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1 <br /> 25 October 2001 <br /> AGE-NC Project No 95-0103 - <br /> Page 3 of 4 <br /> ' 3 2 GROUND WATER ANALYTICAL RESULTS ` <br /> ti <br /> i 1 1 <br /> Seven ground water samples were analyzed for TPH-g, BTEX and fuel additives TBA, DIPE, <br /> ' MTBE, ETBE and TAME <br /> i <br /> TPH-g was detected in samples from monitoring wells MW-1, MW-3, MW-4 and MW-5, at <br /> ' concentrations of 4,000 microgram per liter (gg/l), 4,300 ug/l, 26,000 µg11 and 290 µg/l, <br /> respectively Benzene was detected in three of the water samples (samples MW-1, MW-3 and MW- <br /> 4)at concentrations ranging from 55 ug/1 in well MW4 to 5,600,ccg/1 in well MW-4 The remauung <br /> BTEX compounds (toluene, ethylbenzene and xylenes) were detected in samples MW-1, MW-3, <br /> MW-4, and MW-5, with the l ghest concentrations occurring in sample MW-4 <br /> 1 MTBE was detected in the water samples from well MW-1 and MW-3 at concentrations of 36,ug/1 <br /> and 1 1 ,ug/1, respectively DIPE was detected in sample MW-3 at a concentration of 11 µg/l TBA <br /> was detected in samples MW-1 and MW-3 at 41 ,ug/l and 10µg/1, respectively <br /> The analytical results of current and previous monitoring well samples are summarized in Tables 2 <br /> '. and 3 The laboratory report of the current ground water sampling data(MAI Lab IDs 77613 through <br /> 77619), quality assurance and quality control (QA/QC) data and chain-of-custody form are included <br /> in Appendix B <br /> 1 1 1 <br /> 4.0. DISCUSSION/CONCLUSIONS <br /> Based on the analytical results from this investigation, AGE concludes the following <br /> ' The relative ground water elevation at the site decreased 2 3 feet since the monitoring event <br /> in May The map of ground water contours indicates a convergent ground water flow <br /> direction toward the southeast to east <br /> ' Ground water levels in monitoring wells MW-1, MW-2, MW-3 and MW-4 were <br /> • approximately one to three feet above the top of the screened interval til <br /> • TPH-g was detected this quarter in on site motoring wells MW-1 and MW-4 at high " <br /> concentrations and at lower concentrations off-site In general, the TPH-g concentrations <br /> ' have increased when compared to the results from the May sampling event <br /> •` A significant increase of TPH-g and benzene concentrations has occurred in the sample from <br /> well MW-4, compared to the May sample results <br /> 1 • Fuel oxygenates,mcluduig MTBE,DIPE or TBA,were variously detected in samples MW-1, <br /> MW-3, and MW-5 The highest oxygenate concentrations were detected in sample MW-1 <br /> Advanced GeoEn"ronmental,Inc. <br /> 1 H , <br />