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. 13 July 2004 _ AGE-NC Project No 00-0769 Page 6 of 7 TPH-g was detected at in the samples collected from MW-4E and MW-5E at concentrations of ' 1,900 µg/1 and 690 µg/1, respectively = ' BTEX compounds were detected at concentrations as high as 150 µg/1 benzene,_170 µg/1 toluene, 32 µg/1 ethylbenzene and 157 µg/l total xylenes The highest concentrations were detected in the sample from MW-4E ' 1 The fuel additive 1,2 DCA was detected at a concentration of 6 6 µg/1 in the sample collected from well MW-4E No other constituents of concern were detected above laboratory reporting` limits in the water samples collected during the first quarter sampling event Analytical results of ground water ' monitoring well samples are summarized in Tables 2 through 5 The laboratory reports (CTEL Laboratory IDs 0403-001-1 through 0403-001-31) and chain-of-custody forms are presented in Appendix D 4.0. SUMMARY AND CONCLUSIONS • Based on data collected during the February2004 ground water monitoring and sampling event IAGE concludes Depth to ground water on at the site varied between 25 92 feet and 30 12 feet (BTOC), ground water elevations at the site ranged between 15 34 feet to 19 11 feet below MSL during the February 2004 monitoring event f o • HU-1 generally flowed east at 0 003 ft/ft, HU-2 generally flowed southeast at 0 002 ft/ft, ' HU-3 generally flowed east at 0 001 ft/ft, HU-4 flowed generally toward the north at a gradient of approximately 0007 ft/ft (Figures 3 through 6) 4 ' The well head survey conducted in April 2004 appears to have corrected the ground water elevation errors observed during previous monitoring events The most highly impacted ground water appears to be near the location of the former USTs, ' Figures 7 through 11 Illustrate the lateral extent of hydrocarbon-impacted ground water, as depicted within each modeled hydrogeologic unit Vertically;hydrocarbon-impacted ground I water was detected in each of the screened Intervals of multi-level wells MW-4 through ' MW-7 Analytes of concern were not detected at or above laboratory reporting limits In up- gradient multi-level well MW-9 and,cross-gradient multi-level well MW-8 ' 1,2-DCA and BTEX compounds were present above the DHS's Maximum Contaminant . Levels (MCLs) in all levels of the multi-level well MW-4 No MTBE was detected in any samples from this monitoring event Advanced GeoEnvironmental,Inc