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I ' <br /> 31 July 2000 <br /> AGE-NC Project No 95-0142 <br />' Page 3 of 4 <br /> concentrations ranging fiom 0 69 gg/l to V 1V-4 to 22,000 µg11 m V W-1 Toluene, ethylbenzene and <br />' xylenes were also detected in these same wells at concentrations as high as 30,000 gg/l (toluene in <br /> VW-1) r <br /> MTBE was detected in wells MW-5, through MW-8 and VW-I through VW-4 at concentrations of <br /> 1 7 gg/l, 13 µg11, 1 7 gg/l, 930 ggll, 7 9 µg11, 69 µg11, and 12 gg/l, respectively TBA was detected <br /> in the samples MW-4 and VW-4 at concentrations of 13 gg/l and 6 5 gg/l, respectively, <br /> ' <br /> The analytical results are summarized on Tables 2 and 3 The laboratory report (MAI Laboratory <br /> 1 I D Nos 40792 through 40800),quality assurance and quality control(QA/QC)i eport and chain-of- <br /> custody form are included in Appendix B <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 /> O Ground water flow direction appealed to be toward the south in the area defined by the , <br /> shallow sci eened well netwoi k and towai d the southeast in the area defined by the deeper <br />' sci eened well network <br /> G The highest concentration of dissolved petroleum hydrocarbons continues to be in the area ' <br /> a of the documented release (vapor well VW-1), located immediately adjacent to the former <br /> location of TK1-90 UST (Figure 2) TPH-g and BTE&X were not reported in samples <br /> collected fi om wells MW-4 and MW-5 which are located in the down-gradient dii ection <br /> However, low concentrations of MTBE have been reported in MW-5 seven times dui ing the <br /> ' last nine sampling events , ' <br /> • , Significant concentrations of TPH-g and benzene were reported in samples from the deeper <br /> screened well MW-6 (sci eened 70 to 80 feet bsg) Presently, MW-6 is screened <br /> approximately 44 feet below the surface-of first-encountered ground water Two additional <br /> wells(MW-7 and MW-8) screened across the same depth and strata interval did not yielded <br /> significant hydrocarbon-impacted water sample during this sampling event, although low <br /> concentrations of MTBE were detected in both wells These wells are located in the apparent <br /> down gi adient from well MW-6 <br /> 16 <br /> „ 4 � <br /> r <br /> o <br />