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• 3.0 SITE DESCRIPTION <br /> 3.1 PHYSICAL SETTING <br /> fThe site is located at the Port of Stockton on West Washington Street, one mile west of <br /> Interstate 5 in Stockton, California. The site is situated in Township 1 North and Range 6 East and <br /> topographic map coverage is provided by the Stockton West Quadrangle, 7.5-Minute Series. The San <br /> Joaquin River is approximately 1/4-mile to the west. The site is flat at an elevation of 5 feet above mean <br /> Isea level. The site location and topographic coverage of the vicinity are shown on Plate 3. <br /> 3.2 GEOLOGIC AND HYDROGEOLOGIC SETTING <br /> The site is located at the Port of Stockton near the intersection of the Stockton Deep Water <br /> Channel and the San Joaquin River. The area lies within the flood plain of the San Joaquin River. <br /> ICalifornia Division of Mines and Geology geologic maps indicate that typical sediments include relatively <br /> permeable Quaternary aged stream channel, alluvial fan, and river basin deposits. Groundwater flow in <br /> the area is strongly influenced by tidal action and can vary significantly. No site specific hydrogeologic <br /> assessment was undertaken as part of this environmental assessment. <br /> Several geotechnical investigations have been carried out on the subject property and <br /> immediate surrounding areas. These investigations included the drilling of soil borings. Two borings <br /> 'A reaching depths of 80 and 90 feet were drilled on each side of the rotary railcar dumper on site. These <br /> borings indicate that the surface soils on site consist of loose sandy material extending to approximately <br /> five feet below ground surface (bgs). The surface material is underlain by approximately 30 feet of <br /> medium stiff to stiff silty clay/clayey silt. Underlying the silty clay/clayey silt are alternating layers of <br /> silty sand and clayey silt extending to 90 feet bgs. One of these borings was used for the installation of <br /> a piezometer; groundwater was measured at 6 feet bgs (Dames & Moore, June 1982). <br /> Based on the California Department of Water Resources Division of Planning, the average <br /> annual precipitation for Stockton is about 14.5 inches. The majority of the rain falls between the months <br /> of December and March. Some infiltration of these waters likely occurs in unpaved areas. <br /> f <br /> h • PSA04.007 4 <br /> 1 <br />