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SOIL REMEDIATION PLAN <br /> Conway Property - 381 West Taddei Road <br /> Acampo, California <br /> 1. 0 INTRODUCTION <br /> In accordance with a request from Mr. Ron Conway, Geological Audit <br /> Services, Inc. (GeoAudit) has prepared this soil remediation plan <br /> for contaminated soil at 381 West Taddei Road, Acampo, California <br /> (the site) . The soil was removed from the excavation of a former <br /> underground storage tank (UST) and stockpiled on-site in May 1993 . <br /> 2 .0 BACKGROUND <br /> 2. 1 Land Use <br /> The site is located in a relatively flat rural area of northwestern <br /> San Joaquin County. The property is part of a small rural <br /> subdivision. The surrounding area is used primarily for <br /> agricultural purposes (grape vineyards) . The Mokelumne River lies <br /> . approximately 1,200 feet south and a slough lies approximately 500 <br /> feet north of the site. The location of the site is illustrated in <br /> Figure 1. A plan of the site is illustrated in Figure 2 . <br /> 2.2 Previous Work <br /> It is our understanding that one 500-gallon leaded gasoline tank <br /> and one 350-gallon unleaded gasoline tank were removed from the <br /> site on October 31, 1989 . The tanks were owned and operated by Lodi <br /> Concrete Pipe Service, which owned the property and was located at <br /> the site. A slight hydrocarbon odor was noted in the soil under the <br /> tanks after the tanks were removed. TPH as gasoline and BTE&X were <br /> detected in both soil samples that were collected from beneath the <br /> tank. <br /> The property was subsequently sold to Mr. and Mrs. Ron Conway, and <br /> a workplan for overexcavation to remove the contaminated soil was <br /> submitted in July 1990. Excavation was performed on July 18 , 1990, <br /> and five soil samples were collected from the walls and floor of <br /> the cavity when excavation was terminated. Hydrocarbon odors were <br /> noted in two samples. Laboratory analyses detected significant <br /> concentrations of petroleum hydrocarbons in both samples (TPH as <br /> gasoline at 4 , 000 ppm and 10, 000 ppm; benzene at 62 ppm and 41 ppm; <br /> toluene at 87 ppm and 430 ppm; ethylbenzene at 35 ppm and 150 ppm; <br /> and xylene at 293 ppm and 850 ppm) . <br /> . Further assessment of contamination at this site was requested by <br /> the San Joaquin County Public Health Services - Environmental <br /> Health Division (PHS/EHD) . In February 1993 , GeoAudit was retained <br /> to perform a soil and groundwater investigation at the site. <br /> 1 <br />