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S E C O R Conceptual Site Model Chevron Service Station#9-6171 March 25, 2005 IPage 16 • Former Norge Cleaning Village, located at 878 Lincoln Center, Stockton, California • Jack Fuller Properties/Former Service Station, located at 911 Clarane Avenue, Stockton, California A discussion of each of these potential sources is presented below 61 Chevron Service Station #9-6171 — 6633 Pacific Avenue A discussion of the site is presented in sections 3 through 5 6.2 Shelf Service Station— 6131 Pacific Avenue The site Is currently an active Shell station and is located on the southwest corner at the intersection of Pacific and Porter Avenues The initial site layout Included a kiosk located between four canopied pump islands The site was remodeled between 1991 and 1995 to remove the kiosk and replace it with a convenience center In June 1990, Aegis Environmental Consultants (AEC) removed three single walled USTs (one 8,000-gallon capacity and two 10,000-gallon capacity) and associated product piping from the UST pit on the northwest edge of the property The excavation was backfilled with original material and brought to grade with imported fill Three 12,000-gallon double walled USTs and product piping were subsequently Installed on northeast edge of the property 6.2.1 Soil Sampling and Analyses P 9 Y In June 1990, 14 soil borings were advanced into the existing UST pit and into the proposed area of the new UST pit One soil boring (B-1) was drilled on the north of the proposed tank location pit to determine depth to groundwater Groundwater was encountered approximately 53 feet bgs Four soil borings (B-2 to B-5) were drilled near the corners of the existing tank basin The soil samples recovered contained TPI-Ig ranging from below method detection limits to 17,000 mg/kg (B-3/3) The BTEX constituents recovered contained benzene from below method detection limits to 400 mg/kg (B-3/3), toluene from below method detection limits to 600 mg/kg (B-3/10), ethylbenzene from below method detection limits to 200 mg/kg (B-3/3), and xylene from below method detection limits to 830 mg/kg (B-3/3) Three exploratory soil borings (B-6 to B-8) were advanced to determine the lateral extent of hydrocarbon contamination Soil borings B-6 and B-7 were located south of the station kiosk and adjacent to the existing tank pit TPI-Ig was not detected at or above the method detection limits in soil samples collected from these borings However, BTEX ranging from below the method detection limits to 0 019 mg/kg (B-7/9), 0 11 mg/kg (B-7/9), 0 011 mg/kg (B-6/6), and 0 033 mg/kg (B-719), respectively, was detected Soil boring B-8 was drilled north of the station kiosk and adjacent to the proposed replacement tank pit Soil samples collected from this boring contained TPI-Ig N 1Ftles\Projectslchevron\RetaiR#&64711Site conceptual ModelTINAL_CSM doc