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1 <br />' 05 October 2006 <br /> • AGE-NC-99-0570 <br />' Page 3 of 4 <br /> Ground water at the site was Inferred to be flowing north-northwest under a significant hydraulic <br /> rgradient of approximately 0 026 foot/foot(ft/ft) The ground water elevation contours are depicted <br /> on Figure 3 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br />' TPH-g was detected in the ground water samples collected from wells MW-1, MW-2 and MW-5 at <br /> concentrations of 2,400 micrograms per liter(µg11), 2,000 µg11 and 2,200 µg/l, respectively <br /> 1 <br />' BTEX compounds were detected in wells MW-1, MW-2 and MW-5 at concentrations as high as 12 <br /> µg/l benzene(MW-5), 10µg/1 toluene(MW-2),26µg/l ethylbenzene(MW-5),and 426 µg11 xylenes <br /> (MW-1) MTBE was not detected in well MW-1 this quarter <br /> No other target analytes were detected at or above laboratory reporting limits in any of the samples <br />' analyzed Laboratory results of ground water samples are summarized in Table 2 The laboratory <br /> reports(CTEL ProjectNo CT214-0605063),quality assurance/quality control(QA/QC)reports,and <br /> chain of custody forms are included in Appendix C Documents confirming the upload of laboratory <br /> • electronic deliverable format (EDF) files and depth to water measurements to GeoTracker are <br /> included in Appendix D <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> iBased on the results of the May 2006 monitoring event, AGE draws the following conclusions <br />' During the May 2006 ground water monitoring event, the relative ground water elevation <br /> ranged from 2 92 feet below MSL to 5 82 feet below MSL The average ground water <br /> elevation was 4 24 feet below MSL, indicating an increase of approximately 3 86 feet <br /> compared to the February 2006 monitoring event <br />' 0 Ground water at the site was inferred to be flowing north-northwest under a significant <br /> hydraulic gradient of approximately 0 026 ft/ft This flow direction and gradient is similar <br />' to previous monitoring events <br /> • TPH-g was detected in the ground water samples collected from wells MWA, MW-2 and <br />' MW-5 at concentrations of 2,400µg/1, 2,000 µg/1 and 2,200 µg/l, respectively TPH-d was <br /> not detected in any of the samples analyzed <br /> • BTEX compounds were detected in wells MW-1, MW-2 and MW-5 at concentrations as <br />' high as 12 µg/1 benzene (MW-5), 10 µg/1 toluene (MW-2), 26 µg/1 ethylbenzene (MW-5), <br /> • and 426 µg/1 xylenes (MW-1) MTBE was not detected in well MW-1 this quarter <br />' Advanced GeoEnvironmentai,Inc <br />