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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 was identified as soil and groundwater impacted with weathered gaso- <br /> line The compounds of concern that distinguish residual plume are the constituents of gaso- <br /> line, including benzene, toluene, ethylbenzene, and xylenes compounds <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, institutional, environmental safety, and economic criteria were used to evaluate the <br /> alternatives It was determined that Alternative 1 is the most feasible for long-term applica- <br /> tion Elements of Alternative 1 are <br /> • Groundwater monitoring <br /> • Preparation and implementation of a contingency plan that includes institu- <br /> tional controls <br /> 3201357B1CAP ii April 4, 1995 <br />