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' 13 January 2006 <br /> • AGE-NC Project No 98-0497 <br /> ' Page 3 of 4 <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> The analytical results from the December 2005 ground water monitoring event are as follows <br /> • TPH-g was detected in well MW-1 at a concentration of 9,300 micrograms per liter(pg/l) <br /> The laboratory report noted that the detected concentration was mostly in the diesel range <br /> ' • TPH-d was detected in well MW-1 at a concentration of 44,000 µg/l <br /> • BTEX compounds were not detected in the four ground water samples analyzed <br /> • MTBE was not detected in the four ground water samples analyzed <br /> ' Laboratory results of the submitted water samples are summarized in Table 2 The inferred areal <br /> extent of hydrocarbon-impacted ground water is illustrated on Figure 4 Copies of the laboratory <br /> report(CTEL Project No CT214-0512062),quality assurance/quality control(QA/QC)reports,and <br /> chain of custody form are provided in Appendix B GeoTracker confirmation pages of the submitted <br /> laboratory electronic deliverable format (EDF) files are included in Appendix C <br /> • 4.0. SUMMARY AND CONCLUSIONS <br /> ' The findings of the December 2005 ground water monitoring event include the following <br /> ' • Ground water elevations at the site averaged approximately 43 93 feet below MSL, <br /> indicating an average decrease of 0 65 feet since the last monitoring event in September <br /> 2005 <br />' • The ground water was inferred to be flowing toward the northeast at an approximate <br /> hydraulic gradient of 0 0008 ft/ft <br /> • TPH-g and TPH-d were detected in well MW-1 at concentrations of 9,300 pg/l and <br /> 44,000 µg11, respectively, however, the reported TPH-g concentrations were mostly in the <br /> diesel range <br />' • Comparing the ground water sample results from this quarter and the previous quarter, <br /> TPH-d concentrations have decreased in well MWA (from 48,000 µg/1 to 44,000 pg/l)and <br />' r remained non detect in samples from wells MW-3 through MW-5 - <br /> • The hydrocarbon-impacted ground water plume appears to be limited to the former UST area <br /> immediately surrounding well MW-1 <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br />