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TABLE 4 <br /> GROUNDWATER ANALYTICAL RESULTS <br /> FOR OXYGENATES AND ADDITIONAL COMPOUNDS <br /> ARCO Service Station No 6100 <br /> 25775 Patterson Pass Road <br /> Tracy,California <br /> Nitrate <br /> Sample Date MTBE TBA TAME DIPE ETBE Ethanol 1,2-DCA EDB as NO3 <br /> ID Collected (&L) ( { IL) W/O W/O W/O ( IL) (µ IL) (m ) <br /> VW-1 06/22/04 <1,000 A <40,000 A <2,000 A <2,000 A <2,000 A <200,000 A 2,000 A <1,000 A NA <br /> 09/07/04 620 A <20,000 A <1,000 A <1,000 A <1,000 A <100,000 A <500 A <500 A NA <br /> VW-2 02/08/01 395 218 <2 00 <2 00 <2 00 NA NA NA <1 0 <br /> 03/26/02 350 <50[1] <5 0[1] <5 0[l] <5 0[1] NA NA NA NA <br /> 03/16/04 61 A <200 A <10 A <10 A <10 A <1,000 A 16 A <5 0 A NA <br /> 06/22/04 <250 A <10,000 A <500 A <500 A <500 A <50,000 A <250 A <250 A NA <br /> VW-3 02/08/01 1,000 387 570 <2 00 <2 00 NA NA NA <1 0 <br /> 03/26/02 490 <100[ll <10[1] <10[1] <10[ll NA NA NA NA <br /> 03/16/04 180 A <2,000 A <100 A <100 A <100 A <10,000 A <50 A <50 A NA <br /> 06/22/04 970 A <20,000 A <1,000 A <1,000 A <1,000 A <100,000 A <500 A <500 A NA <br /> 09/07/04 360 A <4,000 A <200 A <200 A <200 A <20,000 A <210 A <100 A NA <br /> VW-4 02108/01 1,890 <20,000 <200 <200 <200 NA NA NA <10 <br /> 09/18/02 1,200 <2,500 <250 <250 <250 NA NA NA NA <br /> 06/22/04 <250 A <10,000 A <500 A <500 A <500 A <50,000 A 960 A <250 A NA <br /> Arco_6100Quarterly Data Page 3 of 6 577RAW5 <br />