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Site Background Information: Den's Auto Repair Page 2 of 8 A search of the SWRCB's GeoTracker database listed two destroyed City of Stockton wells, formerly located approximately 1,000 feet northwest of the site(Table 1;Figure 3).Also,in addition to the Den's Auto site,site th mgnitoi and/or remediation wells were to ated within 2,000 feet of the Den's Auto site Table 1; Figure 3). On 17 October 2006,AGE representatives performed a site reconnaissance for visually observable potential sensitive receptors located within an approximately 2,000-foot radius of the site; one industrial well was located at 817 South Center Street. No other visible potential receptors were noted during the reconnaissance. UNDERGROUND STORAGE TANK REMOVAL n 25 and 26 May 1995, four underground storage to s (USTs) and their associated piping were r owed from the site by Valley Environmental So uA (VES) of Stockton, California.-One Ili 8,000-gallon eaded gasoline UST,one 7,000-gallon u "Feed gasoline UST,and one 5,000-gallon �� unleaded gasoline UST were removed from a large excavation north of the repair facility building; ^ a single 500-gallon waste oil UST was removed from an excavation locatedonthe south side of the 'U building(Figure 2). Upon removal of the USTs, soil samples were collected from beneath each UST, the piping areas, and the excavated soil.Total petroleum hydrocarbons quantified as gasoline(TPH-g)were detected in the soil samples at concentrations as high as 9,100 milligrams per kilogram (mg/kg) in sample TK3-N, collected from the northernboundary of the property. PREVIOUS SITE ASSESSMENT On 23 June 1997 three soil probe borings (B-1through B-3) were advanced at the site. Three additional soil borings(B-4 through B-6)were advanced and completed as ground water monitoring wells on 08 to 11 September 1997; boring B-4 (MW-1) was advanced at the western edge of the station parking lot,boring B-5 (MW-2)was advanced at the north end of the driveway entrance to the parking lot, and boring B-6 (MW-3) was advanced at the eastern edge of the.parking lot. Analytical results of soil samples collected from the soil borings are summarized on Tables A 1 and A2; indicated that: . • Hydrocarbon-impacted soil was present in the vadose zone below the former UST location, within the saturated zone in the vicinity of the newly installed well MW-1, and distributed in the capillary zone. Soil encountered at 35 feet bsg in the boring established for well MW-1 was not impacted by detectable concentrations of petroleum hydrocarbons, while soil at depths between-43feet and-70 feet-bsg was impacted-by petroleum-hydrocarbons.---- ----.�- --------!, Advanced Geo Environmental,Inc. I