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i 06 September 2005 AGE-NC Project No 01-0877 Page 3 of 4 I (µg11)in sample MW-4 to 500,000 µg/1 in sample MW-3 BTEX compounds were detected in water `samples collected from all wells,the maximum concentrations were 140,000 µg/1 benzene(MW-3), 86,000 µg/1 toluene (MW-1 and MW-3), 11,000 µg/1 ethylbenzene(MW-1),and 124,000 µg/1 total xylenes (MW-1) ' 1,2-DCA was detected in the water samples collected from all wells at a maximum concentration of 1,100 µg/1(MW-3)and EDB was detected in the all water samples collected from MW-1 through MW-3 with a maximum concentration of 80 µg/1(MW-3) TAME was detected in the water samples collected from MW-1 through MW-3 with a maximum concentration of 740 µg/l(MW-1) 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 26 April 2005 are summarized in Table 2 The laboratory report (CTEL Project No CT214- 0504253),quality assurance/quality control(QA/QC)report,and chain of custody forms 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 April 2005 monitoring event,the average ground water elevation at the site was 16 15 feet below MSL The ground water table formed a shallow west-trending plunging- ridge,with ground water flow toward the northwest under a gradient of approximately 0 014 foot/foot and to the southwest under a weaker gradient of approximately 0 008 foot/foot (Figure 3) • High concentrations of TPH-g and BTEX compounds were detected in all water samples collected during the second quarter 2005 with a maximum concentration of TPH-g at ' 500,000 µg/l (MW-3) and benzene at 140,000 µg/1 (MW-3) 1,2-DCA was detected in the water samples collected from all wells at a maximum concentration of 1,100 µg/1 (MW-3) and EDB was detected in the all water samples collected from MW-1 through MW-3 with ' a maximum concentration of 80 pg/l'(MW-3) TAME was detected In the water samples collected from MW-1 through MW-3 with a maximum concentration of 740 µg/l (MW-1) • The fuel additives MTBE,TBA,DIPE and ETBE were not detected this quarter in any of the ground water samples Advanced Geo Environmental,Inc