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1 <br /> Qatogicat recce Inc. <br /> ' <br /> 1101 7`h Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> Feasibility Study <br /> ' George's Service <br /> 1600 Durham Ferry Road <br /> ' Tracy, California <br /> Project No 425 2 <br /> ' April 28, 2004 <br /> ' 1.0 INTRODUCTION <br /> The site, located at the intersection of Highway 33 and Durham Ferry Road, has been <br /> owned and operated by George and Mei Teranishi since the 1940's as an automobile repair <br /> facility 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 (Del-Tech) Three monitoring wells were installed in early <br /> 1995 and elevated levels of petroleum hydrocarbons were detected on the northern and <br /> western sides of the property <br /> ' In January of 1997, Geological Technics Inc (GTI) contracted with Mr and Mrs Teranishi <br /> to 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 /> GTI installed five new water-table monitoring wells and one intermediate depth, discretely <br /> screened, monitoring well In mid 1998, GTI installed two additional intermediate depths, <br /> discretely screened, monitoring wells and one deep discretely screened, monitoring well <br /> Quarterly groundwater monitoring reports have been submitted throughout the project <br /> In late July of 2001, GTI and Del-Tech performed a limited soil excavation at the site and <br /> removed approximately 500 cubic yards of contaminated soil Analytical data show that <br /> ' approximately 4,900 pounds of TPH-G were removed from the site At the end of October <br /> 2001, the stockpiled soil was transported and disposed of at Forward Landfill GTI <br /> submitted a report on the soil excavation activities on January 28, 2002 <br /> During the backfill of the excavation, the County inspector reviewed the work in progress <br /> and discussed the issue of the residual contamination left under the building, around the <br /> monitoring wells, and under Durham Ferry Road It was concluded that piping should be <br /> installed for use in a bio-venting project that could extract at a slow rate the vapors emitted <br /> from the residual contamination Subsequently, two pipes were installed to allow for the <br /> operation of a low flow bio-venting/vapor extraction system in and around the excavation <br /> ' On August 20, 2002, GTI prepared and submitted the work plan Additional Soil and <br /> Groundwater Investigation In a letter dated October 21, 2002, Nuel C Henderson, Jr , <br />