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i <br /> TABLE 4 <br /> GROUNDWATER ANALYTICAL RESULTS <br /> FOR OXYGENATES AND ADDITIONAL COMPOUNDS <br /> Former ARCO 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 ( ) (}ig/L) (lZ ) ( gIL) (µglL) ( L) W/W ( /L) (mg[L) <br /> VW-6 02/08/01 160 <200 <2 00 <2 00 <2 00 NA NA NA <1 0 <br /> 11/06/01 230 <20,000 <200 <200 <200 NA NA NA NA <br /> 03/26/02 270 <50[l] <5 0[1] <5 0[1] <5 0[1] NA NA NA NA <br /> 06/21/02 330 170 <5 0 <5 0 <5 0 NA NA NA NA <br /> 09/18/02 300 270 <25 <25 <25 NA NA NA NA <br /> 12/23/02 310 <100 <10 <10 <10 NA NA NA NA <br /> 03/24/03 2,800 <20,000 <500 <500 <500 <100,000 NA NA NA <br /> 06/16/03 170 A <4,000[1,2] J <200[l] J <200[l] J <200[l] J <20,000[1] J NA NA NA <br /> 09/19/03 <250 A <10,000 A <500 A <500 A <500 A <50,000 A <250 A <250 A NA <br /> 03/16/04 170 A <4,000 A <200 A <200 A <200 A <20,000 A <100 A <100 A NA <br /> 09/07/04 <250 A <10,000 A <500 A <500 A <500 A <50,000 A <250 A <250 A NA <br /> 12/21/04 <250 A <10,000 A <500 A <500 A <500 A <50,000 A <250 A <250 A NA <br /> 03/15/05 170 A <2,000 A <100 A <100 A <100 A <10,000 A 88 A <50 A NA <br /> 09/19/05 170 A <2,000 A <50 A <50 A <50 A <10,000 A <50 A <50 A NA <br /> VW-14 09/19/05 <50 A <2,000 A <50 A <50 A <50 A <10,000 A 77 A <50 A NA <br /> VW-20 06/16/03 450[1] J <10,000[l] J <500[l] J <500[1] J <500[1] J <50,000[l] J NA NA NA <br /> i <br /> srwarus <br /> Arco_6I00_Quarter1y_Data Page 5 of 7 <br />