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'. 27 December 2001 <br /> AGE-NC Project No 95-0142 <br />' Page 3 of 4 <br /> 5 <br />' 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in samples collected from wells MW-6, VW-1, VW-2 VW-3 and VW-4 at <br />' concentrations of 2,100 micrograms per liter (p.g/l), 200,000gg/l, 58gg/l, 6,700gg/1 and 96 µg11, <br /> respectively Benzene was reported in samples collected from wells MW-6, VW-1 and VW-3 at <br /> concentrations of 5 6 gg/l, 23,000 gg/l and 1,500 µg11, respectively Toluene, ethylbenzene and <br />' xylenes were variously detected in the same samples at concentrations as high as 39,000µg/1(toluene <br /> in VW-1) <br />' MTBE was detected by EPA Method 8020 in wells MW-5 and MW-7 at concentrations of 5 6gg/I <br /> and 7 9 µg/l, respectively MTBE was detected by EPA Method 8260 in wells MW-5, MW-7 and <br /> VW-1,VW-2, VW-3 and VW-4 at concentrations of 1 gg/l, 8 1 gg/l, 440 pg/l, 6 5 gg/l, 130 gg/l <br />' and 12 gg/l,respectively MTBE was the only oxygenated fuel additive detected in the ground water <br /> samples this quarter <br />' r The analytical results are summarized on Tables 2 and 3 The laboratory report (MAI Laboratory, <br /> . 1 D Nos 82951 through 82989),quality assurance and quality control(QA/QC)report and chain-of-, <br />' custody form are included in Appendix B <br /> 1 4.0. CONCLUSIONS <br /> Based upon data collected from the site during the current and preceding ground water monitoring <br />' events, AGE concludes <br /> • Ground water flow direction appeared to be toward the northwest in the area defined by the <br />' shallow-screened well network on-site <br /> • The highest concentration of dissolved petroleum hydrocarbons continues to be in the area <br />' the former location of TK1-90 UST <br /> • Low concentration BTEX compounds and MTBE were reported in samples collected from <br /> vapor well VW-4, which is located in the current down-gradient direction from the former <br /> location of TK1-90 UST, the area with the known highest concentration of dissolved <br /> petroleum hydrocarbons <br />' • TPH-g and BTEX concentrations have declined in the samples collected from the deep <br /> screened well MW-6 (screened 70 to 80 feet bsg) Presently, MW-6 is screened <br /> approximately 45 feet below the surface of first-encountered ground water <br /> 1 , <br /> • <br /> 1 <br />