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r <br /> ME 0 <br /> u <br /> //ed GeoSYste�nS 4191•E Power Inn Road, Sactamento,CA 95826 (916;452-2901 <br /> • FREMONT • COSTA MESA •SACRAMENTO • HOUSTON <br /> June 1, 1988 <br /> 0601JCOM <br /> AGS Job No, 038032-2 <br /> Mr- Joe E. Comstock <br /> UNOCAL Corporation <br /> 76 Broadway <br /> Sacramento, California 95818 <br /> Subject: Executive summary of Work Plan for evaluation of soil <br /> and ground-water contamination at UNOCAL Service <br /> Station No. 6981, 4707 Pacific Avenue, Stockton, <br /> California. <br /> Mr. Comstock: <br /> The attached Work Plan describes a program for future work to <br /> evaluate the vertical and horizontal extent of hydrocarbon <br /> contamination at the above-referenced site. <br /> During installation of a gasoline blending system by UNOCAL <br /> Corporation, Applied GeoSystems was contracted to collect native <br /> soil samples from locations specified by UNOCAL personnel. <br /> �. Results of the soil analyses indicate that the soil was <br /> contaminated with hydrocarbons. Based on .these findings, Applied <br /> GeoSystems conducted further excavation which revealed <br /> contamination present to an approximate depth of 20 feet. <br /> Contaminated soil was excavated to approximately 20 feet deep in <br /> areas not limited by site structures. <br /> Based on the presence of soil hydrocarbon contamination <br /> encountered, Applied GeoSystems recommended further work at the <br /> site. This work should include delineation of the vertical and <br /> horizontal extent of soil and possible ground-water <br /> contamination. We recommend performing a soil vapor survey of <br /> the site for preliminary delineation of the hydrocarbon plume. <br /> Results of the sail vapor survey will enable Applied GeoSystems <br /> to make informed recommendations regarding the placement of <br /> subsequent monitoring wells. The proposed monitoring wells will <br /> be used to approximate the lateral limits of soil and ground <br /> water-contamination <br /> - at-the-site - _r -- -- - -_ -—--{ <br />