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15 November 2005 <br /> AGE-NC Project No 01-0877 <br />' Page 3 of 4 <br />' at lesser concentrations than the TPH-g values, ranging from 22,000 µg/1 in sample MW-4 to <br /> 110,000 µg/1 in sample MW-2 <br /> BTEX compounds were detected in water samples collected from all wells, the maximum <br /> concentrations were 77,000 gg/1 benzene (MW-3), 74,000 µg/1 toluene (MW-3), 5,000 µg/1 <br /> ethylbenzene (MW-1), and 24,200 gg/l total xylenes (MW-1) <br />' 1,2-DCA was detected in the water samples collected from all wells at a maximum concentration <br /> of 330 gg/1 (MW-1) No other target analytes were detected at or above laboratory reporting limits <br /> in the ground water samples analyzed <br /> Concentration maps depicting the approximate distribution of dissolved TPH-g and benzene are <br />' presented in Figures 4 and 5, respectively The analytical results of ground water samples collected <br /> on 22 July 2005 are summarized in Table 2 The laboratory report (CTEL Project No CT214- <br /> 0507143),quality assurance/quality control(QA/QC)report,and chain of custody forms are included <br />' in Appendix C Documents confirming the upload of laboratory electronic deliverable format(EDF) <br /> files and depth to water measurements to GeoTracker are Included in Appendix D <br /> • 4.0. SUMMARY AND CONCLUSIONS <br />' The following conclusions were drawn from the results of this investigation <br /> • During the July 2005 monitoring event, the average ground water elevation at the site was <br /> 15 92 feet below MSL The ground water flow was inferred to be toward the northeast under <br /> a gradient of approximately 0 003 foot/foot (Figure 3) <br />' 0 High concentrations of TPH-g and BTEX compounds were detected in all water samples <br /> collected during the third quarter 2005 with a maximum concentration of TPH-g at <br />' 470,000 µg/l (MW-3) and benzene at 77,000 gg/l (MW-3) 1,2-DCA was detected in the <br /> water samples collected from all wells at a maximum concentration of 330 gg/l (MW-1) <br /> • The fuel additives MTBE, EDB, TAME, TBA, DIPE and ETBE were not detected this <br /> quarter in any of the ground water samples <br /> • The highest concentrations of contaminants were detected near the area of wells MW-1 and <br /> MW-3 These locations correspond to the location of the former UST#3,one of the possible <br /> mayor release point(s) of the UST system <br /> Advanced GeoEnvironmentai,Inc <br /> I <br />