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18 June 2004 <br /> AGE-NC Project No 99-0559 <br /> Page 7 of 8 <br /> HU6 <br /> TPH-g was detected at a concentration 330 gg/1 in sample MW-7E BTEX compounds were detected <br /> in samples MW-6E and MW-7E at maximum concentrations of 40 µg/1, 9 4 µg/1, 11 gg/1 and 35 <br /> Ag/l, respectively, in sample MW-7E In addition, MTBE was detected in sample MW-7E at <br /> concentration of 41 µg/1 <br /> The analytical results of current and historical ground water samples are summarized in Table 2 An <br /> iso-concentration map for the first ground level for March 2004,displaying the estimated distribution <br /> of dissolved benzene and MTBE is depicted in Figure 8 An iso-concentration cross section for the <br /> site for March 2004, displaying the estimated distribution of dissolved TPH-g,benzene and MTBE <br /> is depicted in Figure 9 The laboratory reports(CTEL I D nos CT214-0403190), quality assurance <br /> and quality control (QA/QC) reports and cham-of-custody forms are included in Appendix B <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> . Based on data collected during the monitoring event, AGE concludes <br /> • The general ground water flow direction for HU1/HU2 was towards the west-southwest <br /> during the first quarter and the ground water flow direction was calculated to be west to <br /> north-northwest in the lower flow units (HU3 to HU6) <br /> • A slight presents of free petroleum product was detected in one well within the former UST <br /> area (MW-2) <br /> • During the quarter the highest concentrations of petroleum hydrocarbons detected at the site <br /> were present in the ground water samples collected from wells screened in HUl and HU2 <br /> at the east edge of the UST area The high concentrations of petroleum hydrocarbon <br /> compounds were detected in the sample from well MW-1 <br /> • The concentrations of TPH-g appeared to decreased overall, except in the sample from well <br /> MW-1 Also the concentrations of BTEX compounds and MTBE decreased or remained <br /> essentially unchanged, except in the monitoring well near extraction which indicted an <br /> increase in BTEX compounds and MTBE concentrations <br /> • TPH-g and BTEX compounds were not detected in well MW-8 relative to the previous <br /> quarters <br /> • TAME and 1,2-DCA were detected in samples from the former UST area,and down-gradient <br /> of the UST area (MW-4) <br /> Advanced GeoEnvironmental,Inc <br />