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A� <br /> 04 April 2000 <br /> AGE-NC Project No 95-0142 <br /> Page 3 of 4 <br /> F <br /> Benzene was reported in samples collected from wells MW-6 and VW-1, VW-3, and VW-4 at <br /> concentrations ranging from 14 4g11 (VW-4) to 29,000 ggll (VW-1) Toluene, ethylbenzene and <br /> xylenes were also reported in wells MW-6, MW-7, VW-1, VW-3, and VW-4 at concentrations as " <br /> high as 45,000 ,ug/1 (toluene, VW-1) <br /> MTBE was reported in water samples collected during the January 2000 monitoring event MTBE <br /> I was reported using EPA method 8260 Modified in the ground water samples collected from wells <br /> MW-5, MW-7, MW-8, VW-1, VW-2, VW-3 and VW-4 at concentrations of 4 8 4g11, 13 µg/l, 1 5 fi <br /> ,ug/l, 620 µg/l, 4 3 4g11, 43 ggll, and 23 µg/l, respectively TBA was detected in the water sample <br /> Icollected from VW-4 at a concentration of 6 5 ggll <br /> TPH-g was not reported in samples collected from MW-4, MW-5, MW-7, and MW-8, BTEX <br /> constituents were not reported in the samples collected from MW-4, MW,5, MW-8, and VW-2 <br /> Analytical results for ground water samples analyzed by EPA Methods 8015 Modified'and 8020 are ` <br /> summarized in Table 2 Analytical results for the ground water samples as analyzed by EPA Method <br /> 8260 Modified are summarized in Table 3 The laboratory report(MAI Laboratory I D Nos 29663 <br /> through 29671), quality assurance and quality control (QA/QC) report and chain-of-custody form <br /> are Included In Appendix B <br /> 40 CONCLUSIONS <br /> Based on data collected from the site, AGE concludes <br /> • Ground water flow direction appeared to be northwest in the area defined by the well <br />' network on the site The elevation of ground water in well MW-5 appears to be anomalously <br /> low <br /> • The highest concentration of dissolved petroleum hydrocarbons continues to be in the area <br />' of the documented release (vapor well VW-1), located immediately adjacent to the former <br /> location of TK1-90 UST <br />' Significant concentrations of TPH-g and benzene and low concentrations of MTBE were <br /> reported in samples from the deeply screened well MW-6 (screened 70 to 80 feet bsg) <br /> Presently, MW-6 Is screened approximately 44 feet below the surface of first-encountered <br />' ground water Two additional wells (MW-7 and MW-8) screened across the same strata have , <br /> not yielded hydrocarbon-impacted water samples during the first sampling event These wells <br /> are located in the apparent down gradient from well MW-6 <br /> y Advanced GeoEnvironmental,Inc <br /> , <br />