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4 <br /> 1 .0 INTRODUCTION <br /> Exxon Company, U.S .A. retained Alton Geoscience in <br /> February 1991 to conduct a preliminary soil assessment at <br /> Exxon Service Station No. 7--3708 , 2705 Country Club <br /> Boulevard, Stockton, California. The site plan is shown as <br /> Figure 1 . <br /> 1 . 1 �jcope <br /> This preliminary soil assessment was performed to obtain an <br /> estimate of the extent of petroleum hydrocarbons in the soil, <br /> if any, prior to tank replacement activities . <br /> Alton Geoscience supervised and/or performed the following <br /> tasks during this preliminary soil assessment: <br /> • Drilled, logged, and backfilled 10 exploratory soil <br /> borings . <br /> • Collected and chemically analyzed soil samples for <br /> specified hydrocarbon constituents . <br /> • Analyzed data and prepared this report presenting the <br /> results, findings, and conclusions of the preliminary <br /> soil assessment . <br /> • The above tasks and related field and sampling activities <br /> were performed in accordance with the requirements of the <br /> California Regional Water Quality Control Board, Central <br /> Valley Region (RWQCB) and the San Joaquin County Public <br /> Health Services Department. <br /> 1 . 2 Site Vocation and Description <br /> Exxon Service Station No. 7--3708 is located on the northeast <br /> corner of the intersection of Country Club Boulevard and Ryde <br /> Avenue in Stockton, California. The site is presently an <br /> operating service station with three underground fuel storage <br /> tanks and one underground waste oil tank. The site plan <br /> shows the present tank locations . <br /> 2 .0 FIELD AND ANALYTICAL METHODS <br /> The procedures and methods used during field activities are <br /> discussed below, and a description of the drilling and <br /> sampling procedures is presented in Appendix A. <br /> i <br />