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20 February 2006 <br /> • AGE-NC-99-0570 <br /> Page 3 of 4 <br />' monitoring event, the top of the ground water table occurred within the screened intervals of the <br /> wells <br />' Ground water at the site was inferred to be flowing north-northwest under a significant hydraulic <br /> gradient of approximately 0 02 foO/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 and MW-2 at <br /> concentrations of 4,400 micrograms per liter(µg/1) and 1,900 µg/l, respectively <br />' BTEX compounds were detected in wells MW-1 and MW-2 at maximum concentrations of <br /> 5 6 µg/l <br /> benzene (MW-1), 5 3 µg/l toluene (MW-1), 45 µg/l ethylbenzene (MW-2), and 9 7 µg/1 xylenes <br />' (MW-1) MTBE was detected in well MW-1 at a concentration of 22 µg/l r <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 Project No CT214-0511053),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 /> 1 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the results ofthe November 2005 monitoring event,AGE draws the following conclusions <br />' During the November 2005 ground water monitoring event, the relative ground water <br /> elevation ranged from 8 36 feet below MSL to 11 13 feet below MSL The average ground <br /> water elevation was 9 57 feet blow MSL, indicating a decrease of approximately 0 91 feet <br />' compared to the July 2005 monitoring event <br /> * Ground water at the site was inferred to be flowing north-northwest under a significant <br /> hydraulic gradient of approximately 0 02This flow direction and gradient is similar <br /> to previous monitoring events <br /> Ow <br /> • TPH-g was detected in the ground water samples collected from wells MW-1 and MW-2 at <br /> concentrations of 4,400 µg/1 and 1,900 µg/l, respectively Since TPH-g was not detected in <br /> well MW-5 during the November 2005 ground water monitoring event, the detection of <br /> ,i TPH-g in the well in July 2005 was probably due to error in the sampling or analyzing <br /> Advanced GeoEnvironmental,Inc <br />