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05 March 2004 AGE-NC Project No 99-0559 Page 9 of 11 14U5 - Upper ' TPH-g was detected in samples MW-7C at a concentration of 8,300 µg/1 BTEX compounds were detected in all samples MW-6C and MW-7C at maximum concentrations of 720 µg/1 benzene, 910µg/1 toluene,42µg/1 ethylbenzene and 221 µg/1 xylenes MTBE was detected in samples MW-6C and MW-7C at concentrations of 4 7 µg/1 and 160 µg/1, respectively HU5 -Lower TPH-g was detected in samples MW-7D at a concentration of 400 µg/1 BTEX compounds were detected in samples MW-6D and MW-7D at maximum concentrations of 93 µg/1, 47 µg11, 6 5 gg/1 ' and 17 9 µg/l, respectively MTBE was only detected in sample MW-7D at a concentration of 21 µg/1 iHU6 TPH-g was detected at a concentration 940µg/1 in sample MW-7E BTEX compounds were detected in samples MW-6E and MW-7E at maximum concentrations of 240 µ,g11, 350 µg/1, 25 µg/1 and 109µg/1,respectively,in sample MW-7E MTBE was detected in samples MW-7E at a concentration ' of 41 µg/1 ' The analytical results of current as well as historical ground water samples are summarized in Table 2 Iso-concentration maps for September 2003 displaying the estimated distribution ofdzssolved benzene ' and MTBE in each hydrologic units are depicted in Figures 13 through 17 The laboratory reports (CTEL I D nos CT214-0305172 and CT214-0310003), quality assurance and quality control (QA/QC) reports and chain-of-custody farms are included in Appendix B 4.0. SUMMARY AND CONCLUSIONS Based on data collected during the monitoring event, AGE concludes • The general ground water flow direction for HUl/HU2 was towards the east during the second quarter and south during the third quarter,while the ground water flow direction was west to north-northwest in the other flow units 0 Free petroleum product was detected in wells surrounding the former UST area Advanced GeoEnvironmental, Inc