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site refrigerator and picked up by a California Department of Health Services (DHS) certified <br />' laboratory for analysis for <br /> • <br />' • Total petroleum hydrocarbons 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 /> (BTEX) with Methyl tert-Butyl Ether (MTBE) by EPA Method $0.26 p.44 dW <br /> t <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 />' 3.3 Floating Oil <br /> Floating oil has been removed from MW-2 periodically, starting in January 2000 A total of <br />' approximately 15 9 gallons of oil has been removed and the results are summarized in Table 3 <br />' 4.0 DISCUSSION <br />' • 4.9 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 MW4 has not been <br /> affected by contamination from the former used oil USTs The sources of the gasoline and diesel <br /> contamination remain unknown at this time <br /> r4.2 Waste Oil USTs <br /> Analysis of MW-2 sampled on 25 June 2002 shows no contamination from MTBE MW-2 <br /> continues to show contamination from motor oils as reflected in the amount of floating oil <br /> removed during the past quarter and the analytical results MW-3 shows no contamination from <br /> motor oils this quarter MW-I and MW-4 continue to remain 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 /> Environeenng,Inc Prqect No 02 00716 Page 4 <br /> I <br />