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w 4 <br /> f F <br /> 25 Mav 2001 <br /> AGE-NC Prod ect No 95-0111 <br />' Page 3 of 4 <br /> I <br /> 1 <br /> t <br /> Ethylbenzene and total xylenes were detected,in the groundwatersamples collected from MW-2 at <br />' concentrations of 0 66 ug/l and 0 61 ug/l, respectively <br /> MTBE was detected by EPA Method 8020 in the sample collected from MW-i at a concentration _ <br />' of 22 ugll MTBE was confirmed in the ground water sample collected from MWA and detected in <br /> ground water samples collected from MW-4 and MW-7 by EPA method 8260 at concentrations of <br />' 23 ug/l, 1 3 ug/1 and 4 0 ug/l, respectively No other fuel oxygenated compounds were detected at <br /> or above laboratory reporting limits in the ground water samples analyzed <br /> Analytical results of the ground water samples are summarized in Tables-2 and 3 The laboratory <br /> reports (MA[Laboratory Sample No 64005 through 64012), quality assurance and quality control <br /> report'and chain-of-custody forms are Included in Appendix B _ <br /> 1 <br /> 4.0. SUMMARY AND CONCLUSIONS" <br /> Based on the findings from this Investigation, AGE concludes <br />' The northerly ground water flow direction inferred from data collected during this <br /> monitoring event is consistent with ground water flow directions determined during past <br /> monitoring events at the site <br />' • The concentrations of TPH-g, TPH-d and BTEX detected in the ground water samples from <br /> MW-1,MW-4 and MW-5 remain near the low end of the range of concentrations previously <br /> detected The hydrocarbons are located primarily in the down-gradient direction from the <br />' UST facility I <br />' • MTBE was detected in samples from three wells (MW-1, MW-4 and MW-7) with the <br /> highest concentration (23 ugll) occurring immediately down-gradient of the UST facility <br /> (MW-1) Only trace concentrations of MTBE were detected in MW-4 and MW-7 A map <br />' illustrating the approximate extent of TPH-g-, TPH-d- and MTBE-impacted ground water <br /> is depicted on Figure 4 <br /> - r <br /> c <br /> 5.0 RECOMMENDATIONS <br /> Based on the findings of this investigation, AGE recommends, ' ' <br /> • Continued quarterly monitoring of the ground water monitoring wells The next monitoring <br />' event should be performed in June 2001 <br /> • Analysis of selected ground water samples for bioenumeration and physicochemical <br /> characteristics <br /> Advanced GeoEnvironmen#al Inc <br /> i <br /> 1 I <br />_ I <br />