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111 <br /> . 20 October 2004 <br /> AGE-NC Project No 95-0109 <br /> Page 4of5 <br /> 1,2-DCA was detected in samples collected from wells MW-11, MW-14 and MW-16 at <br /> concentrations ranging from 2 1 gg/l (MW-11) to 7 1 gg/l (MW-14) TBA was detected in the <br /> sample collected from well MW-14 at a concentration of 7 2 gg/l No additional analytes were <br /> detected above laboratory limits in the ground water samples collected <br /> The analytical results from the September 2004 monitoring event are presented in Table 2 Analytical <br /> results to date are summarized in Table 3 The approximate extent of dissolved TPH-g,benzene and <br /> 1,2-DCA are depicted on Figures 4, 5 and 6 The laboratory report(MAI Work Order 0409135)and <br /> chain of custody forms are included in Appendix B <br /> 4.0. DISCUSSION AND CONCLUSIONS <br /> Based upon data collected from the site, AGE finds <br /> • Ground water on-site was inferred to be flowing towards the south The ground water <br /> gradient ranged from 0 002 ft/ft on-site to 0 005 ft/ft off-site <br /> • TPH-g was detected in ground water samples from wells MW-8 and MW-9 at concentrations <br /> as high as 2,600 gg/l (MW-8) <br /> • BTEX compounds were detected in the samples from wells MW-8 and MW-9 at <br /> concentrations as high as 1 5 gg/l benzene (MW-8), 4 0 gg/1 toluene (MW-8), 57 gg/1 <br /> ethylbenzene (MW-9) and 240 gg/1 total xylenes (MW-8) <br /> • TPH-g and BTEX compounds were not detected in any of the newly installed monitoring <br /> wells (MW-20, MW-21 and MW-22) The lateral and vertical extent of petroleum <br /> hydrocarbon-impacted ground water has been defined <br /> • 1,2-DCA was detected in samples collected from wells MW-11, MW-14 and MW-16 at <br /> concentrations ranging from 2 1 gg/l (MW-11) to 7 1 µg/1 (MW-14) 1,2-DCA was not <br /> detected in any of the newly installed ground water monitoring wells nor the newer deeply- <br /> screened wells The lateral and vertical extent of the 1,2-DCA contamination appears to be <br /> defined <br /> • TBA was detected in the sample collected from well MW-14 at a concentration of 7 2 µg/1 <br /> No additional analytes were detected above laboratory limits in the ground water samples <br /> collected <br /> Advanced GeoEnvironmental,Inc <br />