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TAP 2 k GROUNDWATER ANALYTICAL RESULTS F FOR OXYGENATES AND ADDITIONAL COMPOUNDS i ARCO Service Station No. 5469 130 South Wilson Way, Stockton, California USEPA USEPA Method 8260 Method 8015 (M) Well TBA MTBE DIPE ETBE TAME 1,2-DCA EDB Ethanol Methanol Number Date n/L µg/L µg/L µg/L µg/L µg/L pg/1- n/L gg/L MW-5 06/21/00 259 8,370 <2 <2 7.46 <2 <2 <3,000 <1 09/08/00 357 10,300 <2 <2 10.4 <2 <2 <3,000 1.17 12/11/00 245 12,100[2] <2 <2 13.1 <2 <2 <3,000 <1 03/22/01 <200 15,600 [3] <2 [4] <2 [4] <2 [4] <2 [4] <2 [4] NA NA 05/24/01 <1000[4] 14,400 <10[4] <10[4] <10[4] <10[4] <10[4] NA NA 09/14/01 <2,000 16,000 <20 <20 <20 <20 <20 NA NA 12/14/01 <50 12,000 <5.0 <5.0 14 <5.0 <5.0 NA NA 02/21/02 <1,000[3] 13,000 <100[3] <100[3] <100[3] <100[3] <100[3] NA NA 04/23/02 <5,00013] 7,600[3] <500[3] <500[3] <500[3] <500[3] <50013] NA NA 09/19/02 <500 4,600 <50 <50 <50 <50 <50 <5,000 NA 12/11/02 <1,000 3,800 <25 <25 <25 <25 <25 NA NA MW-6 06/21/00 <200 4,120 <2 4.1 4.64 <2 <2 <3,000 <1 09/08/00 <200 6,690 <2 5.0 8.1 <2 <2 <3,000 1.08 12/11/00 <200 7,060 [2] <2 3.08 9.28 <2 <2 <3,000 <1 03/22/01 <200 <2,000[4] <20 [4] <20 [4] <20 [4] <20 [4] <20[4] NA NA 05/24/01 241 16,100 <2 4.47 21.1 <2 <2 NA NA 09/14/01 <2,000 22,000 <20 <20 22 <20 <20 NA NA 12/14/01 <50 14,000 <5.0 <5.0 17 <5.0 <5.0 NA NA 02/21/02 <5,000[3] 45,000 <500[3] <500[3] <500[3] <500[3] <500[3] NA NA 04/23/02 <5,000[3] 50,000[3] <500[3] <500[3] <500[3] <500[3] <500[3] NA NA 09/19/02 590 69,000 <50 <50 110 <50 <50 <5,000 NA 12/11/02 <40,000 85,000 <1,000 <1,000 <1,000 <1,000 <1,000 NA NA I I STRAT05 Arco_5469_Quarter1y_Data 3of6