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1. INTRODUCTION <br /> 1.1 SCOPE <br /> At the request of Chevron U.S.A. Inc. , EA Engineering, Science, <br /> and Technology, Inc. (EA) conducted a soil vapor contaminant <br /> assessment (SVCA) at Chevron Service Station (SS) 9-6465. This <br /> report details the soil vapor contaminant assessment (SVCA) <br /> conducted on 19 November 1987 and makes recommendations for <br /> further investigations based on those results. <br /> 1.2 SI-TF.-SETTING - ----- - - - - <br /> Chevron SS 9-6465 is located on the north-northeast corner of <br /> Pershing Avenue and Robinhood Drive in Stockton, California <br /> (Figure 1) . Land use in the vicinity (Figure 2) is commercial <br /> and residential. The closest residence is as an apartment <br /> building within 200 feet to the northeast of the site. <br /> 1.3 HYDROGEOLOGY AND WATER USE <br /> The general geology around the study site consists of a thick <br /> sequence of river channel and flood plain deposits. These <br /> sequences contain interbedded sand, gravel, silt, and clay <br /> layers. There are several water bearing zones underlying the <br /> site. The shallowest water occurs at a depth of approximately 24 <br /> feet as recorded in wells at the site, the deepest water bearing <br /> zone is more than 1,OOO. feet deep. <br /> The soils which underlie the Pershing Avenue site consist of <br />/F interfingered layers of brown silty clay ant, brown silty sand. <br /> The water bearing unit underlying the site is composed of coarse, <br /> well--sorted sand and gravel. <br /> Ground-water flow in the area is semi-restricted due to the clay <br /> ✓ deposits. Locally, shallow ground water is flowing in a NNE <br /> CHV18.81J 1 <br />