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- Volatile aromatic compounds — benzene, toluene, ethyl benzene and total xylenes <br /> (BTEX) with Methyl tert-Butyl Ether (MTBE) by EPA Method 8020 <br /> I - Fuel oxygenated compounds — di-isopropyl ether (DIPE), ethyl-t-butyl ether (ETBE), <br /> tert-amyl methyl ether (TAME), t-butanol (TBA) by EPA Method 8260 <br />' <br /> 33 Floating Oil <br />' Floating oil has been removed from MW-2 periodically, starting in January 2000 A total of <br /> approximately 13 5 gallons of oil has been removed and the results are summarized in Table 3 <br /> 40 DiscussiON <br />' 4.1 MW-4 <br />' Groundwater from MW-4 shows contamination from TPH-gasoline, TPH-diesel, oxygenates and <br /> BETX It remains free from motor oil contamination, indicating that MW-4 has not been <br />' affected by contamination from the former used oil USTs The source of the gasoline and diesel <br /> contamination is unknown at this time <br /> 4.2 Waste Oil USTs <br /> Analysis of MW-2 sampled on 27 December 2001 shows no contamination from TPH-gasoline, <br /> MTBE, BETX or DIPE MW-2 continues to show contamination from motor oils as reflected in <br /> the amount of floating oil removed during the past quarter and the analytical results MW-3 <br /> shows contamination from motor oils for the first time MW-1 and MW-4 continue to remain <br /> free of motor oils contamination <br /> 4 3 Diesel USTs <br /> MW-1 (site of the former diesel USTs) showed contamination from diesel The TPH-diesel <br /> contamination levels, as shown in Figure 5, dropped for four (4) quarters to ND and the <br /> increased for the following two (2) quarters Contamination from THP-gasoline, MTBE, <br /> Benzene, Toluene and Ethyl Benzene is now apparent <br /> IMW-3 continues to be free of diesel contamination However, diesel contamination did appear <br /> • <br /> Ernironeerin ,Inc9 Project No 02-001014 Page 4 <br />