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diesel TPH-gasoline contamination appeared this quarter Minor contamination from BTEX <br /> remains, but no MTBE or oxygenates contamination is present Motor oil contamination <br /> • � 2aU7 <br /> continued the signtficantly drop, first evidenced in IV�arcl 2 02, and maintained to the present <br /> (110,000 ppm to 42 ppm) <br /> MW-3 continues to remain free from contamination <br /> MW-4 continued to show similar levels of TPH-gasoline, BTEX and DIPE contamination, but <br /> no diesel or motor oil contamination <br /> All groundwater samples secured by EI were logged in a chain-of-custody form, placed in an on- <br /> site refrigerator and picked up by a California Department of Health Services (DHS) certified <br /> laboratory for analysis for <br /> Total petroleum hydrocarbons as diesel, oil and gasoline (TPHg, TPHd and TPHo) by <br /> iEPA 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�b <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 /> I <br /> 3.3 Floating Oil <br /> IFloating oil has been removed from MW-2 periodically, starting in January 2000 A total of <br /> approximately 17 3 gallons of oil has been removed The results are summarized in Table 3 <br /> 40 DISCUSSION <br /> 4.1 MW-4 <br /> Groundwater from MW-4 continued to show contamination from TPH-gasoline, 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 TPH-diesel contamination. has <br /> Idisappeared after a year of contamination The source of the gasoline contamination remains <br /> Environeenng,Inc Project No 03 002 18 Page 4 <br /> I <br />