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INTRODUCTION <br /> Harken Marketing Company (HMC) has prepared this work plan to described the <br /> task proposed to evaluate soil end ground water hydrocarbon contamination at HMC <br /> Location#100878, 1012 West Yosemtie Avenue,Manteca,San Joaquin County,California. <br /> BACKGROUND <br /> "he site is located in San Joaquin County, Section 5, Township 2 South, Range 7 <br /> East, California. The site Iocation is depicted on the Site Vicinity Map (Plate P-1). The <br /> site contained three 10,000 gallon steel underground storage tanks installed in 1970. On <br /> July 13, 1989 the tank containing regular leaded gasoline failed a tank test. The station <br /> closed in August, therefore, no further tank testing was performed. The tanks and lines <br /> were removed in December 1989. <br /> LOCAL HYDROGEOLOGY <br /> The site area is underlain by alluvial fan deposits of the Great Valley and are of <br /> Recent age. These sediments consist of unconsolidated clay, silt, and sand. The <br /> topographic surface is nearly flat with a slight westward slope. The San Joaquin River is <br /> located approximately 4 miles southwest of the site. Based on regional maps prepared from <br /> 1988 ground water data by San Joaquin Coun; Flood Control and Water Conservation <br /> District,we expect the depth to ground water in the vicinity of the site to be approximately <br /> 2 <br />