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3 i.T <br /> i- <br /> 1 <br /> AGS 87031--2 <br /> USA Station No. 110 <br /> v Stockton, California <br /> This report describes the work elements performed, and summarizes <br /> the results of chemical analyses of soil and ground water <br /> sa ples• We also present our interpretations of the data and <br /> recommendations for future work at the site. The JDcation of the <br /> site relative to known underground utilities and ground-water <br /> supply wells is depicted on the site vicinity Map, Plate P-2. <br /> BACKGROUND <br /> The U.S.A. station studied is located at 2132 East Mariposa Road, <br /> as shown on the site Vicinity Map. We understand, on the basis <br /> of information supplied by U.S.A. petroleum, that the tanks and <br /> product lines have passed precision pressure tests twice in the <br /> last two years. Three 12,000-gallon undergrc,_tnd tanks located at <br /> the sauth«2stern <br /> margin of the site are used to store gasoline <br /> product; one 3,000-gallon tank contain <br /> diesel fuel. The <br /> approximate location of these underground storage tanks are shown <br /> on the Generalized Site Plan, Plate P-3. <br /> PEG drilled four exploratory soil borings at the site. <br /> Monitoring :cell s-1 was installed in one of these borings, which <br /> extends to a depth of 55..5 feet. The static ground-water surface <br /> _......_was_ found.-at_an approximate depth of 46 5 feet. Soil boring S-A <br /> was terminated at a depth o£ 45 feet, and s-B and s-C were <br /> 2 <br /> LA0,0116?e GeoSysa`ems <br />