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r� ' 15 April 2003 i AGE-NC Project No 95-0109 ' Page 3 of 5 screened Intervals of water-table wells MW-1 through MW-14 and MW-16,but ranged from 20 to 60 feet above the screened Intervals of the deep-screened wells MW-15 and MW-17 through MW-19 ' The ground water appears to flow radially outward between southwest at the western edge of the site r and south at the central portion of the site and off-site The ground water gradient ranged between ' 0 004 ft/ft at the western edge of the site to 0 005 ft/ft off-site Figure 3 Illustrates the contoured ground water elevations, historical ground water flow directions are summarized on Table 4 32 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 440 micrograms per liter(gg/1) in MW-14 to 1,500 µg/l(MW-8) One or more BTEX compounds were detected In the same samples at concentrations as high as 21 µg/1 ' benzene (MW-14), 8 5 µg/1 toluene (MW-14), 44 µg/1 ethylbenzene (MW-8) and 68 µg/1 total xylenes (MW-8) ' • TBA and 1,2-DCA were the only fuel additives detected in the analyzed samples TBA was detected in the water samples collected from wells MW-8 and MW-9 at concentrations of 6 1 µg/1 and 11 µg/l,respectively 1,2-DCA was detected in samples collected from wells MW-7,MW-8,MW-9, MW-14 and MW-16 at concentrations ranging from 0 55 µg/l (MW-7) to 69 µg/l (MW-14) 1 The analytical results for the March 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 Laboratory I D Nos 0303427-001 through 0303427-010) and chain-of-custody forms are Included in Appendix B F ' 4.0. ' DISCUSSION AND CONCLUSIONS Based upon data collected from the site, AGE finds ' • Ground water elevation increased an average of 0 97 feet between the December 2002 and March 2003 sampling events The,ground water flow direction was inferred to be radially ' outward towards the south and southwest on-site and toward the south-southeast south of the site r • TPH-g was detected in ground water samples from wells MW-8, MW-9 and MW-14 and at concentrations as high as 1,500 µg/1 (MW-8) Advanced GeoEnvironmental,Inc