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= MAI_ <br /> .4pp/ied 0990silstoms 4191-E Power Inn Road,Sacramenln, CA 95826 (916)452-2901 <br /> e FREMONT a COSTA h1ESA + SACRAMENTO a HOUSTON <br /> PRELIMINARY REPORT <br /> SOIL CONTAMINATION INVESTIGATION <br /> AND <br /> REMOVAL OF UNDERGROUND STORAGE TANKS <br /> at <br /> UNOCAL Service Station No. 6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> for <br /> UNOCAL Corporation <br /> INTRODUCTION <br /> Applied. GeoSystems was retained by UNOCAL Corporation to perform <br /> a sail contamination investigation at the above-referenced site. <br /> The purpose of this investigation was to evaluate contamination <br /> detected during installation of a gasoline-blending system at the <br /> site in May 1988. This report describes the tasks performed to <br /> date, summarizes and discusses the data collected to evaluate the <br /> degree of hydrocarbon contamination in the soil, and presents <br /> recommendations to address the contamination remaining at the <br /> site. <br />