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1.0 INTRODUCTION <br />. Valley Motors operates a wholesale used car dealership at 800 East Main Street in Stockton, <br /> California and is owned by Mr Andrew Hyduke Investigation of the extent of hyjrocarbon <br /> contamination beneath the Valley Motors property has been directed by San Joaquin County Public <br /> Health Services, Environmental Health Division (PHS/EHD) <br /> 2.0 BACKGROUND <br /> 2.1 Site Location and Description <br /> The site is located several blocks east of downtown Stockton and several blocks north of Mormon <br /> Slough (Figure 1) It occupies an L-shaped parcel of land at the corner of Main and Gra t Streets <br /> The area is zoned commercial and light industrial Small businesses and a vacant lot are located to <br /> the north, across Main Street, and a paint company is located to the west, across Grant Street The <br /> topography in the area is flat <br /> 2.2 Previous Work <br /> It is our understanding that two UST's were removed from the site by Siebold Corporatio, in 1990 <br /> The tanks were located beneath the sidewalk along Grant Street (Figure 2) They were eportedly <br /> used to store gasoline, although no fuel dispensers were present when the tanks were removed <br />. However, the tanks had not been in use since Mr Hyduke acquired the property about 1981 <br /> William Hunter & Associates conducted a soil investigation in 1994 and drilled 5 bonn;,s (Figure <br /> 2) Forty soil samples were collected for analysis, but only 4 of these contained hydro(arbons at <br /> concentrations above detectable limits The hydrocarbons were reported by FGL Laboratory to be <br /> within the compositional range of Stoddard Solvent, although specific carbon ranges were not <br /> reported The maximum depth at which hydrocarbons were detected was approximat6i 25 feet, <br /> which is approximately 10 feet above the historically highest recorded groundwater level n the site <br /> area(35 feet in 1983) <br /> Upgradient Environmental installed groundwater monitoring well VM-1 in September 1995. <br /> Contaminated soil was detected at a depth of 25 feet, and groundwater samples co lected in <br /> September and October were also contaminated Gasoline, diesel, BTEX, and several c donnated <br /> hydrocarbons were detected in the groundwater <br /> In February 1996, Upgradient collected eight samples from the soil that had been excaval ed during <br /> the UST removal in 1990 This soil was stockpiled at the south end of the site With the approval of <br /> PHS/EHD, part of the stockpile was used to backfill the excavation in April 1996 It is our <br /> understanding that Valley Motors arranged for the removal of the remainder after July, 1906 <br />. 2 <br />