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' 29 October 2004 AGE-NC Project No 01-0877 Page 3 of 4 in water samples collected from all wells, the maximum concentrations were 39,000 µg/1 benzene (MW-3), 61,000 µg/1 toluene (MW-3), 4,400 µg/1 ethylbenzene (MW-1), and 24,200 µg/1 xylenes (MW-1) ' 1,2-DCA was detected in all four wells, at a maximum concentration of 130 µg/l (MW-3) and EDB was detected in the ground water samples collected from wells MW-1 through MW-3 at a maximum ' concentration of 72 µg/1 (MW-1) TAME was detected for the first time in wells MW-1 through MW-3 at a maximum concentration of 53 µg/l (MW-2) No other target analytes were detected at or above laboratory reporting limits in the ground water samples analyzed ' Concentration maps depicting the approximate distribution of dissolved TPH-g and benzene are presented in Figures 4 and 5,respectively The analytical results of ground water samples collected ' on 23 July 2004 are summarized in Table 2 The laboratory report (CTEL Project No CT214- 0407175),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 • During the July 2004 monitoring event, the average ground water elevation at the site was 17 29 feet below MSL Ground water was inferred to flow in a northeast-plunging ridge,with water north of the ridge flowing to the north under a gradient of approximately 0 006 foot/foot and water to the south of the ridge flowing eastward under a gradient of ' approximately 0 004 foot/foot • High concentrations of TPH-g and BTEX compounds were detected in all monitoring wells ' during the third quarter 2004, in addition, 1,2-DCA was detected in all four wells at a maximum concentration of 130 µg/1 (MW-3), and EDB was detected in the ground water samples collected from wells MW-1 through MW-3 at a maximum concentration of 72 µg/1 ' (MW-1) • TAME was detected for the first time at a maximum concentration of 53 µg/l (MW-2) • The highest concentrations of contaminants were detected near the area of wells MW-1 and ' MW-3 These locations correspond to the location of the former UST#3,one of the possible mayor release point(s) of the UST system rAdvanced GeoEnvironmental,Inc I I