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laboratory for analysis for <br />' Totaletroleum hydrocarbons p y ocarbons as diesel, oil and gasoline (TPHg, TPHd and TPHo) by <br /> EPA Method 8015 <br /> • Volatile aromatic compounds — benzene, toluene, ethyl benzene and total xylenes <br /> �� <br /> (BTEX) with Methyl tert-Butyl Ether(MTBE) by EPA Method ffa-20U <br /> • 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 /> 33 Floating Oil <br />' Floating oil has been removed from MW-2 periodically, starting in January 2000 A total of <br /> approximately 16 5 gallons of oil has been removed and the results are summarized in Table 3 <br /> 1 4.0 DISCUSSION <br /> r4.1 MW-4 �J <br /> Groundwater from MW-4 shows contamination from TPH-gasoline, oxygenates and BETX It <br /> remains free from motor oil contamination, indicating that MW-4 has not been affected by <br /> contamination from the former used oil USTs TPH-diesel contamination has disappeared after a <br /> year of contamination The source of the gasoline contamination remain unknown at this time <br /> 4.2 Waste Oil USTs <br /> Analysis of MW-2 sampled on 11 September 2002 shows no contamination from MTBE or <br /> TPH-gasoline MW-2 continues to show contamination from motor oils as reflected in the <br /> amount of floating oil removed during the past quarter and the analytical results MW-1, MW-3 <br /> and MW-4 continue to remain free of motor oils contamination r <br /> 4.3 Diesel USTs <br /> MW-1 (site of the former diesel USTs) showed contamination from diesel The TPH-diesel <br /> contamination level, as shown in Figure 5, dropped to ND in June 2001, increased to 59 ppm in <br /> • <br /> IEnvironeering,Inc <br /> Project No 02 00917 Page 4 <br />