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PROPOSED SCOPE OF WORK <br /> for <br /> SUBSURFACE INVESTIGATION AND SOIL REMEDIATION <br /> Mobil Oil. Corporation <br /> ;.. Former Bulk Plant <br /> 500 East Grantline Road <br /> Tracy, California <br /> j . INTRODUCTION <br /> This work plan presents the proposed scope of work to conduct <br /> a supplemental investigation of soil contamination, soil <br /> excavation, and initial investigation of potential ground <br /> water contamination at the former Mobil Oil Faulk Plant, <br /> located at 500 East Grantline Road, Trac <br /> site location is shown in Figure 1 , � ' California. The <br /> The scope of work proposed herein was based on the results <br /> preliminary site investigative work completed by others andof <br /> is designed to characterize the concentrations and <br /> distribution of subsurface hydrocarbon contamination. <br /> Results of this investigation will be used to delineate the <br /> ureas of soil contamination for excavation, and to determine <br /> the most appropriate facility for disposal of contaminated <br /> soil. <br /> PROJECT 13ACKGROUND <br /> 7 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 /> above ground diesel fuel storage tanks. Figure 2 shows the <br /> locations of the former structures and tanks: In <br /> 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 fuel hydrocarbon <br /> constituents. LaboratorlY results indicated the presence of <br /> total petroleum hydrocarbons (TPH) , and benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX) in both the soil and <br /> water. samples..._.._ .. .. ground <br /> r On .November 21, 1.988, six exploratory borings were drilled at <br /> the site to depths ranging from 12 to 13 feet. Analyses of <br /> the soil samples collected from 5 and 10 feet below grade <br /> showed detectable levels of TPH as .diesel of up to .2, 900 <br /> �.r <br /> 1 <br />