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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 ( ) (Rgljw OWL) ( ) (PgN ( /L) ( ) ( ) (m ) VW-5 02/08/01 941 <200 <2 00 <2 00 <2 00 NA NA NA <10 11/06/01 33 <100 <1 0 <1 0 <1 0 NA NA NA NA 03/26/02 67 <5 0 <0 50 <0 50 <0 50 NA NA NA NA 06/21/02 16 <5 0 <0 50 <0 50 <0 50 NA NA NA NA 06/17/03 <0 50 A <20 A <10 A <10 A <10 A <100 A NA NA NA 12/23/03 <0 50 A <20 A <10 A <1 0 A <1 0 A <100 A <0 50 A <0 50 A NA 03/16/04 <0 50 A <20 A <1 0 A <1 0 A <10 A <100 A <0 50 A <0 50 A NA 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 03/15/05 60 A <20 A <1 0 A <1 0 A <1 0 A <100 A 078 A <0 50 A NA 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 VW-6 02/08/01 160 <200 <2 00 <2 00 <2 00 NA NA NA <10 11/06/01 230 <20,000 <200 <200 <200 NA NA NA NA 03/26/02 270 <50[l] <5 0[1] <5 0[1] <5 0[1] NA NA NA NA 06/21/02 330 170 <5 0 <5 0 <5 0 NA NA NA NA 09/18/02 300 270 <25 <25 <25 NA NA NA NA 12/23/02 310 <100 <10 <10 <10 NA NA NA NA 03/24/03 2,800 <20,000 <500 <500 <500 <100,000 NA NA NA 06/16/03 170 A <4,000[1,2] J <200[l] J <200[l] J <200[l] J <20,000[l] J NA NA NA 09/19/03 <250 A <10,000 A <500 A <500 A <500 A <50,000 A <250 A <250 A NA 03/16/04 170 A <4,000 A <200 A <200 A <200 A <20,000 A <100 A <100 A NA 09/07/04 <250 A <10,000 A <500 A <500 A <500 A <50,000 A <250 A <250 A NA 12/21/04 <250 A <10,000 A <500 A <500 A <500 A <50,000 A <250 A <250 A NA 03/15/05 170 A <2,000 A <100 A <100 A <100 A <10,000 A 88 A <50 A NA Arco 6100_Quarterly_Data Page 4 of 6 5-MA-W5