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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 risk assessment for <br /> evaluating the significance of hydrocarbon contamination at <br /> former Chevron Service Station 9-7780 in Stockton, California. <br /> This r1sk assessment included: <br /> 1 . reviewing existing site data and appropriate, available <br /> literature <br /> 2. completing an inventory of existing wells within 0 .5 <br /> mile of the site <br /> 3. sampling five domestic water supply wells within 0 .25 <br /> mile of the site and analyzing samples for benzene, <br /> toluene, xylene, total <br /> y , and petroleum hydrocarbons <br /> 4. developing a hydrogeological model for evaluating <br /> groundwater transport of contaminants <br /> 5. evaluating the hazards to the receptors within the area <br /> [ and to the nearest ground water user to the site. <br /> I <br /> This report presents the results of the risk assessment conducted - <br /> for the site. It complies with the Problem Assessment Report <br /> (PAR) as outlined by the Central Valley Regional Water Quality <br /> Control Board (Boggs 1987) . Table 1 cross-references the <br /> requirements for the PAR ana the sections of this report. This <br /> report also provides the information requested by the San Joaquin <br /> Local Health District for the Stockton site (Valinoti 1987) . <br /> 1 <br />