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I <br /> 4 I <br /> 15 July 2003 <br /> AGE-NC Prol ect No 95-0109 <br /> Page 3 of 5 <br /> MW-19 Data from wells MW-1 through MW-5 were not used to infer ground water flog direction <br /> or gradient because these wells are screened at different intervals than the remaining wells <br /> The ground water appears to be flowing toward the northwest and southeast away from a ground <br /> water mound located along the western boundary of the site The ground water gradient ranged <br /> between 0 003 ft/ft south of the site to 0 005 ft/ft on-site Figure 3 illustrates the contoured ground <br /> water elevations, historical ground water flow directions are summarized on Table 4 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in ground water samples from wells MW-8, MW-9 and MW-14 at r <br /> concentrations ranging from 460 micrograms per liter(µg/1)In MW-14 to 4,200 µg/l(MW-9) One <br /> or more BTEX compounds were detected in the same samples at concentrations as high as 18 µg/1 <br /> benzene (MW-14), 2 0 µg/1 toluene (MW-14), 130 µg/1 ethylbenzene (MW-9) and 150 µg/l total <br /> xylenes (MW-8) <br /> TBA was detected in the water samples collected from wells MW-8, MW-9 and MW-14 at <br />' concentrations of 7 9 µg/1, 27 µg/l and 20 µg/1, respectively 1,2-DCA was detected in samples <br /> collected from wells MW-7, MW-8, MW-9, MW-14 and MW-16 at concentrations ranging from <br />' 2 5 µg/1 (MW-8) to 65 µg/1 (MW-9) MTBE was detected at a concentration of 0 53 µg/1 in the <br /> sample collected from MW-15, which is just above the laboratory reporting limit <br />' The analytical results for the June 2003 monitoring event are presented on Table 2 Historical <br /> analytical results are summarized on Table 3 The approximate extent of dissolved TPH-g,benzene <br /> and 1,2-DCA are depicted on Figures 4, 5 and 6 The laboratory reports (MAI Laboratory I D Nos <br /> 0307002-001 through 0307002-010) and chain-of-custody forms are included in Appendix B <br /> I <br /> I w <br />' 4.0. DISCUSSION AND CONCLUSIONS <br /> Based upon data collected from the site, AGE finds <br /> 1 <br /> • The ground water appears to be flowing toward the northwest and southeast away from a <br /> groundwater mound located along the western boundary of the site The ground water <br />' gradient ranged between 0 003 ft/ft south of the site to 0 005 ft/ft on-site <br /> • TPH-g was detected in groundwater samples from wells MW-8,MW-9 and MW-14 and at <br />' concentrations as high as 4,200 µg/1 (MW-9) <br /> 1 ' <br /> Advanced GeoEnvironmental,Inc <br /> i <br /> 1 <br /> i <br />