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YP R msMUM <br /> i � i 1 <br /> 1.0 INTRODUCTION <br /> EXXON, Inc. subleased Regal Service Station 603 from Wickland <br /> Oil Company (WOC) who recently 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, gazoline range hydrocarbon contamination was found to <br /> exsist In both the native so;i.l (vadose zone) and ground water <br /> beneath the site. <br /> 1.1 LOCATION <br /> The site is located at 6425 Pacific Avenue at the intersection <br /> of Douglas Road, in San Joaquin County, Stockton, California. The <br /> 7.m.. property lies in Section 21; T2N; R6h; MDB&H at approximately 12 <br /> feet above mean sea level (MSL), see Figures 1, 2, 3, and 3A. The <br /> parcel is # 31 and located on page 41 in the Assessor's Book 97. <br /> 1.2 PREVIOUS WORK <br /> Prior to subleasing the sl.arcion, EXXON, Inc. contracted Hardy <br /> Lawson to perform a site evaluation. Hardy Lawson conducted 1 <br /> a site visit-, however, they were unable to obtain the necessary <br /> + permits required to perform exploratory borings because of a <br /> conflict with time frame availability. <br /> Town and Country Construction Co. (TQC) removed three underground <br /> storage tanks from the site on October 21, 1988. TQC <br /> visually inspected each tank (regular leaded, regular unleaded, <br /> and premium unleaded), but found no apparent evidence of failure <br /> (holes, cracks, etc.). The tanks were found to be tight. Applied <br /> Geo Systems (AGS), '.of Sacramento, California, performed the <br /> necessary soil sampling. Results of the native sail samples <br /> obtained from beneath each tank indicated that the soil contained <br /> gasoline range hydrocarbons. <br /> To remove the contaminated soil, T&C deepened the excavation to ! <br /> approximately 22 feet below the surface on October 25, 1988. <br /> AGS then performed a soil sampling. <br /> i <br /> During the removal of each tank and subsequent excavation, <br /> approximately 650 yards of soil was removed and stored on site. <br /> Soil aeration commenced, in an attempt to low_r contamination <br /> levels to below 100 parts per million (ppm) for `total Petroleum <br /> v Hydrocarbons (TPH). AGS performed routine sampling (1 sample per <br /> 50 yards of soil) of the aerated soil in onier to classify it <br /> for proper disposal. All aerated soil classified below 100 <br /> ppm TPH was then transported. to the Sacramento County Landfill. <br /> 1 <br /> V <br />