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WOODARD
<br /> &CURRAN
<br /> 4. DRY YEAR ANALYSIS
<br /> When comparing water demand and water supplies to determine availability of a long-term reliable water supply for
<br /> the proposed development, the assessment must consider available supply under normal, single-dry year, and
<br /> multiple-dry year conditions. The purpose of this assessment is to evaluate the likelihood of potential supply shortfalls
<br /> under various hydrologic conditions. If potential shortfalls are likely to occur,this assessment can also provide a basis
<br /> for planning for those conditions.
<br /> The City's projected water supply reliability in normal, single-dry year, and multiple-dry years is described in the
<br /> following sections.
<br /> 4.1 Normal Years
<br /> The City's projected potable water supply in normal years are presented in Table 20. In normal years,the City expects
<br /> to receive between 98 and 100 percent of its SCWSP supplies and 100 percent of its normal groundwater supply,
<br /> consistent with 2019 WSMP analyses.The normal year supply reliability is based upon SSJID's water supplies in 2010,
<br /> consistent with the SSJID 2015 UWMP.
<br /> Table 20: Projected Potable Water Supply in Normal Years
<br /> Water Source Water Right Reliability Allocation Contractual Entitlement AFY
<br /> or Contract 2020 2025 2030 2035 2040
<br /> Current Supplies
<br /> SCWSP Phase I SSJID Pre-1914 98-100%2 6,760 6,811 6,863 6,887 6,887
<br /> Contract'
<br /> Groundwater N/A3 -- 100% 4,720 4,720 4,720 4,720 4,720
<br /> Anticipated Future Supplies
<br /> SCWSP Phase II SSJID Pre-1914 98-100%z -- -- -- -- 3,784
<br /> Contract4
<br /> Groundwater N/A5 -- 100% 0 0 0 0 0
<br /> Total SCWSP Supplies 6,760 6,811 6,863 6,887 10,671
<br /> Total Groundwater 1 4,720 4,720 4,720 4,720 4,720
<br /> Normal Year Total I t 11,480 11,531 11,583 11,607 15,391
<br /> Source:City of Lathrop 2019 WSMP,Table 5-8(EKI,2019)
<br /> Notes:
<br /> 1. The City's total Phase I allotment of SCWSP water,following the 2013 sale to the City of Tracy,is 6,887 AFY.
<br /> 2. During a normal water year,the City expects to receive between 98%and 100%of its SCWSP water supply allocation.The City's projected
<br /> SCWSP allocations are presented in Table 11.
<br /> 3. Reflects the City's estimated groundwater yield for Wells 6,7,8,and 10.
<br /> 4. The City's total Phase II allotment of SCWSP water,following the 2013 sale to the City of Tracy,is 10,671 AFY.Potential additional
<br /> groundwater supplies may be obtained through the Well 21 WTF upgrade,which could be completed in two phases.Phase 1 is anticipated to
<br /> be completed by 2020 and Phase 2 is anticipated to be completed by 2025.Potential additional groundwater may also include bringing Well 9
<br /> back online. However,for this report,water from Well 21 and Well 9 are not included as Anticipated Future Supplies.
<br /> Califia(0011533.00) 37 Woodard&Curran, Inc.
<br /> River Islands Phase 2 Development Water Supply Assessment September 2020
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