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1.0 INTRODUCTION <br /> EXXON, Inc. has subleased Regal Service Station 503 from Wickland <br /> Oil Company (WOC) . WOC has upgraded the station with a double <br /> contained product storage and dispensing system. During the <br /> removal of the old underground storage tanks and subsequent <br /> assessment, gasoline range hydrocarbon contamination was found to <br /> exsist in both the native soil and ground water beneath the site. <br /> 1.1 LOCATION <br /> The station is located at 6.925 Pacific Avenue at the intersection <br /> of Douglas Road, in San Joaquin County, Stockton, California. The <br /> site lies in Section 21; T?N; R6E; MDB&M at approximately 12 'feet <br /> above mean sea level (HSL) (see FIGURES 1, 2,. 3, and 3A) . The <br /> parcel is # 31 and can be locates %n the Assessor's Book 97 on <br /> page 41. <br /> 1.2 PREVIOUS WORD <br /> EXXON, Inc. contracted Hardy Lawson to perform a site evaluation <br /> prior to subleasing the station. Hardy Lawson conducted a site <br /> visit, however, due to the time frame availability they adore <br /> unable to obtain the necessary permits required to perform <br /> i <br /> exploratory borings. <br /> Town and Country Construction Co. (T&C) removed three underground. <br /> storage tanks on October 21, 1988. Each tank (regular 'leaded, <br /> regular unleaded, and premium unleaded) was visually inspected by <br /> T&C for any possible failure (holes, cracks, etc. ) . The tanks <br /> were found to be tight, with no visible evidence of failure. <br /> Applied GeoSystems (AGS) of Sacramento, California performed the <br /> necessary soil sampling. Sample results of the native soil <br /> samples obtained from beneath each tank indicated that the soil <br /> j <br /> container) gasoline range hydrocarbons. <br /> T&C deepened the excavation to approximately 22 feet below the <br /> surface on October 25, 1988 in order to remove contaminated soil. <br /> Soil sampling was performed by A'jS. <br /> During the removal of each tank and subsequent ©xcavatior. <br /> approximately 550 yards of soil was removed and stored on sitcr. r <br /> Soil aeration commenced, in an attempt to lower contamination <br /> levels to below 100 parts per million (ppm) for Total Petroleum <br /> Hydrocarbons (TPH) . AGS performed routine sampling (1 sample per <br /> 50 yards of soil) of the aerated soil in order to classify the <br /> soil for proper disposal. All aerated soil classified below 100 <br /> ppm TPH was removed to the Sacramento County Landfill. <br />