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M J f r ' 23 May 2006 AGE-NC-99-0570 ' Page 3 of 4 event, the top of the ground water table occurred within the screened intervals of the wells I Ground water at the site was Inferred to be flowing north-northwest under a significant hydraulic gradient of approximately 0 023 foot/foot(ft/ft) The ground water elevation contours are depicted on Figure 3 ' 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES t ' TPH-g was detected in the ground water samples collected from wells MW-1 and MW-2 at concentrations of 2,600 micrograms per liter(µg/1) and 900 µg/1, respectively ' BTEX compounds were detected in well MW-1 at concentrations of 6 0 µg/1 benzene, 57 µg/1 ethylbenzene,and 66µg/l xylenes Toluene was not detected this quarter from the samples collected MTBE was detected in well MW-1 at a concentration of 19 µg/l ' No other target analytes were detected at or above laboratory reporting limits in any of the samples analyzed Laboratory results of ground water samples are summarized In Table 2 The laboratory ' • ' reports(CTEL Project No CT214-0602042),quality assurance/quality control(QA/QC)reports,and chain of custody forms are included in Appendix C Documents confirming the upload of laboratory electronic deliverable format (EDF) files and depth to water measurements to GeoTracker are ' Included in Appendix D ' 4.0.- SUMMARY AND CONCLUSIONS ' Based on the results of the February 2006 monitoring event,AGE draws the following conclusions • During the February 2006 ground water monitoring event,the relative ground water elevation ' ranged from 6 82 feet below MSL to 9 65 feet below MSL The average ground water elevation was 8 10 feet below MSL, indicating an increase of approximately 147 feet compared to the November 2005 monitoring event • Ground water at the site was Inferred to be flowing north-northwest under a significant r hydraulic gradient of approximately 0 023 ft/ft This flow direction and gradient is similar to previous monitoring events • TPH-g was detected in the ground water samples collected from wells MW-1 and MW-2 at concentrations of 2,600 µg/l and 900 µg11, respectively TPH-d was not detected in any of the samples analyzed • BTEX compounds were detected in well MW-1 at concentrations of 6 0 µg/1 benzene, Advanced GeoEnvironmentai,Inc