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' 13 January 2006 • AGE-NC Project No 98-0497 Page 3 of 4 ' • TPH-g was detected in well MW-1 at a concentration of 5,000 micrograms per liter(µg/1) The laboratory report noted that the detected concentration was mostly in the diesel range - • TPH-d was detected in well MW-1 at a concentration of 48,000 µg/l • BTEX compounds were not detected in the five ground water samples analyzed • MTBE was not detected in the five ground water samples analyzed 1 / Laboratory results of the submitted water samples are summarized in Table 2 The Inferred areal ' extent of hydrocarbon-impacted ground water is Illustrated on Figure 4 Copies of the laboratory report(CTEL Project No CT214-0509134),quality assurance/quality control(QA/QC)reports,and chain of custody form are provided in Appendix B GeoTracker confirmation pages of the submitted ' laboratory electronic deliverable format(EDF) files are included in Appendix C ' 4.0. SUMMARY AND CONCLUSIONS The findings of the September 2005 ground water monitoring event include the following ' • Ground water elevations at the site averaged approximately 43 28 feet below MSL g Pp Y ' indicating an average decrease of 2 86 feet since the last monitoring event in June 2005 • The ground water was inferred to be flowing toward the northeast at an approximate hydraulic gradient of 0 008 ft/ft ' • TPH-g and TPH-d were detected in well MW-1 at concentrations of 5,000 µg/1 and 48,000 µg/l, respectively, however, the reported TPH-g concentrations were mostly in the diesel range r • Comparing the ground water sample results from this quarter and the previous quarter, TPH-d concentrations have decreased in well MW-1 (from 440,000 µg/l to 48,000 µg/1)and ' remained non detect in samples from wells MW-2 through MW-5 • The hydrocarbon-impacted ground water plume appears to be limited to the former UST area ' immediately surrounding well MW-I 5.0. RECOMMENDATIONS Based on the results of this and previous investigations, AGE recommends the continuation of quarterly monitoring and sampling of the ground water well network The fourth quarter monitoring ,. event was performed on 07 December 2005 ' Advanced GeoEnvironmental,Inc 1