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05 November 2005 <br /> AGE-NC Project No 97-0326 <br />' Page 4of5 <br /> I HU2 - TPH-g and BTEX compounds were detected in samples MW-8B and MW-913, at maximum <br /> concentrations of 16,000 gg/l TPH-g,7,100 gg/l benzene, 750 µg/1 toluene, 270 gg/l ethylbenzene, <br /> and 1,290 µg/1 xylenes, in sample MW-9B <br /> IThe fuel additives TAME and 1,2-DCA were detected in samples MW-813 and MW-913 at maximum <br /> concentrations of 84 pg/1 and 38 gg/l, respectively, in sample MW-9B <br /> HU4-TPH-g and BTEX compounds were detected in samples MW-8C and MW-9C,the maximum <br /> concentrations were detected in sample MW-9C at 4,600 µg/l TPH-g, 2,100 µ.g/1 benzene, 73 µg/1 <br />' toluene, 34 µg/1 ethylbenzene, and 99 gg/l xylenes <br /> The fuel additive TAME was detected in sample MW-8C at 7 2 gg/l, and 1,2-DCA was detected in <br /> samples MW-8C and MW-9C at 4 1 µg/1 and 16 µg/1, respectively <br /> HU6-TPH-g and BTEX compounds were detected in samples MW-8D and MW-9D,the maximum <br /> concentrations were detected in sample MW-9D at 12,000 µg11 TPH-g. 8,100 gg/l benzene, <br /> 1,100 µg/1 toluene, 300 µg/l ethylbenzene, and 1,450 µg/1 xylenes <br /> f • The fuel additives TAME and 1,2-DCA were detected in samples MW-81)and MW-913 at maximum <br /> concentrations of 120 µg/land 71 µg/1 <br />' No additional analytes were detected at or above the laboratory reporting limits in the samples <br /> analyzed Analytical results are summarized in Table 2 The laboratory report (CTEL Project No <br />' CT214-0509186),quality assurance/quality control report,and chain of custody forms are presented <br /> in Appendix C Documents confirming the upload of laboratory electronic deliverable format(EDF) <br /> files and depth to water measurements to GeoTracker are provided in Appendix D <br /> 1 <br /> 4.4. SUMMARY AND CONCLUSIONS <br />' The following conclusions were drawn from the results of this investigation <br />' • The ground water elevations on 21 September 2005 ranged from 20 86 feet to 22 48 feet <br /> below MSL, the net flow direction of first-encountered ground water was inferred to be <br /> toward the south at a gradient of 0 005 ft/ft or less, which is consistent with the historical <br />' flow direction at this site <br /> • TPH-g and BTEX compounds were detected In ground water samples collected from all <br />' HUs, the highest concentrations were detected in HU 1 The fuel additive MTBE was <br /> detected only in HU1, whereas TAME and 1,2-DCA were detected in all HUs <br /> rAdvaneed GeoEnvironmental,Inc <br /> 1 <br />