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f <br /> i <br /> ..n e <br /> TABLE 4 <br /> ANALYTICAL RESULTS-GROUNDWATER MONITORING WELLS <br /> San Joaquin County Agricultural Commissioner's Office- <br /> 503 East 10th Street,Tracy,California <br /> OXYGENATES <br /> DATE ETHYL- <br /> WELL ID SAMPLED TPH-D TPH-G BENZENE TOLUENE BENZENE XYLENES MTBE DIPE ETBE TAME TBA DO <br /> MW-1 11/05/98 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<5 2.1 <br /> MW-2' 11/05/98 140 ND<50 ND<0.5 ND<0.5 ND<0:5 ND<0.5 ..ND<0:5 ND<0.5 ND<0=5 ND<0.5- ND<5.— <br /> MW-3 11/05/98 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<5 2.4 <br /> NOTES: All results except DO are reported in micrograms/liter which translates to parts per billion(ppb) <br /> Total Petroleum Hydrocarbons as Diesel(TPH-D)and TPM-as-Gasoline(TPH-G)analyses by Modified EPA Method 8015 <br /> Benzene,toluene,ethylbenzene and xylenes analysis by Modified EPA Method 8020 <br /> Oxygenates Methyl-t-butyl ether(MTBE).Diisopropyl ether(RIPE),Ethyl-t-butyl ether(ETRE),Tert-amyl methyl ether(TAME)and Tert-Butanol(TBA)by EPA 8260 . <br /> Dissolved Oxygen(DO)measured in parts per million(ppm)using the azide.modification of the Winkler Method(field titration kit) <br /> ND<50=Not Detected at reporting limit of 50 ppb <br />