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' 06 November 2002 <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 /> 1 <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 1,100 micrograms per liter (µg/l), 160,000µg11, 3,100 µg11, and 120 µg11, <br />' respectively <br /> Benzene was reported in samples collected from wells VW-1 and VW-3 at concentrations of 28,000 <br />' µg/1 and 1,400µg/l,respectively Toluene,ethylbenzene and xylenes were detected in samples MW- <br /> 6,VW-1 and VW-3 at concentrations as high as 46,000 µg/1 toluene, 3,200 µg/1 ethylbenzene and <br /> 16,000 µg/1 xylenes, in sample VW-1 <br /> The fuel additive MTBE was detected in wells MW-5, MW-7 and VW-1 through VW-4 at <br /> concentrations ranging between 2 2 and 590 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 />' 0209418-01 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 />' 0 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 TK1-90 (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 in the samples collected from vapor well VW-4 cross-gradient <br /> from the former UST area <br /> • <br />' advanced GeoEnvironmental,Inc <br />