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' 28 December 2004 i AGE-NC Project No 01-0839 ' Page 3 of 4 ' The fuel additive 1,2-DCA was detected in the water samples collected from wells MW-3 and MW-4 at concentrations of 12 µg/1 and 3 3 µg/1, respectively ' TAME was detected in the water sample collected from well MW-3 at a concentration of 3 6 99/1 No other analytes were detected at or above laboratory detection limits in the ground water samples ' analyzed The laboratory analytical results are summarized in Table 2 The laboratory report(CTEL Project No CT214-0409006), quality assurance/quality control (QA/QC) report, and chain of custody form 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 ' The following conclusions were drawn from the results of this investigation • Ground water elevations at the site ranged from 40 77 feet to 41 01 feet below MSL, ' . indicating a decrease in ground water elevation from the previous quarter The inferred ground water flow direction was northwest at a gradient of approximately 0 004 f1/ft I0 TPH-g was detected in wells MW-3 and MW-4 • MTBE and 1,2-DCA were detected for the fifth consecutive quarter ' 0 BTEX compounds were not detected in any of the ground water samples analyzed, indicating, the detections of TPH-g are sole and isolated peaks on the sample chromatography correlating only to MTBE ' 5.0. RECOMMENDATIONS Based on the findings of this investigation, AGE recommends • Continuation of the quarterly ground water monitoring program • Preparation of a work plan to characterize the extent of soil contamination beneath the existing/former UST location • Preparation of a work plan to characterize the extent of ground water contamination down ' gradient of the existing/former UST location and MW-4 • Advanced GeoEnvironmental,Inc I