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Site Background Information: Quick N Save#2 AGE-NC Project No. 01-0815 Page 3 of 4 DISPOSAL OF HYDROCARBON-IMPACTED SOIL k. On 25 May 2000, 522 cubic yards (approximately 639 tons) of excavated soil from. the former UST and former UST area was taken to Forward Landfill for disposal. 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 polycholorinated-biphenyls were not detected in the soil r� 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 rig was utilized to advance 8.25-inch diameter hollow-stem 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 MW1,MW2, and MW3 were completed as ground water monitoring wells MW-1, MW-2, and MW-3 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. 2112 Lonestar sand) was LM installed from approximately 23 feet to 45 feet bsg, and a nominal 2-foot bentonite chip plug was installed above the filter pack and hydrated.The wells were grouted to near the surface with portland cement, and water-tight, traffic-rated well boxes were installed over the wells. Generally, an orange-brawn, dry, clayey silt (fill material),was encountered from surface grade to approximately 6 feet bsg. Orange brown to brown, dry silts, clayey silts, and silty sands were 1M encountered froze approximately 6 feet bsg to 16 feet bsg in borings MW1,MW2, and B 1 and from approximately6 feet to 26 feet bsg in MW3.Orange-brown to blue-gray,hydrocarbon stained,moist clay was encountered from approximately 16 feet to 31 feet bsg in MW 1, MW2, and B1 and from +- 26 feet to 31 feet bsg in the area of MW3. Gray,hydrocarbon stained, moist to saturated silty sand was encountered from approximately 31 feet to 45 feet bsg in borings MW2,MW3,and B 1 and from 31 feet to 36 feet bsg in boring MWL Blue, hydrocarbon stained clay was encountered from '— approximately 36 feet to 45 feet bsg in soil boring MW 1 and from 46 feet to 50 feet bsg in boring B1. TPH-g was detected in soil samples collected from borings MW3 and B1 at maximum kw✓ V Advanced GeoEnvironmental,Inc.