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Geological Teck�ics lac. <br /> 1101 7'°Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax#522-4227 <br /> Work Plan <br /> Geoprobe Site Investigation <br /> George's Station <br /> 1600 Durham Ferry Rd. <br /> Tracy, California <br /> Project No. 425.2 <br /> September 18, 2008 <br /> 1.0 INTRODUCTION <br /> 1.1 Purpose & Goal <br /> The purpose of this work plan is to investigate the horizontal and vertical extent of the <br /> gasoline based contaminants plume on the north side of the site and under Durham Ferry <br /> Road. The investigation will be conducted by direct push drilling methods. <br /> The goal of this investigation is to obtain required information for Oxygen Releasing <br /> Compound injection design originally proposed in remedial action plan prepared by GTI <br /> dated November 29, 2007. <br /> 1.2 Site History <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. <br /> The site has been undergoing site characterization work commencing 1995 by Del-Tech <br /> Geotechnical Support Services. Three monitoring wells were installed in early 1995 and <br /> elevated levels of petroleum hydrocarbons were detected on the northern and western sides of <br /> the property. <br /> In January of 1997 Geological Technics Inc. (GTI) contracted with Mr. and Mrs. Teranishi to <br /> provide additional site characterization work regarding the definition of the lateral and <br /> vertical extent of petroleum hydrocarbons in the soil and groundwater. In early April 1997, <br />