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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 /> I <br /> Nitrate <br /> Sample Date MTBE TBA TAME DIPS ETRE Ethanol 1,2-DCA EDB as NO3 <br /> ID Collected ( IL) W21) (µLl ) (}i /L) ( ) ( /L) (µg/L) {pg/L) (mg/L) <br /> MW-6 06/17/03 110 A <4,000[l] 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 98 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 /> I <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 /> 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 <50 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 /> MW-12 06/22/04 <500 A <20,000 A <1,000 A <1,000 A <1,000 A <100,000 A <500 A <500 A NA <br /> 09/07/04 <120 A <5,000 A <250 A <250 A <250 A <25,000 A <120 A <120 A NA <br /> 12/21/04 <500 A <20,000 A <1,000 A <1,000 A <1,000 A <100,000 A <500 A <500 A NA <br /> 03/15/05 <250 A <10,000 A <500 A <500 A <500 A <50,000 A <250 A <250 A NA <br /> 06/21/05 <250 A <10,000 A <250 A <250 A <250 A <50,000 A <250 A <250 A NA <br /> 09/19/05 <100 A <4,000 A <100 A <100 A <100 A <20,000 A <100 A <100 A NA <br /> Arco_6I00_Qaarterly_Data Page 2 of 7 5TKAT'U3 <br /> I <br />