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EXECUTIVE SUMMARY <br /> This corrective action plan (CAP) serves as the framework for implementing a long-term <br /> strategy for remediation at Chevron U.S.A. Service Station 9-6171. Preparation of this CAP <br /> was accomplished considering all investigative and remedial data generated to date, as well as <br /> State Water Control Board Resolutions 68-16, 88-63, 92-49, and California Code of Regula- <br /> tions (CCR), Title 23, Chapter 16, Article 11. <br /> A review of all pertinent data was completed and summarized in a conceptual site model. The <br /> model served as a basis for generating remedial objectives and associated response actions. It <br /> was determined that the primary source of petroleum hydrocarbon residuals beneath the site <br /> was the former product storage and distribution facilities. The secondary source of petroleum <br /> hydrocarbon residuals were identified as groundwater and potentially the capillary fringe <br /> impacted with weathered gasoline. The compounds of concern that distinguish residual plume <br /> are the constituents of gasoline, including benzene, toluene, ethylbenzene, and xylenes <br /> compounds. The physical and chemical characteristics of these compounds are summarized in <br /> Table 1. <br /> Subsequent to preparing the site conceptual model, site-specific environmental, public health, <br /> and safety goals were developed and site water quality (environmental) goals were identified. <br /> Water quality goals linked with using groundwater as a municipal supply were specified. The <br /> site public health and safety goal was specified to eliminate the potential for exposure to, or <br /> use of, impacted groundwater. <br /> Predicated on the need to achieve the site-specific environmental, public health, and safety <br /> goals, groundwater-based remedial objectives were established. Appropriate response actions <br /> were identified and associated technologies were combined into remedial alternatives. Two <br /> alternatives were evaluated: (1) Intrinsic Remediation (Alternative 1), and (2) Soil Vapor <br /> Extraction/Air Sparging (Alternative 2). <br /> Technical, environmental safety, and economic criteria were used to evaluate the alternatives. <br /> It was determined that Alternative 1 is the most feasible for application. Elements of <br /> Alternative l are: <br /> • groundwater monitoring, and <br /> 3201357B/CAPREVI H June 29, 1995 <br />