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ATTACHMENT 2 <br /> SUMMARY OF ENVIRONMENTAL ACTIVITIES <br /> JACKPOT FOOD MART, 14000 E HIGHWAY 88, L.00KEFORD,CALIF'ORNIA <br /> . PROPERTY 04-049 <br /> Underground Storage Tank Removal - September 1991 <br /> On September 17, 1991, three underground storage tanks with volumes of 12,000 <br /> gallons, 8,000 gallons, and 6,000 gallons were removed from the subject site <br /> The tank removal was performed by Scott Co Contractors and consultant services <br /> were provided by Canonie Environmental <br /> Upon removal, mild surface corrosion was present on each of the tanks , ,however, <br /> it did not appear that any of them had leaked In the vicinity of the tank bed, <br /> native soil consisted of fine sand and a small amount of clay was encountered at <br /> a depth of 16 feet in the southeast corner of the excavation Groundwater was <br /> not encountered within the excavation to a depth of 20 feet <br /> At the direction of a representative of the San Joaquin County Public Health <br /> Services Environmental Health Division (PHS/EHD) , soil samples were collected <br /> from the tank excavation and from beneath each of the former pump islands All <br /> samples were submitted to a laboratory and analyzed for total petroleum <br /> hydrocarbons (TPH) as gasoline by EPA Method 8015 and benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX) by EPA Method 8020 Samples collected from <br /> beneath the 12,000 gallon tank, 8,000 gallon tank and pump islands were also <br /> analyzed for ethylene dibromide and total lead <br /> TPH was indicated in the samples collected from the tank excavation at <br /> concentrations ranging from "non-detect" to 8 ,900 ppm, with the highest <br /> concentrations being present beneath the west (fill) end of the 8 ,000 gallon tank <br /> and the east end of the 6,000 gallon tank TPH and BTEX were not detected in the <br /> samples collected beneath the former pump islands <br /> During the removal of the tanks, approximately 150 cubic yards of fill material <br /> were removed from the excavation and placed on plastic sheeting on the east edge <br /> of the property Analysis of 6 soil samples collected from the stockpile <br /> indicated TPH levels ranging from "non-detect" to 2700 ppm After collection of <br /> the samples, the fill sand was used to backfill the excavation with the intention <br /> of remediating it concurrently with cleanup of the rest of the site <br /> A copy of Canonie Environmental's "Preliminary Investigation Report" was <br /> forwarded to the PHS/EDH and California Regional Water Quality Control Board <br /> (CRWQCB) on January 2, 1992 <br /> Workvlan for Additional Site Activities - July 1992 <br /> Based on the results of samples collected during the tank removal, a workplan <br /> for the completion of a site assessment was forwarded to the PHS/EHD and CRWQCB <br /> on July 27, 1992 The workplan outlined the tasks to be completed during site <br /> assessment <br /> i <br /> 1 A soil vapor survey would be conducted to help define the vertical and <br /> lateral extent of contamination in the area of the former gasoline tanks <br /> . 2 Based on the results of the soil vapor survey, soil borings would be <br /> advanced at the estimated limits of the contamination plume <br />