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Site Background Information Quick N Save 42 Page 3 of 4 DISPOSAL OF HYDROCARBON-IMPACTED SOIL ' On 25 May 2000, 522 cubic yards(approximately 639 tons)of excavated soil from the former UST and former UST area was disposed at Forward Landfill 1 WASTE OIL UNDERGROUND STORAGE TANK REMOVAL ' One waste oil UST (500-gallon)was removed from the site on 13 March 2001 Following removal of the tank,a backhoe was used to collect a soil sample from 2 feet below the end of the former UST ' A composite-soil sample was collected from the soil stockpile TPH-d was detected in the stockpile sample and the waste oil UST pit sample at concentrations of 440 mg/kg and 280 mg/kg, respectively BTEX compounds and polycholonnated-biphenyls were not detected in soil samples ' analyzed ' MONITORING WELL INSTALLATION ' On 17 and 18 March 2004,four soil borings(MW 1 through MW3 and B 1)were advanced at the site A CME-75HT truck mounted drill ng was utilized to advance 8 25-mch diameter hollow-stern augers to the total depth of each boring, 50 feet bsg in boring B1 and 45 feet bsg in borings MWI ' through MW 3 Pilot borings MWI, MW2 and MW3 were completed as ground water monitoring wells using 2-inch diameter PVC casing,with 0 020-inch slotted screen installed from approximately 25 feet to 45 feet bsg The filter pack(No 2/12 Lonestar sand)was installed from approximately 23 I feet to 45 feet bsg, and a nominal 2-foot bentonite chip plug was then installed above the filter pack and hydrated The wells were then grouted to near the surface with portland cement,and water-tight, traffic-rated well boxes were installed over the wells IGenerally, an orange-brown, dry, clayey silt (fill matenal),was encountered from surface grade to approximately 6 feet bsg Orange brown to brown, dry, silts, clayey silts and silty sands were ' encountered from approximately 6 feet bsg to 16 feet bsg in borings MW 1, MW2 and B 1 and from approximately 6 feet to 26 feet bsg in MW3 Orange brown to blue grey hydrocarbon stained,moist, clay was encountered from approximately 16 feet to 31 feet bsg in MWI, MW2 and BI and from 26 to 31 feet bsg in the area of MW3 Gray hydrocarbon stained, moist to saturated silty sand was encountered from approximately 31 feet bsg to 45 feet bsg in borings MW2,MW3 and B 1 and from 31 feet bsg to 36 feet bsg in boring MW1 Blue hydrocarbon stained, clay was encountered from Iapproximately 36 feet bsg to 45 feet bsg in soil boring MWI and from 46 feet bsg to 50 feet bsg in boring B 1 ITPH-g was detected in soil samples collected from borings MW3 and BI at maximum concentrations in each boring of 8 mglkg(MW3-30)and 49 mg/kg(B1-35),respectively Benzene, IAdvanced GeoEnvironmentai,Inc