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I r <br /> 29 October 2002 <br /> AGE-NC Project No 98-0521 <br /> Page 3 of 4 <br /> i <br /> • BTEX compounds were detected only in the sample collected from monitoring well MW-4 <br /> ' at concentrations of 76µg11 benzene, 19µg/l ethylbenzene and 26µg/l total xylenes Toluene <br /> was not detected in the samples collected from wells MW-1 through MW-4 <br /> I <br /> t MTBE was detected in wells MW-1, MW-2 and MW-4 by EPA method 8260B at <br /> concentrations of 41 µg/1, 370 µg/l and 230 µg/l, respectively <br /> ' No fuel oxygenates were detected in the samples collected during the August 2002 <br /> monitoring event <br /> ' Analytical results from the monitoring well groundwater samples are summarized in Tables 2 and 3 <br /> The laboratory report (MAI Lab IDs 0208457-001'through 0208457-004),QA/QC and chain-of- <br /> custody are included in Appendix B <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br /> • Ground water at the site was encountered at approximately 8 5 feet bsg The prevailing <br /> ground water flow direction at the site has been generally toward the northeast for eight <br /> monitoring events The ground water hydraulic gradient was estimated to be 0 013 foot/foot <br /> 0 Dissolved phase hydrocarbons, including TPH-g, BTEX and MTBE were present in the <br /> sample from MW-4, located within the former UST area MTBE was also detected in the <br /> ' samples collected from MW-1 and MW-2, located cross-gradient and down-gradient, <br /> respectively, from the former UST area <br /> j 15.0. RECOMMENDATIONS <br /> Based on the results of this Investigation, AGE recommends <br /> • Continuation of quarterly monitoring at the site The next monitoring event should be <br /> scheduled,for November 2002 <br /> • Preparation of a Problem Assessment Report <br /> 1 I Y <br /> r <br /> 1 ; <br /> ' • ' 4 I , , ` el <br /> ' Advanced GeoEnvironmehtal,Inc <br /> n <br /> EE r <br /> 11� t i�� <br />