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i <br />' 07 August 2001 <br /> AGE-NC Project No 98-0511 <br />' Page 3 of 4 <br /> 240 µg/1 ethylbenzene and 1,300 µg/I total xylenes, BTEX compounds were detected in MW-5 at <br /> concentrations of 140 µg/1, 7 8 µg11, 53 µg/1 and 20 µg/1, respectively Toluene and total xylenes <br /> were detected in the sample from MW-8 at concentrations of 3 9 µg/1 and 1 5 µg/l, respectively <br /> MTBE was detected in the ground water samples collected from MW-1, MW-3 and MW-5 at <br /> concentrations of 10µg/1,9 0µg/1 and 200µg/1 respectively TBA was detected in the ground water <br /> sample collected from MW-5 at a concentration of 15 µg/1 No other fuel oxygenated compounds <br /> were detected at concentrations above laboratory reporting limits <br /> Analytical results of ground water samples are summarized on Table 2 Copies of the laboratory <br /> report (MAI Laboratory ID 71357-71364) and chain-of-custody forms are in Appendix B <br /> I <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> iBased upon data collected from the site, AGE concludes the following <br /> lie <br /> • The ground water gradient was calculated to range from less than 0 002 ft/ft to 0 006 ft/ft, <br /> the ground water flow direction appears to be generally northwestward, varying from nearly <br /> west to north-northeast <br />' e Samples from MW-2,MW-4, MW-6 and MW-7 had less than detectable concentrations of <br /> all analytes <br /> • There were no significant variations of concentrations of any detected analytes in samples <br /> from MW-1, however, TPH-g and benzene concentrations increased by a factor of ten and <br /> MTBE concentration doubled in the water sample from MW-5 <br />' • The plume of impacted ground water is delineated toward the south, west, southeast, and <br /> north, but is not constrained toward the northwest or east to northeast <br /> I <br /> 5.0. RECOMMENDATIONS <br /> I Based upon data collected from the site AGE recommends continued ground water monitoring at <br /> p � 1�' g <br />' the site AGE recently submitted a work plan to advance five additional soil borings to help define <br /> the vertical as well as the northwestern and eastern lateral extent of the contaminated ground water <br /> plume The work plan has been approved by the PHS-EHD and the project is anticipated to occur <br /> by the third quarter of 2001 <br /> Advanced GeoEnnronmental,inc <br />