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TABLE 4 GROUNDWATER ANALYTICAL.RESULTS FOR OXYGENATES AND ADDITIONAL COMPOUNDS Former ARCO 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 ( L) ()Ag/L} (Ag/L} (µg/L) W/O (Ag/L} (Ag/L} ( IL,) (m /L) VW-3 02/08/01 1,000 387 570 <2 00 <2 00 NA NA NA <1 0 03/26/02 490 <100[l] <10[1] <10[1] <10[1] NA NA NA NA 03/16/04 180 A <2,000 A <100 A <100 A <100 A <10,000 A <50 A <50 A NA 06/22/04 970 A <20,000 A <1,000 A <1,000 A <1,000 A <100,000 A <500 A <500 A NA 09/07/04 360 A <4,000 A <200 A <200 A <200 A <20,000 A <210 A <100 A NA 12/21/04 170 A <2,000 A <100 A <100 A <100 A <10,000 A <50 A <50 A NA 03/15/05 <50 A <2,000 A <100 A <100 A <100 A <10,000 A <50 A <50 A NA 06/21/05 180[6] J <1,000 A <25 A <25 A <25 A <5,000 A 100 A 37 A NA 09/19/05 120 A <2,000 A <50 A <50 A <50 A <10,000 A <50 A <50 A NA VW-4 02/08/01 1,890 <20,000 <200 <200 <200 NA NA NA <10 09/18/02 1,200 <2,500 <250 <250 <250 NA NA NA NA 06/22/04 <250 A <10,000 A <500 A <500 A <500 A <50,000 A 960 A <250 A NA 06/21/05 <500 A <20,000 A <500 A <500 A <500 A <100,000 A 970 A <500 A NA VW-5 02/08/01 941 <200 <2 00 <2 00 <2 00 NA NA NA <1 0 11/06/01 3 3 <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 <1 0 A <1 0 A <1 0 A <100 A NA NA NA 12/23/03 <0 50 A <20 A <1 0 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 <1 0 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[41 J <1 0[41 J <100[4,5] J <0 5014] J <0 50[4] J NA 09/19/05 <2 5 A <100 A <2 5 A <2 5 A <2 5 A <500 A <2 5 A <2 5 A NA Areo_6I00_Quarter1y_Data Page 4 of 7 STRAW5