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9 <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 ( ) ( ) ( L) ( /L) (µ ) ( /L) ( /L) (1191L) (m ) <br /> MW-15 06/22/04 <500[3] A <20,000[3] A <1,000[3] A <1,000[3] A <1,000[3] A <100,000[3] A <500[3] A <500[3] A NA <br /> 09/07/04 <500 A <20,000 A <1,000 A <1,000 A <1,000 A <100,000 A <500 A <500 A NA <br /> VW-1 06/22/04 <1,000 A <40,000 A <2,000 A <2,000 A <2,000 A <200,000 A2 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[1] <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 /> 12/21/04 120 A <2,000 A <100 A <100 A <100 A <10,000 A <50 A <50 A NA <br /> 03/15/05 <120 A <5,000 A <250 A <250 A <250 A <25,000 A <120 A <I20 A NA <br /> 06/21/05 58[6] J <400 A <10 A <10 A <10 A <2,000 A <10 A <10 A NA <br /> 09/19/05 <5 0 A <200 A <5 0 A <5 0 A <5 0 A <1,000 A <5 0 A <5 0 A NA <br /> 03/28/06 <5 0 A <200 A <5 0 A <5 0 A <5 0 A <3,000 A <5 0 A <5 0 A NA <br /> 1 <br /> Arco_6100_Quarterly_Data Page 4 of 9 STRATUS <br />