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t r • SUMMARY OF ENVIRONMENTAL ACTIVITIES ,JACKPOT FOOD MART, 14000 E HIGHWAY 88, 04 049 LOCKEFORD, CALIFORNIA PRO current as of iWay 19, 9997 Under round Stora a Tank Removal - Se tember 1991 On September 17, 1991,three underground storage tanks with volumes of 12,000 gallons, 8,000 gallons, and 6,000 gallons were removed from the n5services were provided by Canon e Environmental ject site The tank las performed by Scott Co Contractors and consultant Upon removal, mild surface corrosion was present on each of the tanks, however, it did not appear that any of them had leaked In the vicinity of the tank bed, native soil consisted of fine sand and a small amount of clayawas encountered at a s not encountered withinh of 16 feet in the to a depth of 20 feet comer of the excavation Groundwater w et At the direction of a representative of the San Joaquin County Public Health Services Environmental Health Division (PHSIEHD), soil samples were collected from the tank excavation and from beneath each of the former pump islands All samples were submitted to a laboratory andanalyzed for en total petroleum hydrocarbons (TPH) as gasoline by EPA Method 8015 and benzene, and xylenes (BTEX) by EPA Method 8020 Samples collected from beneath the 12,000 gallon tank, 8,000 gallon tank and pump islands were also analyzed for ethylene dibromide and total lead TPH was indicated in the samples collected from the tank excavation at concentrations ranging from "non-detect" to 8,900 ppm, with the highest concentrations being present beneath the west (fill) end of the 8,000 gallon tank and the east end of the 6,000 gallon tank TPH and BTEX were not detected in the samples collected beneath the former pump islands During the removal of the tanks, approximately 150 cubic yards of fill material were removed from the excavation and placed on plastic sheeting on the east edge of the property Analysis of 6 soiilsamAples fter collected from the stockpile indicated TPH levels ranging from "non-detect" to 2700 pp collection of the samptes, the el fill of thesrest odto f the site kfll the excavation with the intention of remediating it concurrently A copy of Caname Eal Water Quality Coriirol Board (CRWQCB) on Jinary Investigation anuary 2was g2 forwarded to the PHSIEHD and Califomia Region Work lan for Additional Site Activities- Jul 1992 Based a the results was orwarded to ples the HSIEHD a d CRWQCB on July 27llected during the tank removal, a ,1992 an for The workp a completion outl ned site assessment was f the tasks to be completed during site assessment 1 A soil vapor survey would be conducted to help define the vertical and lateral extent of contamination in the area of the former gasoline tanks 2 Based on the results of the soil vapor survey, soil borings would be advanced at the estimated limits of the contamination plume 3 Additional bonngs would be placed within the area of contamination and completed as vapor extraction wells for 40 feet or touture 10 feet below)ation system Te wells would the last observabhbe installed to a minimum depth of e contamination Authorization to proceed with the proposed work was received from the PHSIEHD on August 4, 1992