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TABLE 4 GROUNDWATER ANALYTICAL RESULTS FOR OXYGENATES AND ADDITIONAL COMPOUNDS ARCO Service Station No 6100 25775 Patterson Pass Road Tracy,California Nitrate Sample Date MTBE TBA TAME DIPE ETBE Ethanol 1,2-DCA EDB as NO3 ID Collected ( ) ( ) ( ) ( ) ( ) ( ) (pg/L} W/O (m ) MW-6 06/17/03 110 A <4,000[l] J <200[1] J <200[l] J <200[l] J <20,000[l] J NA NA NA MW-8 03/15/05 <50 A <2,000 A <100 A <100 A <100 A <10,000 A 70 A <50 A NA 06/21/05 290[6] J <2,000 A <50 A <50 A <50 A <10,000 A 210 A 98 A NA MW-10 06/22/04 <120 A <5,000 A <250 A <250 A <250 A <25,000 A <120 A <120 A NA 09/07/04 <100 A <4,000 A <200 A <200 A <200 A <20,000 A <100 A <100 A NA 12/21/04 <100 A <4,000 A <200 A <200 A <200 A <20,000 A 150 A <100 A NA 03/15/05 <50 A <2,000 A <100 A <100 A <100 A <10,000 A <50 A <50 A NA 06/21/05 <50 A <2,000 A <50 A <50 A <50 A <10,000 A 130 A <50 A NA MW-12 06122104 <500 A <20,000 A <1,000 A <1,000 A <1,000 A <100,000 A <500 A <500 A NA 09/07/04 <120 A <5,000 A <250 A <250 A <250 A <25,000 A <120 A <120 A NA 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 03/15/05 <250 A <10,000 A <500 A <500 A <500 A <50,000 A <250 A <250 A NA 06/21/05 <250 A <10,000 A <250 A <250 A <250 A <50,000 A <250 A <250 A NA MW-13 06/22/04 <2 5 A <100 A <5 0 A <5 0 A <5 0 A <500 A <2 5 A <2 5 A NA 09/07/04 <2 5 A <100 A <5 0 A <5 0 A <5 0 A <500 A <2 5 A <2 5 A NA 12/21/04 <2 5 A <100 A <5 0 A <5 0 A <5 0 A <500 A 52 A <2 5 A NA 03/15/05 <5 0 A <200 A <10 A <10 A <10 A <1,000 A <5 0 A <5 0 A NA 06/21/05 <0 50 A <20 A <0 50 A <0 50 A <0 50 A <100 A 070 A <0 50 A NA 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 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 Arco_6100_Quarterly_Data Page 2 of 6 51'Karu5