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i i03 February 2004 • AGE-NC Project No 98-0500104-1127 iPage 4 of 6 • Separately,TPH-g was detected in ground water samples from wells MW-1,2, 3, 5,7, 8, 26 and 25 associated with the former UST release, at the east edge of the site • TPH-g concentrations ranged from 170 micrograms per liter (µg/1) in well MW-7 to I77,000 µg/lin well MW-1 and separately at concentrations of 770 µg/l and 17,000 µg/1 in samples from wells MW-18 and MW-16,respectively TPH-ss concentrations included 670 µg/1 and 9,000 µg/1 in wells MW-18 and MW-16, respectively • BTEX compounds were detected at the maximum concentrations of 16,000 µg/1 benzene, 12,000 µg/1 toluene, 1,200 µg/1 ethyl benzene and 9,800 µg/1 xylene in the sample from well MW-1,directly west of the former UST dispenser Lower concentrations were also detected in wells MW-2, east of the former USTs, MW-3 south of the of the former UST dispenser and to a lesser degree in the sample from well MW-8 • BTEX compounds were detected at the maximum concentrations of 40µg/1 benzene,79 µg/l toluene, 190µg/1 ethyl benzene and 830µg/1 xylene in the sample from well MW-16,directly west of the suspected stoddard release area Ethylbenzene and xylenes were detected in ground water samples MW-18 at a concentration of 2 9 µg/1 and 3 9 µg/l, respectively • • TBA was detected in seven monitoring well samples above the detection lirmts The detection ' limit in the sample from well MW-1 was raised to 500 µg/1 due to dilutions The maximum concentration of TBA detected was in the samples collected west of the former UST dispensers at 150 µg/1 (MW-8) • 1,2-DCA was detected in a total of twenty-four ground water samples collected from all six of the designated hydrologic units across the site The highest concentration of the 1,2-DCA was detected in well MW-1 at 2,600 µg/l, concentrations decreased in samples collected towards the west of the former UST area to a concentration of 0 8 µg/1 (MW-12), the western most shallow well • EDB was detected in one sample at a concentration of 300 µg/1 (MW-1) • TBA was detected in sample MW-14 at a concentration of 9 3 µg/l MTBE was detected in intermediate-screened sample MW-13 at 2 2 µg/1 Analytical results of the monitoring well ground water samples are summarized in Table 2 The laboratory report(MAI I D 0312513,0312544,0312545),quality assurance and quality control and chain-of-custody forms are presented In Appendix C IAdvanced GeoEnvironmental,Inc