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Section 4 <br /> REGIONAL GEOLOGIC AND HYDROGEOLOGIC SETTING <br /> The Lathrop Dehydrator Station is located within the northwestern part of the San Joaquin Valley between <br /> the San Joaquin River and the Coast Range Geomorphic Province. The San Joaquin Valley is a topographic <br /> and structural basin bounded on the east by the Sierra Nevada fault block and the west by the Coast <br /> Ranges. The dehydrator station is situated on a veneer of Recent fluvial deposits that consist mainly of clay, <br /> silt, sand, and gravel that extends to a depth of at least 100 feet (CDMG, 1966). This sequence overlies the <br /> Corcoran Clay Member, a major aquitard in the San Joaquin basin (Hotchkiss and Balding, 1971). <br /> The Lathrop Dehydrator Station is located in the San Joaquin Ground Water Basin. Locally, recharge to the <br /> basin occurs to the west of the site in foothills of the Diablo Mountain Range, and from surface infiltration. <br /> Discharge from the basin occurs through drainage into the San Joaquin River and its tributaries (the Old <br /> River to the south and the Middle River to the west of the site), and by pumping of ground water for <br /> domestic and industrial uses. Based on the May 19, 1988 Groundwater Technology, Inc. soil study, the <br /> depth to first ground water beneath the site is approximately 12 feet below grade. <br /> 462891/42/PPU26 4-1 <br />