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i <br /> 18 July 2002 <br /> AGE-NC Project No 95-0109 <br /> IPage 3 of 4 <br /> , y <br />' 0 02 ft/ft at the western edge to 0 009 ft/ft at the central portion of the site Figure 3 illustrates the <br /> contoured ground water elevations, historical ground water flow directions are summarized on <br /> Table 4 <br /> 3 2 PETROLEUM HYDROCARBON-IMPACTED GROUND WATER <br /> 1 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 5,600 micrograms per liter (µg11) <br />' (MW-14) One or more BTEX compounds were detected in samples from the same wells at <br /> concentrations as high as 630 µg/1 benzene and 54 pg/l toluene in sample MW-14 and 200 µg/1 <br /> ethylbenzene and 330 µg/1 total xylenes in sample MW-8 1 <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 43 µg/1 (MW-14) TBA was detected in the water samples collected from <br />' wells MW-8 and MW-9 at concentrations of 10 µg/l and 18 µg/l, respectively Other fuel additives <br /> were not detected in the samples collected The analytical results for the June 2002 monitoring event <br /> are presented on Table 2 Historical analytical results are summarized on Table 3 The approximate <br /> extent of dissolved TPH-g,benzene and 1,2-DCA are depicted on Figures 4, 5 and 6 The laboratory <br /> report (MAI Laboratory I D Nos 0206147-OOIA through 0206147-005A) and chain-of-custody <br /> forms are Included in Appendix B <br />' 4.0. DISCUSSION AND CONCLUSIONS <br /> Based upon data collected from the site, AGE finds <br /> 1 • Ground water elevation decreased an average of 0 90 feet between the March 2002 and <br /> June 2002 sampling events The ground water flow direction was inferred to radiate outward <br />' between a west-southwest direction at the western edge and a southerly direction at the <br /> central portion of the site <br /> 1 • 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 previous <br />' sampling event ` <br /> • 1,2-DCA was detected in samples collected from wells MW-7,MW-8, MW-9 and MW-14 <br /> at concentrations as high as 43 µg/l(MW-14) 1,2-DCA was not detected in the water sample <br />' collected from MW-12 for the third consecutive quarter <br /> n F <br />' Advanced GeoEnvironmental,Inc <br /> 1 <br /> - i <br />