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,1 <br /> N 24 October 2003_ <br /> AGE-NC Project No 95-0142 <br /> Page 3 of 4 <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 250 micrograms per liter(gg/1), 160,000 gg/l, 160 gg/l, 3,600 gg/l, and 180 µg/l, <br /> respectively <br />' Benzene was reported in samples collected from wells VW-1 through VW-4 at concentrations as <br /> high as of 24,000 gg/1 Toluene,ethylbenzene and xylenes were detected in samples MW-6,VW-1 <br /> through VW-4 at concentrations as high as 36,000 gg/1 toluene, 3,300 gg/l ethylbenzene and <br />' 14,000 gg/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 4 7 and 600 gg/l TBA was detected in the sample from well VW-4 <br /> at 7 6gg/1 No other oxygenated fuel additives were detected in the ground water samples this <br /> quarter The analytical results are summarized on Tables 2 and 3 The laboratory report (MAI <br />' Laboratory I D Nos 03090526), quality assurance/quality control (QA/QC) report and chain-of- <br /> custody form are included in Appendix C <br /> lie <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 northeast in the monitored zone <br /> defined by the well network, which is similar to historical trends <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 decreased to below detectable limits in the samples collected from <br /> vapor well VW-4, located cross-gradient from the former UST area <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 /> Monitoring wells MW-6, <br /> MW-7 and MW-8 are screened approximately 45 feet below the <br /> surface of first-encountered ground water MTBE has been detected in the samples collected <br /> from well MW-7 for six consecutive quarters, but has not been detected in the samples <br /> collected from well MW-6, beneath the former UST area <br /> Advanced GeoEnrnronmental,Inc <br />