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0 9 <br /> Geological Technics Inc. <br /> 1172 Kansas Avenue <br /> Modesto.California 95351 <br /> (209)522-4119/Fu(209)522-4227 <br /> www.etienv.com <br /> Remedial Action <br /> Work Plan <br /> George's Service <br /> 1600 Durham Ferry Road <br /> Tracy, California <br /> Project No. 425.2 <br /> June 29,2011 <br /> 1. EXECUTIVE SUMMARY <br /> The purpose of this Remedial Action Plan is to provide details on the selected alternative for <br /> a proposed remedial action to address the residual contaminated soil and groundwater at the <br /> George's Service site located at 1600 Durham Ferry Road, in compliance with the provisions <br /> of Section 25356.1 of the California Health and Safety Code. <br /> The Site, located at the intersection of Highway 33 and Durham Ferry Road, has been owned <br /> and operated by George and Mei Teranishi since the 1940's as an automobile repair facility <br /> and market. Gasoline was sold at the Site until 1990, when the tanks were removed. A <br /> residence, shed and barn are present on the property in addition to the George's Service <br /> building. The site is currently vacant. <br /> GTI has been conducting the on-going soil and groundwater investigation since 1997, which <br /> has included subsurface boring, on-going groundwater monitoring, removal action and pilot <br /> test studies at the site. Petroleum hydrocarbon contamination has been reported to be present <br /> in the soil and groundwater at the site. <br /> In 2002, a removal action was conducted at the site where contaminated soil was excavated <br /> from the subsurface. Several remedial options have been evaluated to address the remaining <br /> contamination in the soil and groundwater, including excavation, in-situ chemical oxidation, <br /> pump and treat, monitored natural attenuation, soil vapor extraction, and air sparging. Based <br /> on the on-going soil and groundwater investigations and site conditions, it has been <br /> determined that air sparging combined with low vacuum soil vapor extraction is a feasible <br /> remedial technology for addressing the remaining soil and groundwater contamination at the <br /> site. The proposed remedial action includes utilizing existing vapor extraction wells, and <br /> installing three air sparging points, along with associated equipment, monitoring and <br /> sampling required for successful remediation of the site. <br /> C7eologicai7-echnics Ptc. 1 <br /> 4252 RAP.docx <br />