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SUMMARY OF ENVIRONMENTAL ACTIVITIES <br /> JACKPOT FOOD MART, 14000 E. HIGHWAY 88, LOCKEFORD, CALIFORNIA <br /> PROPERTY 04-049 <br /> Current as of March 12, 1997. <br /> Underground 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 Co. <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 <br /> any of them had leaked. In the vicinity of the tank bed, native soil consisted of fine sand and a small <br /> amount of clay was encountered at a depth of 16 feet in the southeast corner of the excavation. <br /> Groundwater was 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 Services Environmental <br /> Health Division (PHS/EHD), soil samples were collected from the tank excavation and from beneath <br /> each of the former pump islands. All samples were submitted to a laboratory and analyzed for total <br /> petroleum hydrocarbons (TPH) as gasoline by EPA Method 8015 and benzene, toluene, ethylbenzene, <br /> and xylenes (BTEX) by EPA Method 8020. Samples collected from beneath the 12,000 gallon tank, <br /> 8,000 gallon tank and 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 <br /> "non-detect" to 8,900 ppm, with the highest concentrations being present beneath the west (fill) end of <br /> the 8,000 gallon tank 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 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 <br /> collection of the samples, the fill sand was used to backfill the excavation with the intention of <br /> remediating it concurrently with cleanup of the rest of the site. <br /> A copy of Canonie Environmental's "Preliminary Investigation Report" was forwarded to the PHSIEHD <br /> and 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 <br /> site assessment was forwarded to the PHSIEHD and CRWQCB on July 27, 1992. The workplan outlined <br /> the 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 <br /> contamination in the area of the former gasoline tanks. <br /> 2. Based on the results of the soil vapor survey, soil borings would be advanced at the estimated <br /> limits 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 <br /> minimum 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 PHSIEHD on August 4, 1992. <br />