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WOODARD &CURRAN Table 4: Summary of Current(2019) City of Lathrop Water Supply Available Supply Supply Source Percentage of Annual Actual Volume(AFY)l Potable Supply Contract/Capacity AFY Potable Supplies Purchased or Imported Supplies 4,273 96% 6,887' Groundwater 179 4% 4,7202 Total Potable Supplies 4,452 100% 11,607 Non-Potable Supplies Recycled Water 944 N/A N/A Total Non-Potable Supplies 1 9443 1 N/A N/A Sources:City of Lathrop 2019 WSMP,Table 5-1 (EKI,2019)and City of Lathrop staff email communication(September 2020). Notes: 1. 6,887 AFY is the maximum volume that the City may purchase from SSJID under SCWSP Phase I under their current contract(SSJID, 2019).These supplies are available following the sale of 1,120 AFY to the City of Tracy. 2. Assumes wells are operated at 50%maximum capacity on an annual basis. 3. Reflects amount of water applied for irrigation purposes. 2.1.1 Existing Wholesale Water Supply—SSJID The City currently purchases imported surface water from SSJID through the SCWSP, which supplies treated Stanislaus River water under the provisions of the Water Supply Development Agreement between the City and SSJID, dated October 1, 1995 (SSJID, 1995). 2.1.1.1 SSJID Surface Water Entitlements SSJID and neighboring Oakdale Irrigation District(OID)were formed in 1909 following the acquisition of the old Tulloch Ditch Company water rights. SSJID and OID receive a major portion of their water supply from the Stanislaus River, pursuant to a number of pre-1914 water rights, beginning with 1853 diversion rights. Based on these pre-1914 water rights, SSJID and OID are entitled to a combined 1,816.6 cubic feet per second (cfs)of direct surface water diversions from the Stanislaus River annually. These pre-1914 water rights are held jointly between SSJID and OID and are adjudicated (Provost& Pritchard, 2016). SSJID's water deliveries are largely governed by a 1988 Agreement and Stipulation with the United States Bureau of Reclamation (USBR)and OID,which recognized and protected the OID and SSJID's senior water rights that would be affected by the New Melones Reservoir(Provost&Pritchard,2016).The agreement entitles SSJID and OID to 600,000 AFY of supply in years when inflow to New Melones Reservoir is equal to or exceeds 600,000 AF. SSJID's share of this allotment is 300,000 AFY. In years when inflow to New Melones Reservoir is less than 600,000 AF,the entitlement is reduced based on a predetermined formula. During periods of normal flow, SSJID's entitlement to New Melones water is 300,000 AFY. Califia(0011533.00) 11 Woodard&Curran, Inc. River Islands Phase 2 Development Water Supply Assessment September 2020