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i ISite Background Information Mel Bokides Petroleum - Linden Page 2 of 5 I The composrted stockpile soil samples contained TPH-g at concentrations ranging from 1,900 mg/kg to 2,100 mg/kg BTEX compounds ranged from below laboratory detection limits (benzene in sample SPA-D)to 280 mg/kg (xylenes in sample SPH-L) MTBE, TAME and TBA were detected as high as 3,000 µg/kg, 240 µg/kg and 3,500 Mg/kg, respectively AGE calculated that approximately 126 gallons of gasoline were removed in the soil excavated during the interim remediation The highest concentrations of petroleum hydrocarbon compounds I left in place were detected in the sample collected from the western wall of the former excavation Lower concentrations of petroleum hydrocarbons as gasoline were also detected in the floor sample and samples collected from the north and west sidewalls Fuel oxygenates,including MTBE,TAME Iand TBA were detected in all samples SITE ASSESSMENT On 15 through 17 October 2 00 1, six soil borings (B1 through 136) were advanced at the site, three Isoil borings, B1 through B3, were established as ground water monitoring wells MW-1 through MW-3, respectively Soil in the area of boring B1 (MW-1) and borings B4 and 135 were found to contain high concentrations of petroleum hydrocarbons at depths of 15 bsg, with reduced concentrations encountered at depths to 70 feet bsg Groundwater monitoring data from the initial ground water monitoring event on 02 November 2001 indicated that ground water was flowing towards the northeast, and was locally impacted by the oxygenated fuel additive MTBE On 27 September 2002,monitoring well MW-1 was destroyed by drilling out the entire boring length and backfilling with neat cement and bentonite in the upper 15 feet of the excavation Additionally, the domestic on-site well was destroyed by percussion explosion and backfilled with a sand and cement mix ADDITIONAL SITE ASSESSMENT AND REMEDIATION FEASIBILITY On 09 through 11 September 2003,a total of seven soil borings were advanced at the site boring B6' Iwas advanced north of the excavation area at a 20 degree angle, to an extent of 80 feet, B7 was advanced southeast of well MW-2 to 70 feet bsg, boring MW-1R was installed east of the former UST area to 100 feet bsg, vapor well VW 1 B was advanced under the building at a 20 degree angle to an extent of 40 feet, VW 1 A was installed east of the former UST area to 70 feet bsg, V W2 was installed east of the former UST area to 40 feet bsg and VW3 was installed south of well MW-3 to Advanced GeoEnvironmental I