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15 February 2002 AGE-NC Project No 99-0559 Page 5 of 7 Hydrologic units I and 2 TPH-g was detected in the groundwater samples collected from the wells at concentrations ranging from 3,000 micrograms per liter(µg/1) in sample MW-6A to 290,000 µg/1 in sample MW-2 There was no detection of TPH-g in sample MW-8A above the method reporting limit Benzene was detected in six samples from units 1 and 2 at concentrations ranging 350 µg/1 in sample MW-6A to 44,000 µg/1 in sample MW-2 The remaining BTEX compounds detected in the six shallow samples ranged from 0 66 µg/1 of ethylbenzene in sample MW-8A to 67,000 µg/1 of toluene in MW-2 MTBE was detected in units 1 and 2 samples utilizing EPA Method 8020 at concentrations ranging from 1,500 µg/1 in MW-7A to 130,000 µg/1 in samples MW-2 and MW-4 MTBE concentrations detected by EPA Method 8260 Modified ranged from 1 3 µg/1 in sample MW-8A to 15 0,0 00 µg/l in sample MW-4 The remaining fuel oxygenates were not detected in the hydrologic unit samples Hydrologic unit 4 TPH-g was detected in the ground water samples collected from the fourth hydrologic unit at concentrations ranging from 400 µg/1 in sample MW-6B to 2,600 µg/1 in sample MW-7B There was no detection of TPH-g in sample MW-5B or MW-8B above the reporting limit Benzene was detected in six samples from unit 4 at concentrations ranging from 2 4 µg/1 in sample MW-5B to 140 µg/1 in sample MW-7B The remaining BTEX compounds detected in the four • samples collected from unit 4,had concentrations ranging from 15 µg/1 xylene in sample MW-8B to 480 µg/1 xylene in MW-7B MTBE was detected in two unit 4 samples, utilizing EPA Method 8020, at concentrations of 40 µg/1 in sample MW-6B and 880 µg/1 in sample MW-5B MTBE concentrations detected by EPA Method 8260 Modified ranged from 9 7 µg/1 in sample MW-7B to 740µg/1 in sample MW-5B The remaining fuel oxygenates were not detected in the hydrologic unit samples Hydrologic unit 5 upper TPH-g was detected only in the ground water sample collected from well MW-7C from unit 5 at a concentration of 830µg/1 Benzene was detected in two samples from unit 5 I at concentrations of 1 0µg/1 in sample MW-6C to 110µg/1 in sample MW-7C The remaining BTEX compounds were detected in the four samples collected from unit 3A,at concentrations ranging from 0 78 µg/I xylene in samples MW-8C to 160µg/1 toluene in MW-7C MTBE onlywas detected in one 3C sample, utilizing EPA Method 8020, at a concentration of 160 µg/1 in sample MW-5C MTBE concentrations detected by EPA Method 8260 Modified ranged from 4 0 µg/1 in sample MW-7C to 170 µg/1 in sample MW-5C The remaining fuel oxygenates were not detected in the hydrologic unit samples Hydrologic unit 5 lower TPH-g was detected in the ground water sample collected from unit 5 at a concentration of 990 µg/1 in sample MW-7D, the only sample containing TPH-g Benzene was detected in two samples from unit 3B at concentrations of 0 76 µg/1 in sample MW-6D to 74 µg/1 in sample MW-7D The other BTEX compounds were detected in the four samples collected from unit 5 at concentrations ranging from 0 55 µg/1 toluene in sample MW-6D to 180 µg/1 toluene in •y MW-7D MTBE was detected in one unit 5 sample,utilizing EPA Method 8020, at a concentration Iof 150 µg/l in sample MW-5D MTBE concentrations detected by EPA Method 8260 Modified Advanced GeoEnvnronmental,Inc