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' 18 July 2002 AGE-NC Project No 96-0254 ' Page 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 area 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') ' 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 fanalyzed 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 ' 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 ' 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 '• gg/l Laboratory results of grab ground water samples analyzed for petroleum hydrocarbons are summarized in Table 3 ' On 12 and 13 February 1998 five ground water monitoring wells were installed on-site and off-site of the subject property Soil borings B10 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-1 B at concentrations of 220 and 2,000µg/I,respectively TPH-d was detected samples collected from well MW-1B at a concentration 160µg/I Benzene was detected in samples collected from wells MW-lA ' and MW-1B at concentrations of 15 lig/t and 530µg/1,respectively Toluene,ethyl benzene and xylenes were also detected in MW-i A and MW-1B at concentration as high as 260 µg/1 (toluene, MW-1B) MTBE was detected in the sample collected from well MW-1B at a concentration 9 9 µg/1 Laboratory results of soil samples analyzed for petroleum hydrocarbons area summarized in Table 2 ' On 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 I northwest to the property line, a total of 11 soil samples were subnutted for analysis In addition, grab ground water samples were collected from borings PB-1,PB-4 and PB-5 and were submitted • for analysis ' Advanced GeoEnwroumen[al,Inc