ARCHIVED REPORTS_XR0004410 - Laserfiche WebLink

Home Browse Search

1.0 INTRODUCTION Valley Motors operates a wholesale used car dealership at 800 East Main Street in ,3tockton, Califorrua and is owned by Mr Andrew Hyduke Investigation of the extent of hyDrocarbon contamination beneath the Valley Motors property has been directed by San Joaquin Cou sty Public Health Services, Environmental Health Division(PHS/EHD) 2.0 BACKGROUND 2.1 Site Location and Description The site is located several blocks east of downtown Stockton and several blocks north of Mormon Slough (Figure 1) It occupies an L-shaped parcel of land at the corner of Main and Gra,t Streets The area is zoned commercial and light industrial Small businesses and a vacant lot are located to the north, across Main Street, and a paint company is located to the west, across Grant Street The topography in the area is flat 2.2 Previous Work It is our understanding that two UST's were removed from the site by Siebold Corporatio i in 1990 The tanks were located beneath the sidewalk along Grant Street (Figure 2) They were E,-portedly used to store gasoline, although no fuel dispensers were present when the tanks were •emoved Howe-ver, the tanks had not been in use since Mr Hyduke acquired the property about 198 William Hunter & Associates conducted a soil investigation in 1994 and drilled 5 Bonn-►s (Figure 2) Forty soil samples were collected for analysis, but only 4 of these contained hydros irbons at concentrations above detectable limits The hydrocarbons were reported by FGL Labora t:)ry to be within the compositional range of Stoddard Solvent, although specific carbon ranges were not reported The maximum depth at which hydrocarbons were detected was approximatel� 25 feet, which is approximately 10 feet above the historically highest recorded groundwater level i n the site area(35 feet in 1983) Upgradient Environmental installed groundwater monitoring well VM-1 in Septernoer 1995 Contaminated soil was detected at a depth of 25 feet, and groundwater samples collected in September and October were also contaminated Gasoline, diesel, BTEX, and several c ilormated hydrocarbons were detected in the groundwater In February° 1996, Upgradient collected eight samples from the soil that had been excavated during the UST removal in 1990 This soil was stockpiled at the south end of the site With the approval of PHS/EHD, part of the stockpile was used to backfill the excavation in Apnl 1996 It is our understanding that Valley Motors arranged for the removal of the remainder after July, 199 5 2