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1.0 INTRODUCTION <br /> As a result of subsurface petroleum hydrocarbon impact beneath Service Station 9-6171, in <br /> Stockton, California (Figures 1 and 2), Chevron U.S.A. Products Company (Chevron) has <br /> been engaged in an investigation and monitoring program. In order to develop the remedial <br /> approach, Chevron retained Pacific Environmental Group, Inc. (PACIFIC) to prepare this <br /> corrective action plan (CAP). This plan was prepared pursuant to guidelines contained in <br /> California Code of Regulations (CCR) Chapter 16, Article 11. The purpose of the plan is to <br /> provide a framework for remediation, considering all pertinent regulatory guidance, site <br /> conditions, site remediation constraints, and probable future uses of the site. <br /> 1.1 Previous Subsurface Investigations <br /> Soil and groundwater investigations at the site have been conducted by Groundwater Tech- <br /> nology, Incorporated, Dames and Moore, and Sierra Environmental Services (Sierra). Inves- <br /> tigative work included: a soil vapor survey, the installation of groundwater monitoring wells <br /> (MW-1 through MW-7), soil sampling of the former underground storage tanks (USTs) <br /> excavation, well abandonment (MW-1), and a limited off-site source search. <br /> 1.2 Document Format <br /> Within this document, a conceptual site model is developed (Section 2.0), and site water <br /> quality, public health, and safety goals are identified (Section 3.0). The need for remedial <br /> action is outlined in Section 4.0. In Section 5.0, remedial objectives are identified, remedial <br /> technologies are screened and assembled into remedial alternatives, alternatives are evaluated, <br /> and a specific alternative is recommended. An implementation schedule is proposed and is <br /> included herein as Section 6.0. <br /> 3201357B/CAPREV 1 1 June 29, 1995 <br />