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02 April 2002 <br /> 'i AGE-NC Project No 95-0142 <br /> 1 Page 3 of 4 <br /> Ground water flow direction in the deep monitored water zone (wells MW-6, MW-7 and MW-8) <br />' was toward the southeast with an average hydraulic gradient of 0 003 feet/feet The elevation of the <br /> ground water table at the site is illustrated on 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 1,600 micrograms per liter (µg/l), 130,000µg/1, 3,700 µgd, and 81 µg11, <br />' respectively Benzene was reported in samples collected from wells MW-6, VW-1 and VW-3 at <br /> concentrations of 2 1 µg/l, 17,000µg/1 and 440µg/l,respectively Toluene,ethylbenzene and xylenes <br /> were detected in samples at concentrations as high as 28,000 µg/l (toluene in VW-1) <br /> MTBE was detected in wells MW-5,MW-7 and VW-1,VW-2,VW-3 and VW-4 at concentrations <br /> of,2 9 µg/l, 7 9 µg/l, 340 µg/1, 2 8 µg11, 140 µg/l and 4 0 µg/l, respectively MTBE was the only <br />' oxygenated fuel additive detected in the ground water samples this quarter <br /> The analytical results are summarized on Tables 2 and 3 The laboratory report (MAI Laboratory <br /> lie I D Nos 89266 through 89274),quality assurance and quality control(QA/QC)report and chain-of- <br /> custody form are included in Appendix B <br />' <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 TK1-90 (well VW-1) ' <br /> • TPH-g and BTEX concentrations have steadily declined in the samples collected from the <br /> ,deep 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 />