types of supplies, including the assumptions and methodology used for estimations. Also discussed are the factors that could affect future water supply reliability. 2.1 Existing Water Supplies California Water Code: 10910(d) (1) The assessment required by this section shall include an identification of any existing water supply entitlements, water rights, or water service contracts relevant to the identified water supply for the proposed project, and a description of the quantities of water received in prior years by the public water system, or the city or county if either is required to comply with this part pursuant to subdivision(b), under the existing water supply entitlements, water rights, or water service contracts. (2)An identification of existing water supply entitlements, water rights, or water service contracts held by the public water system, or the city or county if either is required to comply with this part pursuant to subdivision (b), shall be demonstrated by providing information related to all of the following: (A) Written contracts or other proof of entitlement to an identified water supply. (B) Copies of a capital outlay program for financing the delivery of a water supply that has been adopted by the public water system. (C) Federal, state, and local permits for construction of necessary infrastructure associated with delivering the water supply. (D)Any necessary regulatory approvals that are required in order to be able to convey or deliver the water supply. The Project's water needs are served by the City, which obtains water from both imported surface water and local groundwater sources. The City receives treated Stanislaus River water through the SCWSP that is operated by the SSJID and discussed in Section 2.1.1. The City also owns and operates six groundwater production wells, although Wells#9 and#21 are currently inactive as discussed in Section 2.1.2. Due to the relatively high cost of SCWSP water, the City has historically relied upon its groundwater wells as the primary source of supply.The City's surface water and groundwater production for 2014-2018 is summarized in Table 3; 2019 water supply, inclusive of recycled water, is summarized in Table 4. The City generates recycled wastewater as a non-potable supply for agricultural irrigation currently,and for urban irrigation ultimately.The City also has long-standing water conservation programs that provide supply through reducing current demands and assuring that future water use is efficient. The following subsections describe the current water supply sources for the City. Information presented in this section has been excerpted from the City's 2015 UWMP,2019 WSMP, and 2019 Recycled WSMP. Table 3: Summary of City of Lathrop Potable Water Supply in Prior Years (2014-2018) Potable Supply Source Actual Volume AFY l 2014 2015 2016 2017 2018 Purchased or Imported Supplies 445 241 252 921 1,947 Groundwater 3,563 3,204 3,394 3,247 2,605 Total Potable Supplies 4,008 3,445 3,646 4,168 4,552 Note: 1. Source:City of Lathrop 2015 UWMP(EKI,2017). Califia(0011533.00) 10 Woodard&Curran, Inc. River Islands Phase 2 Development Water Supply Assessment September 2020