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. 02 April 1998 <br /> ,AGE-NC Project No 95-0111 <br />' Page 3 of 4 r <br /> ppb and 12 ppb, respectively, ethyl benzene was detected in MW-1, MW-2 and MW-4 at <br />' concentrations as high as 2 4 ppb, and xylenes were detected in samples from MW-1, MW-2, MW-4 <br /> and MW-5 at concentrations as high as 4 7 ppm <br />' MTBE was detected by EPA Method 8260 in samples collected from wells MW-1, MW-4 and MW- <br /> 5 at concentrations of 72 ppb, 320 ppb and 260 ppb, respectively Other oxygenated volatile organic <br /> compounds were not detected in any of the water samples <br /> Analytical results of ground water samples are summarized in Table 2 - 5020 and 8015m Analytical <br /> Results of Ground Water Samples Analytical results of ground water samples are summarized in <br />' Table 3 - 8260m Analytical, Results of Ground Water Samples The laboratory report (MAI <br /> Laboratory Nos 85570 to 85575), QA/QC report and chain-of-custody are included in Appendix B <br /> 4.0. CONCLUSIONS AND RECOMMENDATIONS <br />' 41 CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following <br /> • During the January 1998 monitoring event, ground water flow direction at the site was <br /> generally toward the northeast and towards the southwest, south of the UST area <br /> • In general, over the last quarter, concentrations of TPH-g declined slightly from the <br /> concentration range normal for this site in monitoring wells MW-1 MW-4 and MW-5, <br /> located at the northern edge of the site, and increased slightly in MW-2 <br /> • TPH-d concentrations increased in MW-2, MW-4 and MW-5, but are within previous high <br /> and low concentrations for each well TPH-d was undetected in MW-1 <br /> • The concentrations of BTE&X fluctuated at low or undetectable concentrations in <br />' monitoring wells MW-1, MW-2, MW-4 and MW-5 Petroleum hydrocarbons were not <br /> detected in monitoring wells MW-3 or MW-6 F <br /> • It appears that monitoring well MW-6 is located beyond the down-gradient margin of the <br />' plume of dissolved hydrocarbons I <br /> • The plume of dissolved petroleum hydrocarbons does not appear to be migrating, although <br /> concentrations of dissolved hydrocarbons within the plume fluctuate With the exception of <br /> MTBE in MW-5, none of the concentrations of any of the analytes in any of the samples <br />' exceeded previously detected high concentrations MTBE concentrations decreased in MW- <br /> 1, but�increased in MW-4 and MW-5 <br /> i 1 <br /> Advanced GeoEnvironmental Inc, <br /> r <br />