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' 18 July 2005 AGE-NC Project No 97-0326 Page 4of5 ' HU2 -TPH-g and BTEX compounds were detected in samples MW-813 and MW-9B, at maximum concentrations of 5,600 gg/l TPH-g (MW-8B), 3,800 µg11 benzene, (MW-913), 850 µg/1 toluene (MW-9B), 530 µg/1 ethylbenzene (MW-913), and 1,580 µg/1 xylenes (MW-9B) ' The fuel additive DIPE was detected in sample MW-813 at a concentration of 6 5 µg/1 ' HU4-TPH-g and BTEX compounds were detected in samples MW-8C and MW-9C,the maximum concentrations were detected in sample MW-9C at 3,200 pg/l TPH-g, 830 pg/1 benzene, 170 µg/1 toluene, 72 pg/l ethylbenzene, and 200 pg/l xylenes HU6-TPH-g and BTEX compounds were detected in samples MW-813 and MW-913,the maximum concentrations were detected in sample MW-9D at 780 pg/1 TPH-g, 80 pg/1 benzene, 110 4g/1 ' toluene, 32 µg/1 ethylbenzene, and 127 1Ag11 xylenes No additional analytes were detected at or above the laboratory reporting limits in the samples analyzed Analytical results are summarized in Table 2 The laboratory report (CTEL Project No 214-0503165),quality assurance/quality control report,and chain of custody forms are presented in . Appendix C Documents confirming the upload of laboratory electronic deliverable format (EDF) files and depth to water measurements to GeoTracker are provided in Appendix D 4.0. SUMMARY AND CONCLUSIONS ' The following conclusions were drawn from the results of this investigation • The ground water elevations on 16 March 2005 ranged from 21 51 feet(MW-2)to 21 98 feet (MW-9D)below MSL,the flow direction of first-encountered ground water was inferred to be toward the south-southwest at gradients of between 0 004 ft/ft and 0 01 ft/ft • TPH-g and BTEX compounds were detected in ground water samples collected from all ' HUs, but the fuel additives MTBE and 1,2-DCA were detected only in HU1 Laterally, the highest concentrations of contaminants in HU1 were centered around the tank-pit and ' dispenser areas (Figures 4 and 5), vertically, TPH-g and BTEX compounds exhibited decreasing concentrations with increasing depth • The lateral extent and vertical extent of petroleum hydrocarbon-impacted ground water have ' not been defined Advanced GeoEnnronmaenhd,Inc- '