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TABLE 2 GROUNDWATER ANALYTICAL RESULTS FOR OXYGENATES AND ADDITIONAL COMPOUNDS ARCO Service Station No. 5469 130 South Wilson Way,Stockton,California USEPA USEPA Method 8260 Method 8015(M) Well TBA MTBE DIPS ET13E TAME 1,2-DCA EDB Ethanol Methanol QA/QC Number Date !I Review MW-1 06/21/00 <200 <2 4 <2 <2 4 <2 <3,000 <1[1] 09108/00 <200 <2 <2 <2 <2 <2 <2 <3,000 <1 12/11/00 <200 <2 Q <2 <2 4 4 <3,000 <1 03/22/01 <200 2.20 <2 4 4 <2 <2 NA NA 05/24/01 400 4 4 4 <2 <2 <2 NA NA 09/14/01 <200 <2 <2 <2 <2 <2 <2 NA NA 12/14/01 <5.0 1.6 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA 02/21/02 <5.0 2.8 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA 04/23/02 <5.0 4.1 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA 09/19/02 <5.0 7.2 <0.50 <0.50 <0.50 <0.50 <0.50 <50 NA 12/11/02 <20 7.2 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA 01/14/03 QO 7.3 <0.50 <0.50 <0.50 NA NA NA NA 02/12/03 40 6.6 <0.50 <0.50 <0.50 NA NA <40 NA 02/26/03 <20 6.7 <0.50 <0.50 <0.50 <0.50 <0.50 <40 NA 05/19/03 40 7.8 <1.0 <1.0 <1.0 <0.50 <0.50 <100 NA A MW-2 06/21/00 <200 <2 <2 <2 <2 <2 <2 <3,000 <1 09/08/00 <200 <2 4 <2 <2 <2 4 <3,000 <1 12/11/00 <200 <2 <2 <2 <2 4 Q <3,000 <1 03/22/01 <200 4 4 <2 <2 <2 Q NA NA 05/24/01 <200 <2 4 4 <2 4 <2 NA NA 09/14/01 <200 d <2 <2 <2 4 <2 NA NA 12/14/01 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA 02/21/02 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA 04/23/02 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA 09/19/02 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 <050 <50 NA 12/11/02 <20 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA 01/14/03 40 <0.50 <0.50 <0.50 <0.50 NA NA NA NA 02/12/03 <20 <0.50 <0.50 <0.50 <0.50 NA NA <40 NA 02/26/03 <20 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <40 NA 05/19/03 Q0 <0.50 <1.0 <1.0 <1.0 <0.50 <0.50 <100 NA A 5IRAW5 Arco 5469 Quarterly Data 1 of 6