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5.15 WATER RESOURCES TABLE 5.15-3 Average Rainfall near the Proposed Project Site(Lodi,California)(1948-2007) Precipitation Annual Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Average 17.62 0.9 2.25 3.11 3.42 2.9 2.6 1.42 0.5 0.13 0.04 0.05 0.29 Source: WRCC, 2008. 5.15.1.2 Groundwater The LEC project site is within the San Joaquin Valley Groundwater Basin within the Eastern San Joaquin Subbasin (DWR,2006) (Figure 5.15-2). The Eastern San Joaquin Subbasin is defined by the areal extent of unconsolidated to semiconsolidated sedimentary deposits that are bounded by the Mokelumne River on the north and northwest,San Joaquin River on the west,Stanislaus River on the south, and consolidated bedrock on the east. The Eastern San Joaquin Subbasin is drained by the San Joaquin River and several major tributaries, including the Stanislaus,Mokelumne, and Calaveras. Unless otherwise designated by the Central Valley RWQCB or excluded based on the minimum beneficial use exception criteria described in Table 5.15-4, all ground waters are considered suitable or potentially suitable, at a minimum,for municipal and domestic water supply, agricultural supply, industrial service supply, and industrial process supply (Central Valley RWQCB, 1998). TABLE 5.15-4 Minimum Beneficial Use Exception Criteria Minimum Beneficial Use Exception Criteria Municipal and Domestic Water Supply Total dissolved solids(TDS)exceeds 3,000 mg/L(5,000 mhos/cm, electrical conductivity)and is not reasonably expected to supply a public water system Municipal and Domestic Water Supply,Agricultural Contamination, either by natural processes or by human Supply, Industrial Service Supply, and Industrial activity(unrelated to a specific pollution incident)cannot Process Supply reasonably be treated for domestic use using either Best Management Practices or best economically achievable treatment practices Municipal and Domestic Water Supply,Agricultural Does not provide sufficient water to supply a single well Supply, Industrial Service Supply, and Industrial capable of producing an average, sustained yield of 200 Process Supply gallons per day Municipal and Domestic Water Supply,Agricultural The aquifer is regulated as a geothermal energy Supply producing source or has been exempted administratively pursuant to 40 CFR, Section 146.4 for the purpose of underground injection of fluids associated with the production of hydrocarbon or geothermal energy, provided that these fluids do not constitute a hazardous waste under 40 CFR Section 261.3 Source: Central Valley RWQCB, 1998 5.15-6 SAC/371322/082340005(LEC_5.15_WATER_RESOURCES.DOC)