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I . INTRODUCTION <br /> EA Engineering, Science, and Technology, Inc. (EA) was retained <br /> by Exxon Company, U.S.A. to investigate the extent and source of <br /> r <br /> ground-water hydrocarbons in the vicinity of former Exxon Retail <br /> Site (RS ) 7-3942, located at 4444 N. Pershing Avenue, Stockton, <br /> California ( Figure 1 ) . On the basis of previous investigations <br /> ` conducted by American Environmental Management Corp. (AEM 1986 ) , <br /> Harding Lawson Associates (HLA 1987 ) , and EA ( 1987 ) , sources <br /> beyond this site were suspected of contributing to hydrocarbon <br /> contamination identified in the ground water at this site. This <br /> IVA report summarizes the results of the most recent investigation, <br /> in which three off-site monitoring wells were installed to define <br /> the extent of the hydrocarbons and their possible source( s ) . <br /> r <br /> e20/73942 1 <br />