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I F . _ TAW 2 GROUNDWATER ANALYTICAL RESULTS FOR OXYGENATES AND ADDITIONAL COMPOUNDS ARCO Service Station No. 5469 130 South Wilson Vinay,Stockton,California USEPA CJSEPA Method 8260 Method 8015(M) Well TBA MTBE DIPE ETBE TAME 1,2-DCA EDB Ethanol Methanol Number Date µg/L µg/L µg/L 1tg/L µg/L jig/l, µg/L µg/l, µg/L MW-3 06/21/00 <200 19.2 <2 <2 <2 <2 <2 <3,000 <1 09/08/00 <200 2.58 <2 <2 <2 <2 <2 <3,000 <1 12/11/00 <200 3.60 <2 <2 <2 <2 <2 <3,000 <1 03/22/01 <200 <2 <2 <2 <2 <2 <2 NA NA 05/24/01 <200 <2 <2 <2 <2 <2 <2 NA NA 09/14/01 <200 <2 <2 <2 <2 <2 <2 NA NA 12/14/01 <5.0 0.56 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA 02/21/02 <5.0 2.1 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA 04/23/02 <5.0 1.1 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA 09/19/02 <5.0 2.3 <0.50 <0.50 <0.50 <0.50 <0.50 <50 NA 12/11/02 <20 2.1 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA 01/14/03 <20 2.0 <0.50 <0.50 <0.50 NA NA NA NA 02/12/03 <20 1.4 <0.50 <0.50 <0.50 NA NA <40 NA 02/26/03 <20 1.6 <0.50 <0.50 <0.50 <0.50 <0.50 <40 NA MW-4 06/21/00 <200 2,290 <2 <2 <2 <2 <2 <3,000 4.81 09/08/00 <200 1,220 <2 <2 <2 <2 <2 <3,000 <L 12/11/00 <200 3,230 <2 <2 <2 <2 <2 <3,000 <1 03/22/01 <200 5,100[2] <2 <2 <2 <2 <2 NA NA 05/24/01 <200 5,610 <2 <2 <2 <2 <2 NA NA 09/14/01 <2,000[4] 24,000 <20[4] <20[4] <20[4] <20[4] <20[4] NA NA 12/14/01 <250 25,000 <25 <25 <25 <25 <25 NA NA 02/21/02 <1,200[3] 29,000 <120[3] <120[3] <120[3] <120[3] <120[3] NA NA 04/23/02 <5,000[3] 17,000[3] <500[3] <500[3] <500[3] <500[3] <500[3] NA NA 09/19/02 <250 17,000 <25 <25 <25 <25 <25 <2,500 NA 12/11/02 <10,000 21,000 <250 <250 <250 <250 <250 NA NA 01/14/03 <10,000 13,000 <250 <250 <250 NA NA NA NA 4 02/12/03 <101000 18,000 <250 <250 <250 NA NA <20,000 NA 02/26/03 <20,000 4,000 <500 <500 <500 <500 <500 <40,000 NA 5rKATU.5 Arco_5469_Quarter1y_Data 2of6