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02 May 2003 <br /> AGE-NC Project No 95-0142 <br /> Page 3 of 4 <br /> (wells MW-6, MW-7 and MW-8) was toward the southeast with an average hydraulic gradient of <br /> 0 004 foot/foot (unchanged) The elevation of the ground water table at the site Is illustrated on <br /> Figure 3 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in samples collected from wells MW-6, VW-1, VW-3 and VW-4 at <br /> concentrations of 670 micrograms per liter (µg/1), 160,000µg/1, 3,800 µg/1, and 140 µg/1, <br /> respectively <br /> Benzene was reported in samples collected from wells VW-1 and VW-3 at concentrations of <br /> 26,000µg/1 and 560µg/l,respectively Toluene,ethylbenzene and xylenes were detected in samples <br /> MW-6,VW-1 and VW-3 at concentrations as high as 44,000 µg/1 toluene, 3,800 µg/1 ethylbenzene <br /> and 15,000 µg/1 xylenes, in sample VW-1 <br /> The fuel additive MTBE was detected in wells MW-5, MW-7 and VW-2 through VW-4 at <br /> concentrations ranging between 3 4 and 160 µg/1 <br /> No other oxygenated fuel additive detected in the ground water samples this quarter The analytical <br /> results are summarized on Tables 2 and 3 The laboratory report (MAI Laboratory I D Nos <br /> 0303023-01 to 09),quality assurance and quality control(QA/QC)report and chain-of-custody form <br /> are included in Appendix C <br /> 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 monitored zone <br /> defined by the shallow-screened well network and generally northeast and southeast at the <br /> Intermediate and deep monitored zones, respectively <br /> • The highest concentration of dissolved petroleum hydrocarbons continues to be In the area <br /> of the former UST TKI-90 (well VW-1)TPH-g and BTEX concentrations have Increased <br /> In water-table vapor well VW-3 up-gradient to cross-gradient of the former USTs, while <br /> concentrations have declined to non-detect in the samples collected from vapor well VW-4 <br /> cross-gradient from the former UST area <br /> Advanced GeoEnvironmental,Inc <br />