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11� ill • 20 January 2004 AGE-NC Project No 95-0109 Page 3 of 4 above the screened intervals of the deep-screened wells MW-15 and MW-17 through MW-19 Data from wells MW-1 through MW-5 were not used to infer ground water flow direction or gradient because these wells are screened at different Intervals than the remaining wells On 05 December 2003, ground water on-site was Inferred to be flowing towards the south The ground water gradient was approximately 0 003 ft/ft Figure 3 Illustrates the contoured ground water elevations, historical ground water flow directions are summarized on Table 4 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g was detected in ground water samples from wells MW-8, MW-9 and MW-14 at concentrations ranging from 400 micrograms per liter(gg/1) in MW-14 to 2,900 µg/l (MW-8) One or more BTEX compounds were detected in the same samples at concentrations as high as 7 5 µg/1 benzene (MW-14), 3 2 gg/l toluene (MW-14), 110 Ag/l ethylbenzene (MW-8) and 240 Pg/1 total xylenes (MW-8) . TBA was detected in the water samples collected from wells MW-9 and MW-14 at concentrations of 6 6 µg/l and 24 gg/l,respectively 1,2-DCA was detected in samples collected from wells MW-7, MW-8, MW-9, MW-11,MW-14 and MW-16 at concentrations ranging from 0 51 gg/1 (MW-7)to 21 µg/1 (MW-16) No additional fuel additives were detected above laboratory reporting limits The analytical results for the December 2003 monitoring event are presented on Table 2 Historical analytical results are summarized on Table 3 The approximate extent of dissolved TPH-g,benzene and 1,2-DCA are depicted on Figures 4, 5 and 6 The laboratory reports (MAI Work Order Number 0309193) and chain-of-custody forms are included in Appendix B 4.0. DISCUSSION AND CONCLUSIONS Based upon data collected from the site, AGE finds Ground water ori-site was inferred to be flowing towards the south The ground water gradient was approximately 0 003 ft/ft TPH-g was detected in ground water samples from wells MW-8, MW-9 and MW-14 and at concentrations as high as 2,900 µg/1 (MW-8) One or more BTEX compounds were detected in the same samples at concentrations as high as 7 5 gg/l benzene(MW-14),3 2 g.g/1 toluene(MW-14), 110 gg/l ethylbenzene(MW-8)and . 240 gg/l total xylenes (MW-8) Advanced GeoEnvironmental,Inc.