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F <br /> 07 January 2002 <br /> AGE-NC Project No 95-0109 <br /> Page 3 of 4 _ <br /> 4 , <br /> The ground water flow direction was Inferred to be towards the west-southwest to southwest on-site <br /> and toward the south-southwest to south, south of the site Figure 3 illustrates the contoured ground <br /> water elevations Historical ground water flow directions are summarized on Table 4 <br /> 3 2 PETROLEUM HYDROCARBON-IMPACTED GROUND WATER <br /> Petroleum hydrocarbons were detected in ground water samples from wells MW-8, MW-9 and <br /> MW-14 TPH-g was detected at concentrations as high as 12,000 micrograms per liter (µg11) <br /> I (MW-14) One or more BTEX compounds were detected in samples from the same wells at <br /> concentrations as high as 1,000 µg11 benzene, 160 µg/1 toluene,250 µg11 ethylbenzene and 420 µg/1 <br /> total xylenes (MW-14) <br /> 1,2-DCA was detected in samples collected from wells MW-7, MW-8, MW-9 and MW-14 at <br /> concentrations as high as 120 µg11 (MW-14) Other fuel additives were not detected in the samples <br />' collected The analytical results for the December 2001 monitoring event are presented on Table 2 <br /> Historical analytical results are summarized on Table 3 The approximate extent of dissolved TPH-g, <br /> benzene and 1,2-DCA are depicted on Figures 4, 5 and 6 <br /> The laboratory report {r CTEL Laboratory ID Nos 0112-033-01 through 0112-033-05) and <br /> chain-of-custody forms are included in Appendix B <br /> 4.0. DISCUSSION AND CONCLUSIONS <br /> 4 <br /> Based upon data collected from the site, AGE finds <br />' • Ground water elevation Increased an average of 0 55 feet between the September 2001 and <br /> December 2001 sampling events The ground water flow direction was inferred to be towards <br /> the west-southwest to southwest on-site and toward the south-southwest to south, south of <br /> the site <br /> • Hydrocarbon concentrations in ground water remained relatively stable in the samples <br />' collected from wells MW-8, MW-9 and MW-14 and remained below laboratory detection <br /> limits in samples collected from MW-7 and MW-12 compared to results of the June 2001 <br />' sampling event <br /> • 1,2 DCA was detected in water samples from wells MW-7, MW-8, MW-9 and MW-14 <br /> during the fourth quarter 2001 at concentrations as high as 120µg/l(MW-14) 1,2-DCA was <br />' not detected in the water sample,collected from MW-12 this quarter Other fuel additives <br /> . were not detected at the site <br /> 1 r <br /> Advanced GeoEnvironmental,Inc <br /> 1 , <br />