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Section 3 <br /> REGIONAL GEOLOGIC AND HYDROGEOLOGIC SETTING <br /> The Lathrop Gas Dehydrator Station is located within the northwestern part of the San Joaquin Valley <br /> between the San Joaquin River and the Coast Range Geomorphic Province. The San Joaquin Valley is a <br /> topographic and structural basin bounded on the east by the Sierra Nevada Range and the west by the <br /> Coast Ranges. The dehydrator station is situated on a veneer of recent fluvial deposits that consist mainly <br /> of clay and silty fine-grained sand to a depth of at least 13 to 14 feet(Groundwater Technology Inc., 1988). <br /> This facility is also located in the San Joaquin Groundwater Basin. Locally, recharge to the basin occurs to <br /> the west of the site in the foothills of the Diablo Mountain Range, and from surface infiltration. Discharge <br /> from the basin occurs through drainage into the San Joaquin River and its tributaries (e.g., Old River to <br /> the south and Middle River to the west of the site). The depth to first groundwater at the site is <br /> approximately 10 to 12 feet below grade(Groundwater Technology Inc., 1988). <br /> cca/08/19/93/9449arpt.doc/mkn4 3-1 <br />