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C� ql . 15 May 2002 AGE-NC Project No 95-0109 Page 3 of 5 The ground water flow direction was Inferred to be towards the southwest on-site and toward the south,south of the site Figure 3 Illustrates the contoured ground water elevations Historical ground water flow directions are summarized on Table 4 3 2 PETROLEUM HYDROCARBON-IMPACTED GROUND WATER Petroleum hydrocarbons were detected in ground water samples from wells MW-1,MW-4,MW-5, MW-8,MW-9 and MW-14 TPH-g was detected at concentrations as high as 5,100 micrograms per liter(µg11)(MW-14) One or more BTEX compounds were detected in samples from the same wells at concentrations as high as 1,000 gg/l benzene, 57 µg11 toluene, 72 gg/l ethylbenzene and 300 gg/l total xylenes (MW-14) 1,2-DCA was detected in samples collected from wells MW-1, MW-3, MW-4, MW-5, MW-8 and MW-9 at concentrations as high as 44�Lg/1(MW-5) TBA was detected in the water sample collected from MW-1 at a concentration of 5 0 gg/l Other fuel additives were not detected in the samples collected Nine additional analytes were detected by EPA Method 8260 Carbon disulfide was • detected in the water sample collected from MW-1, 1,2,4 tnmethylbenzene was detected in the water samples collected from MW-4,MW-8,MW-9 and MW-14, 1,3,5 tnmethylbenzene was detected in the water samples collected from MW-5, MW-8 and MW-9, naphthalene was detected in the samples collected from wells MW-8 and MW-9, and sec-butyl benzene, isopropyl benzene, p-isopropyl toluene, methyl ethyl ketone, and n-propyl benzene were detected in the ground water samples collected from well MW-9 The analytical results for the March 2002 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 Graphs illustrating the concentrations of TPH-g, benzene and 1,2-DCA over time are presented in Appendix C The laboratory report (MAI Laboratory I D Nos 0203321-OOIA through 0203321-015A) 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 elevation increased an average of 0 93 feet between the December 2001 and March 2002 sampling events The ground water flow direction was inferred to be towards the southwest on-site and toward the south, south of the site Advanced CeoEnvironmental,Inc