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