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f <br /> M NOM <br /> j <br /> Regional Hydrogeology <br /> The site lies at an elevation of approximately 47 feet above mean sea level and is <br /> located in San Joaquin County,in the northern portion of the San Joaquin Valley. The <br /> San Joaquin Valley is a broad, alluvium-filled structural basin bounded to the east by <br /> the Sierra Nevada Mountain Range and to the west by the Coast Range. The total <br /> thickness of alluvial fill in the valley is thousands of feet. The alluvial sediments 3 <br /> generally consist of poorly sorted silt and fine sand with less extensive lenses of medium <br /> to coarse-grained sand and gravel. Quaternary Iacustrine deposits also occur in the <br /> central and western portions of tf+p valley,and consist of clay,silt, and sand. <br /> 5 <br /> In the vicinity of the site, surflcial deposits are characterized as low alluvial plain and <br /> fan deposits. . These deposits generally are less than 10 feet thick and consist of silts, <br /> fine sands, and less extensive coarse sand and gravel lenses. Underlying deposits are <br /> referred to as older alluvium and reach a thickness of up to 400 feet. These deposits <br /> 1 <br /> consist of interbedded clay, silt,sand, and gravel Groundwater flow direction beneath' s <br /> x the`;site is' anticipated to:be 'hortherly, based ori,regional draiaagG,patterns:'anc <br /> too a . <br /> P gr4h Y... <br /> r <br /> a 1 <br /> � r <br /> 1 <br /> t <br /> i <br /> j <br /> -M-M <br /> 3100101/REPORT 2j <br /> February 13,1991 <br /> t <br />