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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 I,2-DCA EDB as NO3 <br /> ID Collected ( /L) (HSI) ( /L) { ) ( ) ( IL) ( ) ( ) (m ) <br /> VW-5 02/08/01 941 <200 <2 00 <2 00 <2 00 NA NA NA <1 0 <br /> 11/06/01 3 3 <100 <1 0 <1 0 <1 0 NA NA NA NA <br /> 03/26/02 67 <5 0 <0 50 <0 50 <0 50 NA NA NA NA <br /> 06/21/02 16 <5 0 <0 50 <0 50 <0 50 NA NA NA NA <br /> 06/17/03 <0 50 A <20 A <1 0 A <1 0 A <1 0 A <100 A NA NA NA <br /> 12/23/03 <0 50 A <20 A <1 0 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 /> 12/21/04 <0 50 A <20 A <1 0 A <1 0 A <1 0 A <100 A <0 50 A <0 50 A NA <br /> 03/15/05 60 A <20 A <I 0 A <1 0 A <1 0 A <100 A 0 78� A <0 50 A NA <br /> 06/21/05 12[4,6] J <20[4] J <1 0[4] J <1 0[4] J <1 0[4] J <100[4,5] J <0 50[4] J <0 50[4] J NA <br /> 09/19/05 <2 5 A <100 A <2 5 A <2 5 A <2 5 A <500 A <2 5 A <2 5 A NA <br /> 12/19/05 053 A <20 A <0 50 A <0 50 A <0 50 A 950[6,8,9] J <0 50 A <0 50 A NA <br /> 03/28/06 <0 50 A <20 A <0 50 A <0 50 A <0 50 A <300 A <0 50 A <0 50 A NA <br /> Arco_6I00_Quarterly_Data Page 6 of 9 67-KAru5 <br />