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underlain by unconsolidated alluvial deposits, which may be up to several thousand feet <br /> thick These sediments make up the San Joaquin Basin aquifer system, which is pumped <br /> extensively for irrigation, domestic, municipal, and industrial use Due to its proximity to <br /> the Sacramento-San Joaquin Delta, the depth to ground water in the Stockton area is <br /> generally less than 30 feet (DWR, September 1975) <br /> Ground water in the Stockton area generally flows to the northwest, toward the many <br /> waterways, creeks, and rivers that drain into the San Francisco Bay Locally, however, the <br /> direction of ground water flow may be influenced by recharge from the many canals, drains, <br /> and sloughs in the area and/or pumping for municipal use In particular, the extraction of <br /> ground water for beneficial use has created a large and irregular cone of depression in the <br /> piezometric surface to the northwest of downtown Stockton The geometry of this cone of <br /> depression vanes seasonally and from year to year The prevailing or regional direction of <br /> ground water flow in the vicinity of the subject site appears to be northeast (San Joaquin <br /> County Flood Control and Water Conservation District, September 1992), toward the <br /> pumping depression described above <br /> 2-3 <br /> G30SYSTE <br /> Consultants, Inc <br />