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i <br /> PROPOSED SCOPE OF WORK <br /> FOR <br /> SUPPLEMENTAL SITE INVESTIGATION <br /> Mobil Oil Corporation <br /> Forager Bulk Station <br /> 500 East Grantline Road <br /> Tracy, California <br /> INTRODUCTION <br /> This work plan presents the proposed scope of work to conduct <br /> a supplemental site investigation of subsurface contamination <br /> and ground water monitoring at former Mobil Oil Corporation <br /> bulk plant, located at 500 East Grantline Road Tracy, <br /> California. The proposed scope of work was based on the <br /> results of previous site investigations conducted by Alton <br /> Geoscience, Inc. in December 1990 to define the nature and <br /> extent of hydrocarbon constituents in the subsurface soil and <br /> ground water at the site. <br /> The primary intent of the proposed site investigation work is <br /> to: ( 1 ) obtain additional information required by the San <br /> Joaquin County Environmental Health Services (SJEHS) and to <br /> conduct the 5--step investigative process of the Regional <br /> Water Quality Control Board, Central Valley Region (RWQCB) ,`_ <br /> (2 ) define the nature and extent of subsurface contamination <br /> downgradient of the site, and ( 3 ) develop an appropriate <br /> course of action for regulatory case closure or remediation. " <br /> PROJECT BACKGROUND <br /> The former Mobil Oil bulk plant is presently a fenced, vacant <br /> lot, located on the south side of East Grantline Road at an <br /> elevation of approximately 33 feet above mean sea level <br /> (NGVD-1929) . Adjacent properties are either vacant or <br /> commercial and industrial developments . A site vicinity map <br /> is shown in Figure 1. <br /> Mobil Oil Corporation abandoned the former bulk storage and <br /> distribution plant in 1988. All structures were removed from <br /> the property including one underground gasoline and four <br /> F above-ground diesel fuel storage tanks. <br /> t In August 1988 , following removal of the underground gasoline <br /> storage tank, two soil samples and one ground water sample <br /> were collected and analyzed for hydrocarbon constituents . <br /> Soil and ground water analytical results detected the <br /> presence of total petroleum hydrocarbons (TPH) , and benzene, <br /> toluene, ethylbenzene, and xylenes (BTEX) . <br />