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- Volatile aromatic compounds — benzene, toluene, ethyl benzene and total xylenes <br /> M (BTEX) with Methyl tert-Butyl Ether (MTBE) by EPA Method 8020 <br /> icXo,(b 4rA <br />' - Fuel oxygenated compounds -- di-isopropyl ether (DIPE), ethyl-t-butyl ether (ETBE), <br /> Cert-amyl methyl ether (TAME), t-butanol (TBA) by EPA Method 8260 <br /> 1 <br /> 3.3 Floating Oil <br />' Floating oil has been removed from MW-2 periodically, starting in January 2000 A total of <br /> approximately 14 4 gallons of oil has been removed The results are summarized in Table 3 <br /> 4.0 DiscusSION <br /> 41 MW-4 <br /> IGroundwater from MW-4 shows contamination from TPH-gasoline, TPH-diesel, oxygenates and I <br /> BETX It remains free from motor oil contamination, indicating that MW-4 has not been <br /> Iaffected by contamination from the former used oil USTs The source of the gasoline and diesel <br /> contamination is unknown at this time <br /> lie <br /> 4.2 Waste Oil USTs <br /> Analysis of MW-2 sampled on 21 March 2002 shows no contamination from MTBE or DIPE <br /> MW-2 continues to show contamination from motor oils as reflected in the amount of floating oil <br /> Iremoved during the past quarter and the analytical results MW-3 also shows contamination <br /> from motor oil MW-1 and MW-4 continue to remain free of motor oil contamination <br /> I <br /> 4.3 Diesel USTs <br /> MW-1 (site of the former diesel USTs) showed contamination from diesel The TP - <br /> H diesel <br /> Icontamination levels, as shown in Figure 5, dropped for four (4) quarters, reaching ND in June <br /> 2001 It returned in September 2001 and remained relatively constant for the following quarters <br /> Contamination from THP-gasoline remains <br /> MW-3 showed diesel contamination for the first time since the second quarter in 2000 Diesel <br /> contamination continues to appear in MW-2 as well as MW-4 <br /> Environeering,Inc Project No 02 004 15 Page 4 <br />