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I <br /> (BTEX)with Methyl tert-Butyl Ether(MTBE)by EPA Method 8020 <br /> • Fuel oxygenated compounds — di-isopropyl ether (D1PE), ethyl-t-butyl ether (ETBE), <br /> tert-amyl methyl ether(TAME),t-butanol (TBA) by EPA Method 8260 <br /> 1 V, <br /> 6.0 Floating Oil <br />' Floating oil has been removed from MW-2 periodically, starting in January 2000 A total of <br /> approximately 19 8 gallons of oil has been removed The results are summarized in Table 3 <br /> 7 0 Discussion �b <br /> I7.1 MW-4 <br /> Groundwater from MW-4 continued to show contamination from TPH-gasoline, oxygenates <br />' and BETX The TPH-gasolme contamination increased slightly MW4 remains free from <br /> motor oil contamination, indicating that it has not been affected by contamination from the <br /> former used oil USTs MW-4 has remained free from THP-diesel contamination since June <br /> 2002 The source of the gasoline contamination remains unknown at this time J <br /> 7.2 Waste Oil USTs <br /> Analysis of MW-2 sampled on 11/11/03 continued to show contamination from all <br /> contaminates analyzed MW-2 showed contamination from motor oils as reflected in the <br /> amount of floating oil removed during the past quarter and the analytical results The level of <br /> • oil contamination has dropped continuously from 2001 MW-1, MW-3 and MW4 continue to <br /> remain free of motor oils contamination, indicating that they have not been affected by <br /> contamination from the former used oil USTs <br /> 73 Diesel USTs <br /> MW-1 (site of the former diesel USTs)no longer showed contamination from diesel The TPH- <br /> Idiesel coytaminlar level, as shown in Figure 5, dropped to ND in June 2001, peeked at 72 <br /> ppm in Qt"- l and has continued to decrease to ND since then Contamination from THP- <br /> gasoline has reappeared <br /> Diesel contamination continues to appear in MW-2 MW-4 and MW-3 continued to show no <br /> diesel contamination <br /> The reversal of trends over the past 3 years may have resulted from the extreme changes in <br /> groundwater elevation (Figure 4), a 7 foot drop from April 2000 to September 2001, a 4 foot <br /> increase to March 2002, 4 foot drop to September 2002 and a 3 foot decrease the past two <br /> quarters <br /> • 6 <br />