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0- P& <br /> ORN01 <br /> TANK C:1_0StJIZF. REPORT <br /> - 620 West Charter Way, Stockton,California <br /> Delta Project No.40-88-5M <br /> Page 3 <br /> 2.21 Slte Ilistary <br /> The previous retail gasoline outlet was constructed in 1971. Three underground gasoline storage tanks <br /> and a waste oil storage lank were installed at the time of site construction, The original waste oil tank <br /> was removed in 1987 and replaced with a dual-walled waste oil tank. Vapor recovery llnes were instaHed <br /> in 1975,and new product distribution lines were installed in 1978. The site remained in operation through <br /> October 1989. During early November 1989, the site was demolished. The underground storage tanks <br /> and associated product lines were removed during the week of November 13, 1989. Three new, 12,000- <br /> gallon underground gasoline storage tanks were installed at the site during the week of November 27, <br /> 1989. <br /> W A single soil sample taken from beneath the steel waste oil tank when it was removed in June of 1987 <br /> was analyzed for TPH,BTEX,and polychlorinated biphenyl(PCB)by EPA Method 8080,and halogenated <br /> volatile organic compounds by EPA Method 8010. All of the lest results were negative. Soil borings <br /> advanced at the site'�y Delta in February 1989,indicated the presence of petroleum constituents in soils <br /> surrounding the former gasoline storage tank area. <br /> 2.3 U1111tles <br /> f ' <br /> The site lies within the city of Stockton and is serviced by city water and sewer lines. A 24-inch sanitary <br /> sewer line and a 16-inch asbestos/cement(AC)water line are present along the north side of Charter Way. <br /> A 6-inch cast iron water line exists 19 feet south of the centerline along Charter Way. Electrical and <br /> 11Y <br /> natural gas lines are present along the northern edge of the property,immediately south of the sidewalk. <br /> t <br /> 2.4 Re <br /> elonal GeoloM and llvrim eolney <br /> The site lies within the Great Valley geomorphic province. The geologic materials beneath the region <br /> consist primarily of stream and Delta plain deposits of the San Joaquin River and its tributaries (Norris <br /> and Webb, 1976), Surficial geology of the area consists of fluvial sands,silts,and clays (Jennings, et at., <br /> 1977), and is considered to be several hundred feet thick. The San Joaquin County Flood Control and <br /> Water Conservation District Map for Spring 1989 indicates that unconfined and semiconGned ground water <br /> in the vicinity of the site generally flows to the northeast. <br />