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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 ( S_VCA) on 30 June 1988 at a Chevron property SS 9-0265 <br /> in Stockton, California. This report describes the investigation <br /> and presents the results. <br /> 1 . 2 SITE SETTING <br /> Chevron property SS 9-0265 is located on the southeast corner of <br /> the intersection of Lathrop Road and Harlan Road, adjacent to <br /> Interstate Highway 5 in the town of Lathrop, California (Figure <br /> 1 ) . Lathrop, a small town with a population of 5, 500, is <br /> situated 11 miles south of Stockton and 2 miles north of Manteca. <br /> No evidence of service facilities, buildings, pavement, or gravel <br /> was observed on the site ( see photographs in Appendix A) . During <br /> the site visit, no evidence of contamination (e.g. , soil <br /> staining, discolored surface water, unvegetated soils, odors ) was <br /> found. <br /> The site is an undeveloped field located in a rural area adjacent <br /> to Interstate Highway 5 (Figure 2 ) . The nearest residences, an <br /> older and more spacious tract to the northeast and a newer and <br /> more compact tract to the southeast, are approximately 500 feet <br /> from the site. There are no schools or hospitals in the immedi- <br /> ate vicinity. The site ' s elevation is 15 feet above mean sea <br /> level. The topographic gradient is nearly flat, about 10 feet <br /> per mile ( 0 . 002 ) , down to the west. No surface water is mapped <br /> within 0 . 5 mile of the site. The San Joaquin River is located <br /> 1 . 5 miles west at its closest point. <br /> c40/90265 1 <br />