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S <br /> SUMMARY OF ENVIRONMENTAL ACTIVITIES <br /> JACKPOT FOOD MART, 14000 E HIGHWAY 88, LOCKEFORD, CALIFORNIA <br /> PROPERTY 04-049 <br /> Current as of February Z 1998 <br /> Unit ground Storage Tank Removal-September 1991 <br /> On September 17, 1991, three underground storage tanks with volumes of 12,000 gallons, 8,000 gallons, <br /> and 6,000 gallons were removed from the subject site The tank removal was performed by Scott Cc <br /> Contractors and consultant services were provided by Canonie Environmental <br /> Upon removal, mild surface corrosion was present on each of the tanks, however, it did not appear that any <br /> of them had leaked In the vicinity of the tank bed, native soil consisted of fine sand and a small amount of <br /> clay was encountered at a depth of 16 feet in the southeast comer of the excavation Groundwater was not <br /> encountered within the excavation to a depth of 20 feet <br /> At the direction of a representative of the San Joaquin County Public Health Services Environmental Health <br /> Division (PHSIEHD), soil samples were collected from the tank excavation and from beneath each of the <br /> former pump islands All samples were submitted to a laboratory and analyzed for total petroleum <br /> hydrocarbons (TPH) as gasoline by EPA Method 8015 and benzene, toluene, ethylbenzene, and xylenes <br /> (BTEX) by EPA Method 8020 Samples collected from beneath the 12,000 gallon tank, 8,000 gallon tank and <br /> pump islands were also analyzed for ethylene dibromide and total lead <br /> TPH was indicated in the samples collected from the tank excavation at concentrations ranging from "non- <br /> detect" to 8,900 ppm, with the highest concentrations being present beneath the west (fill) end of the 8,000 <br /> gallon tank and the east end of the 6,000 gallon tank TPH and BTEX were not detected in the samples <br /> collected beneath the former pump islands <br /> During the removal of the tanks, approximately 150 cubic yards of fill material were removed from the <br /> excavation and placed on plastic sheeting on the east edge of the property Analysis of 6 soil samples <br /> collected from the stockpile 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 of remediating it concurrently <br /> with cleanup of the rest of the site <br /> A copy of Canonie Environmental's "Preliminary Investigation Report' was forwarded to the PHSIEHD and <br /> California Regional Water Quality Control Board (CRWQCB) on January 2, 1992 <br /> Workplan for Additional Site Activities-July 1992 <br /> Based on the results of samples collected during the tank removal, a workplan for the completion of a site <br /> assessment was forwarded to the PHSIEHD and CRWQCB on July 27, 1992 The workplan outlined the <br /> tasks to be completed during site assessment <br /> 1 A soil vapor survey would be conducted to help define the vertical and lateral extent of contamination <br /> in the area of the former gasoline tanks <br /> 2 Based on the results of the soil vapor survey, soil bonngs would be advanced at the estimated limits <br /> of the contamination plume <br /> 3 Additional borings would be placed within the area of contamination and completed as vapor <br /> extraction wells for use in a future remediation system The wells would be installed to a minimum <br /> depth of 40 feet or to 10 feet below the last observable contamination <br /> Authorization to proceed with the proposed work was received from the PHS/EHD on August 4, 1992 <br />