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4 ` 14 October 2004 i AGE-NC Project No 01-0839 ' Page 3 of 4 The fuel additive 1,2-DCA was detected in the water sample collected from well MW-4 at a concentration of 4 1 µg11 TAME was detected in the water sample collected from well MW-3 at a concentration of 4 7 µg/l No other analytes were detected at or above laboratory detection limits in the ground water samples analyzed The laboratory analytical results are summarized on Table 2 The laboratory report(CTEL Project No CT214-0405116), 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 35 04 feet to 35 51 feet below MSL, 10 indicating a decrease in ground water elevation from the previous quarter The inferred ground water flow direction was south to southwest at a gradient of approximately 0 01 ft/ft and due west at a gradient of approximately 0 003 ft/ft • TPH-g was detected in wells MW-3 and MW-4 • MTBE and 1,2-DCA were detected for the fourth consecutive quarter • 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 I • Preparation of a work plan to characterize the extent of soil contamination beneath the existing/former UST location Ia 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