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11 May 1998 AGE-NC Protect No 97-0312 Page 2 of 5 Five ground water monitoring wells were installed at the site between 1990 and 1996, near the fueling island area Petroleum hydrocarbons were detected in soil samples collected during the installation of ground water monitoring well UST-1 to a depth of 80 feet bsg Low concentrations of benzene were detected during the installation of UST-4 Petroleum hydrocarbons were not detected in soil samples collected during the installation of UST-2 or UST-3 Ground water samples were collected on 22 occasions between September 1990 and December 1997 Impacted ground water appears to be centered near UST-1 The well box for UST-1 was found to be in poor condition in 1993, and surface infiltration of water and fuel had occurred, floating product was encountered in UST-1 Ground water extraction from UST-1 was performed between July 1993 and August 1995 as interim remediation Approximately 55 gallons of water and product were extracted every two weeks Previous activities at the site were described in numerous quarterly reports prepared by Environmental Science & Engineering, Inc (ESE) between June 1990 and February 1997 23 UST REMOVAL On 18 September 1998, six USTs were removed from the site A total of nine UST samples and thirteen piping/dispenser samples were collected and analyzed Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d)were detected in the samples collected beneath the USTs at concentrations as high as 2,500 parts per million (ppm, reported as milligrams per kilogram) and 32,000 ppm, respectively TPH-g and TPH-d were detected in piping/dispenser samples at concentrations as high as 1,200 ppm. and 16,000 ppm, respectively Excavation of additional hydrocarbon-impacted soil was performed after removal of the USTs Procedures and findings were summarized in the UST Removal Report -September 1997 prepared by AGE 24 PURGE WATER DISPOSAL On 17 September 1997,purge water stored at the site was disposed in conjunction with rinsate water related to the UST removals performed at the site Water was transported by Nor Cal Oil to Amenclean, Inc in Silver Springs, Nevada 25 SOIL STOCKPILE SAMPLING Approximately 400 cubic yards of soil were generated during the removal of the USTs at the site On 22 November 1997,the stockpiled soil was spread to a thickness of approximately three feet On 24 November 1997, a total of 16 samples were collected from the stockpiled soil and analyzed for Advanced CeoEn%iron mental,Inc