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f, <br /> { <br /> 3.0 ENVIRONMENTAL SETTING <br /> i <br /> 3.1 Site Topography <br /> The site is located at the street addresses of 1282 Shaw Road,immediately outside the city limits <br /> of Stockton(Figure 3). The ground surface elevation at the site is approximately 27 feet above <br /> mean sea level as determined by the U.S. Geological Survey, Stockton West and Stockton East <br /> 7.5 minute topographic maps, scale 1: 24,000, dated 1981 (Figure 3). The topography across the <br /> k <br /> site is relatively flat with a regional slope to the southwest. F <br /> 3.2 Regional Geology and Soils i <br /> I, <br /> The site is located in a relatively flat area of the southern portion of the Sacramento Valley <br /> Valley(Figures 1 and 2). The site is Iocated in the east-central portion of the Great Valley <br /> geomorphic province, a north-south-trending valley approximately 400 miles long by 50 miles <br /> i <br /> wide. The surface of the southern Sacramento Valley is composed primarily of unconsolidated, <br /> Pleistocene(1.6 million to 11,000 years ago) and Recent(11,000 years ago to the present) <br /> alluvial sediments(Wagner and others, 1991;Jennings, 1977). <br /> The ST&E site is located on an old Calaveras River and tributary floodplain that extends <br /> westward from the Sierran foothills into central San Joaquin County. This flood plain has been <br /> exposed and leveled by progressive down-cutting of the ancestral Calaveras River and its <br /> tributaries and by wind erosion (Wagner and others, 1991). <br /> Quaternary-age sediments extend from the ground surface to about 400 feet bgs at the site. The <br /> upper 60 feet of the site is comprised of eolian and flood plain sediments of the Modesto <br /> Formation(Wagner, 1991). The Modesto and underlying.Riverbank Formations consist of silts, <br /> sands, and gravels that generally become coarser with depth. <br /> MainlDTnvironmenfal1\STENWorkplan%WorkplanI 1192007.wpd 12 <br /> I <br />