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f� F 18 July 2002 AGE-NC Project No 96-0254 IPage 4 of 17 were as high as 550 mg/kg (B4-9') TPH-g was not detected at depths of 12 to 16 feet in the Iarea of the former USTs,nor was TPH-g detected in the soil sample collected from B6 Total petroleum hydrocarbons quantified as diesel (TPH-d) was detected in the soil sample collected from probe boring B2 at a depth of 8 feet bsg at a concentration of 510 mg/kg • BTEX compounds were detected in soil samples collected from depths of less than 8 feet bsg at concentrations ranging from 0 007 (ethyl benzene, B6-8') to 480 mg/kg (xylene, B5-6') I BTEX compounds were also detected at a depth of 12 feet bsg in borings B2,B3 and B5 No petroleum hydrocarbons or BTEX compounds were detected in the soil sample collected from a depth of 16 feet bsg in the former UST area Laboratory results of soil samples analyzed for petroleum hydrocarbons area summarized in Table 2 • TPH-g was detected in each of the eight grab ground water samples collected from the site I at concentrations ranging from 220 micrograms per liter(µg/1)to 240,000 µg/1 TPH-d was detected in both of the grab ground water samples at concentrations of 44,000 µg/1 and 310,000 µg/1 BTEX compounds were detected in each of the water samples analyzed at I concentrations ranging from 0 56 µg/1 benzene in boring B1 to 20,000 µg/1 of benzene in boring B7 MTBE was also detected at concentrations up to 1,000 µg/1 by EPA Method 8020 However,the highest concentration of MTBE detected by EPA Method 8260 was 180 10 µg/1 Laboratory results of grab ground water samples analyzed for petroleum hydrocarbons are summarized in Table 3 IOn 12 and 13 February 1998 five ground water monitoring wells were installed on-site and off-site of the subject property Soil borings B 10 and B14 were completed as dual-screened ground water monitoring wells MW-2 and MW-1, respectively Soil borings B11,B12, and B13 were completed as conventional ground water monitoring wells MW-3, MW-6 and MW-5, respectively • TPH-g was detected in samples collected from well MW-1A and MW-1B at concentrations of 220 and 2,000µg/1,respectively TPH-d was detected samples collected from well MW-1B at a concentration 160 µg/1 Benzene was detected in samples collected from wells MW-lA and MW-1B at concentrations of 15 µg/1 and 530µg/1,respectively Toluene, ethyl benzene and xylenes were also detected in MW-IA and MW-1B at concentration as high as 260 4g/1 (toluene, MW-1B) MTBE was detected in the sample collected from well MW-1B at a I concentration 9 9 µg/1 Laboratory results of soil samples analyzed for petroleum hydrocarbons area summarized in Table 2 IOn 04 November 1999, six soil probe borings (PBI through PB6) were advanced at the site under EHD oversight Probe borings were advanced in the area of the former USTs, dispenser and ' northwest to the property line, a total of 11 soil samples were submitted for analysis In addition, grab ground water samples were collected from borings PB-1, PB-4 and PB-5 and were submitted • for analysis IAdvanced GeoEnvironmental,Inc I