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I29 December 2004 <br /> AGE-NC Project No 95-0130 <br /> Page 8 of 10 <br /> I BTEX were detected in samples collected from well MW-6E(137-142 feet),the approximate <br /> extent of dissolved TPH-g is depicted ;n Figures 5 and 7 <br /> • The greatest concentrations of Top Filling Station dissolved MTBE were detected at <br /> I concentrations as high as 4,200 gg/l in the samples collected from wells VW-3A(screened <br /> 43 to 63 feet) and MW-6B (screened 50 to 55 feet), the approximate extent of dissolved <br /> MTBE is depicted in Figures 6 and 8 <br /> I • Significant concentrations of 1,2-DCAwere detected or have consistently been detected from <br /> wells MW-3, MW-8, MW-6B, MW-6C, VW-IB, VW-1C, VW-2A, VW-2B and VW-3A <br /> indicating a significant 1,2-DCA-impact to ground water at the site <br /> • TBA was not detected in any of the analyzed water samples,however, TBA was previously <br /> detected in wells MW-1, MW-2, MW-3, MW-5, VW-1C, VW-2A, VW-2B and VW-3A, <br /> Isuggesting a minor TBA-impact to ground water at the site <br /> • EDB has previously been detected from wells MW-7B, VW-1B, VW-IC and VW-2A at <br /> Iconcentrations significantly above the DHS's Maximum Contaminant Level (MCL) in <br /> drinking water <br />' . • TAME was detected in ground water samples collected from wells MW-3, MW-6 (B-D), <br /> MW-7(B, C),VW-1C,VW-2A and VW-3A at concentrations as high as 80 µg/l (VW-1C) <br /> This is the second consecutive time TAME has been detected in ground water samples <br />' collected from the site,with the exception of one detection of TAME in December 2003 and <br /> March 2003 in wells VW-2A and VW-3A, respectively <br /> • The high concentrations ofpetroleum hydrocarbons detected in samples collected from wells <br />' MW-6(B and C),MW-7(A and B),VW-1 C,VW-2A and VW-3A indicated that these wells <br /> are within or near the dissolved petroleum hydrocarbon"core area"of the plume (Figures 5 <br />' through 8) <br /> • The lateral and vertical extent of the dissolved petroleum hydrocarbon plume Is not known <br /> toward the northwest,north,northeast, east and southeast of the area bound by wells MW-1 <br />' through MW-7 (Figures 5 through 8) <br />' Based on SVE remediation data collected between 31 August and 01 October 2004,AGE concludes <br /> • Analytical results of SVE inlet vapor concentrations ranged between 98,000 µg/1 and 35,000 <br />' µg/1, the average SVE inlet vapor concentration was approximately 71,333 µg11, <br /> • The average SVE inlet flow rate was approximately 18 cubic feet per minute, the average <br />' differential pressure measurements were recorded at 0 10 inches of water (Table 6, <br /> Appendix H) <br />' Advanced GcoEnvironmental,Inc <br /> 1 <br />