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} EXECUTIVE SUMMARY This corrective action plan (CAP) serves as the framework for implementing a long-term strategy for remediation at former Chevron U S A Service Station 9-1918 Preparation of this CAP was accomplished considering all investigative and remedial data generated to date, as well as SWRCB Resolutions 68-16, 88-63, 92-49, and California Code of Regulations, Title 23, Chapter 16, Article 11 A review of all pertinent data was completed and summarized in a conceptual site model The model served as a basis for generating remedial objectives and associated response actions It was determined that the primary source of petroleum hydrocarbon residuals beneath the site was the former product storage and distribution facilities The secondary source of petroleum hydrocarbon residuals was identified as soil and groundwater impacted with weathered gaso- line The compounds of concern that distinguish the residual plume are the constituents of • gasoline, including benzene, toluene, ethylbenzene, and xylenes Subsequent to prepanng the site conceptual model, site-specific environmental, public health, and safety goals were developed Site water quality (environmental) goals were identified and were determined as the acluvement of background water quality conditions Concentration limits, the minimum standard, are premised upon using groundwater a municipal supply The site public health and safety goal was specified to eliminate the potential for exposure to, or use of, impacted groundwater Predicated on the need to achieve the site-specific environmental, public health, and safety goals, groundwater and soil-based remedial objectives were established Groundwater and soil remedial measures are necessary to achieve remedial objectives Appropriate response actions were identified and associated technologies were combined into remedial alternatives Two alternatives were evaluated that incorporate soil and groundwater remediation (1) Soil Excavation with Air Sparging of Groundwater (Alternative 1), and (2) Sol] Vapor Ddrac- tion/Bioventing with Air Sparging of groundwater (Alternative 2) Each alternative consid- ered includes common components associated with addressing groundwater impact Technical, institutional, environmental safety, and economic criteria were used to evaluate the alternatives It was determined that Alternative 2 was the most feasible for long-term applica- tion Elements of Alternative 2 are • 32013378/CAP_AND DOC n November 30, 1995