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1 <br /> 1 <br /> Section 3 <br /> 1 REGIONAL GEOLOGIC AND HYDROGEOLOGIC SETTING <br /> 1 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 /> 1 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 /> 1 of clay and silty fine-grained sand to a depth of at least 13 to 14 feet(Groundwater Technology Inc. 1988). <br /> The 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 /> 1 from the basin occurs through drainage into the San Joaquin River and its tributaries (e.g., Old River to the <br /> south and Middle River to the west of the site). The depth to first groundwater at the site is approximately <br /> 9 feet bgs (PG&E 1993). <br /> I <br /> l <br /> l <br /> l <br /> l <br /> l <br /> l <br /> l <br /> l <br /> cca/03/10/95 08:19 AM(0688brpt.doc/ntw12) 3-1 <br />