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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 DIVE ETBE Ethanal 1,2-DCA EDB as NO3 <br /> ID Collected ( ) ( /L) ( IL) OWL) (119/L) ( ) ( L) ( ) (m ) <br /> MW-6 06/17/03 110 A <4,000[I] J <200[l] J <200[l] J <200[l] J <20,000[l] J NA NA NA <br /> MW-8 03/15/05 <50 A <2,000 A <100 A <100 A <100 A <10,000 A 70 A <50 A NA <br /> 06/21/05 290[6] J <2,000 A <50 A <50 A <50 A <10,000 A 210 A — A NA <br /> 09/19/05 <25 A <1,000 A 29 A <25 A <25 A <5,000 A 36 A <25 A NA <br /> 12/19/05 <250 A <10,000 A <250 A <250 A <250 A <50,000 A <250 A <250 A NA <br /> 03/28/06 <250 A <10,000 A <250 A <250 A <250 A <150,000 A <250 A <250 A NA <br /> MW-9 09/19/05 <5 0 A 200 A <5 0 [7] J <5 0 A <5 0 A <1,000 A 59� A 5 1 [7] J NA <br /> 03/28/06 <5 0 A 280 A <5 0 A <5 0 A <5 0 A <3,000 A A 97 A NA <br /> MW-10 06/22/04 <120 A <5,000 A <250 A <250 A <250 A <25,000 A <120 A <120 A NA <br /> 09/07/04 <100 A <4,000 A <200 A <200 A <200 A <20,000 A <100 A <100 A NA <br /> 12/21/04 <100 A <4,000 A <200 A <200 A <200 A <20,000 A 150 A <100 A NA <br /> 03/15/05 <50 A <2,000 A <100 A <100 A <100 A <10,000 A <501 A <50 A NA <br /> 06/21/05 <50 A <2,000 A <50 A <50 A <50 A <10,000 A 130 `` A <50 A NA <br /> 09/19/05 <25 A <1,000 A 50 A <25 A <25 A <5,000 A 62 '� A <25 A NA <br /> 12/19/05 <25 A <1,000 A <25 A <25 A <25 A <5,000 A 37 A <25 A NA <br /> 03/28/06 <25 A <1,000 A <25 A <25 A <25 A <15,000 A 56 A <25 A NA <br /> i <br /> Arco_6100_Quarterly_Data Page 2 of 9 5MATV5 <br />