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Former Discovery Chevrolet June 5 199$ <br /> Tracy,Califomia Corrective Action Plan <br /> 1.1 Site Location <br /> The subject site is a former automobile dealership located at 1615 11th Street in Tracy, <br /> California (Figure 1). The elevation of the site is approximately 44 feet above mean sea <br /> level (MSL). <br /> 1.2 Previous Site Work <br /> In the Background section of the Problem Assessment Report, Horizon prepared a summary <br /> of the environmental site work performed at the site between 1993 and 1997. Historical <br /> laboratory analytical results were included in Tables and Figures in Appendix B of <br /> Horizon's Problem Assessment Report. <br /> 1.3 Remedial Work Objectives <br /> In Horizon's Problem Assessment Report, a brief discussion was presented for the various <br /> soil and groundwater remediation alternatives that likely would apply for the site. The soil <br /> remediation alternatives discussed were passive remediation, in-situ soil vapor extraction, <br /> excavation and disposal, and excavation and aboveground treatment consisting of various <br /> methods of aeration, soil vapor extraction, or biotreatment. The groundwater remediation <br /> alternatives discussed were passive (or intrinsic) remediation, in-situ bioremediation, air- <br /> sparging, or groundwater extraction, treatment, and disposal. <br /> Based upon the fine-grained soils present beneath the site and previous discussions with the <br /> SJC PHS/EHD, the most feasible method for soil remediation at the site would be <br /> excavation and disposal, or excavation and aboveground treatment of the hydrocarbon- <br /> impacted soils, and removal and disposal of hydrocarbon-impacted groundwater from the <br /> excavation, along with groundwater monitoring for a short period of time to evaluate the <br /> effectiveness of the remedial work. <br /> 1� <br /> 3001-21.cap 2 HORIZON ENVIRONMENTAL INC. <br />