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i � a <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 D1PE ETBE Ethanol 1,2-DCA EDB as NO3 <br /> ID Collected {pg/L) ( /L) ( ) ( /L) { ) {Ag/L) ( ) ( ) (m /L) <br /> DW 02/07/01 <2 00 <200 <2 00 <2 00 <2 00 NA NA NA 16 <br /> 09/05/01 <2 0 <200 <2 0 <2 0 <2 0 NA NA NA 15 <br /> 11/12/01 <10 <100 <10 <10 <10 NA NA NA 17 <br /> f 03/26/02 <0 50 <5 0 <0 50 <0 50 <0 50 NA NA NA 17 <br /> 06/21/02 <0 50 <5 0 <0 50 <0 50 <0 50 NA NA NA NA <br /> 09/18/02 <0 50 <5 0 <0 50 <0 50 <0 50 NA NA NA NA <br /> 12/23/02 <0 50 <5 0 <0 50 <0 50 <0 50 NA NA NA NA <br /> 03/24/03 <0 50 <20 <0 50 <0 50 <0 50 <100 NA NA NA <br /> 06/16/03 <0 50 A <20 A <1 0 A <1 0 A <1 0 A <100 A NA NA NA <br /> 09/19/03 <0 50 A <20 A <10 A <1 0 A <10 A <100 A <0 50 A <0 50 A NA <br /> 12/23/03 <0 50 A <20 A <10 A <1 0 A <1 0 A <100 A <0 50 A <0 50 A NA <br /> 03/16/04 <0 50 A <20 A <1 0 A <1 0 A <1 0 A <100 A <0 50 A <0 50 A NA <br /> 06/22/04 <0 50 A <20 A <1 0 A <1 0 A <1 0 A <100 A <0 50 A <0 50 A NA <br /> 09/07/04 <0 50 A <20 A <1 0 A <1 0 A <1 0 A <100 A <0 50 A <0 50 A NA <br /> 12/21/04 <0 50 A <20 A <1 0 A <1 0 A <10 A <100 A <0 50 A <0 50 A NA <br /> 03/15/05 <0 50 A <20 A <1 0 A <1 0 A <1 0 A <100 A <0 50 A <0 50 A NA <br /> 06/21/05 <0 50 A <20 A <0 50 A <0 50 A <0 50 A <100 A <0 50 A <0 50 A NA <br /> 09/19/05 <0 50 A <20 A <0 50 A <0 50 A <0 50 A <100 A <0 50 A <0 50 A NA <br /> 12/19/05 <0 50 A <20 A <0 50 A <0 50 A <0 50 A <100[8] J <0 50 A <0 50 A ni <br /> Arco_6100_Quarter1y_Data Page 7 of 8 <br /> srR,arUs <br />