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Feasibility Study Report Former CURTISS PONTIAC-BUICK 2450 Toste Road,Tracy, California 1.0. INTRODUCTION At the request of Mr. Joe Toste, Jr.,Advanced GeoEnvironmental, Inc. (AGE) has prepared this Feasibility Study Report(FS)for the former Curtiss Pontiac-Buick site located at 2450 Toste Road, Tracy, California (site). The FS was prepared as directed by San Joaquin County Environmental Health Department(EHD)letter,dated 21 December 2007. The scope of the FS was to evaluate the feasibility and cost aspect of two remedial action alternatives for the remaining petroleum hydrocarbon-impacted ground water at the site. The location of the site is illustrated on Figure 1;a plan view of the site is illustrated on Figure 2. Site background information is summarized in Appendix A. The FS was prepared in accordance with guidelines established by the Central Valley Regional Water Quality Control Board for the subsurface investigation of underground storage tank sites. 2.0. GROUND WATER REMEDIATION ALTERNATIVES AGE recognizes that two methods for remediation are readily applicable for the contamination at the site.These two methods are:(1)ground water extraction/treatment and disposal and(2)in-situ ozone oxidation-sparging (in-situ chemical oxidation). 2.1. GROUND WATER EXTRACTION There are several different methods for treatment of extracted ground water,which are collectively called "pump and treat'. As the name indicates, all methods involve extraction and transfer of contaminated ground water from the aquifer to an above-ground treatment or disposal/recycling facility.The extraction is performed using an automatic pump system to maintain a hydraulic capture based on the characteristics of the aquifer and to ensure that process volume requirements are maintained for an adequate pore volume exchange of ground water. After treatment, the water is usually discharged into a sanitary sewer. 2.1.1. Ground Water Treatment Methods The documented presence of dissolved hydrocarbons will require treatment for the recovered water. Two of the most common methods of water treatment are air stripping and carbon adsorption. Air stripping involves removal of volatile organic compounds from ground water by promoting the transfer ofcontaminants from the dissolved phase to the vapor phase.The process usually works well with volatile organic compounds,but less successfully with longer-chained hydrocarbons, such as Advanced GeoEnviromneatid,Inc.