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Table 2 Fuel Oxygenates Analytical Data Former Arco Service Station#4932 16 E.Harding Way,Stockton,CA Well Date TBA MtBE; DIPE EtBE TAME 1,2-DCA EDB Number Sampled (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) MW-1 9/5100 <200 268 <2.0 <2.0 3.70 23.8 <2.0 11/2/00 <50 280 <2.0 <2.0 15 35 <2.0 315/01 <200 376 <2.00 <2.00 9.64 68.0 <2.00 518101 <1,000 1,000 <10.0 <10.0 10.3 79.4 <10.0 7120101 <200 990 <2.0 <2.0 5.8 32 <2.0 MW-2 9/5/00 215 1,420 <2.0 <2.0 4.60 7.14 <2.0 11/2/00 <2,500 3,900 <100 <100 <100 <100 <100 3/5/01 <1,000 2,860 <10.0 <10.0 <10.0 <10.0 <10.0 518/01 <4,000 2,660 <40.0 <40.0 <40.0 <40,0 <40.0 7120101 <4,000 1,900 <40 <40 <40 <40 <40 MW-3 915100 <200 5.62 <2.0 <2.0 <2.0 <2.0 <2.0 11/2/00 <50 2.90 <2.0 <2.0 <2.0 <2.0 <2.0 315/01 <200 2.64 <2.00 <2.00 <2.00 <2.00 <2.00 518101 <200 3.98 <2.0 <2.0 <2.0 <2.0 <2.0 7/20101 <200 2.2 <2.0 <2.0 <2.0 <2.0 <2.0 MW-4 915/00 <200 708,000 <2.0 Q.0 9.02 4.04 <2.0 1112/00 <10,000 350,000 <400 <400 <400 <400 <400 315101 11,600 466,000 <20.0 <20.0 537 <20.0 <20.0 518101 <500,000 500,000 <5,000 <5,000 <5,000 <5,000 <5,000 7/20101 Not sampled:0.02 ft free product present MW-5 7/20101 <200 <2.0 <2.0 <2.0 <2.0 3.8 <2.0 MW-6 7120101 <10,000 67,000 <100 <100 <100 <100 <100 MW-7 7/20101 <200 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 MW-8 7/20101 <200 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 MW-9 7120101 <200 <2.0 <2.0 <2.0 <2.0 8.4 <2.0 SV E-1 9/5100 26,100 1,140 <2.0 2.22 427 13.7 <2.0 11/2100 <250 1,200 <10 <10 <10 <10 <10 3/5101 <2,000 3,720 <20.0 <20.0 <20.0 <20.0 <20.0 5/8/01 <10,000 4,930 <100 <100 <100 <100 <100 7/20101 Not sampled:0.01 ft free product present Notes_ TBA=Tert-butyl alcohol MtBE=Methyl cert-butyl ether analyzed using EPA Method 8260A DIPE=Di-isopropyl ether EtBE=Ethyl tert-butyl ether TAME=Tert-amyl methyl ether 1,2-DCA=1,2-Dichloroethane EDB=Ethylene dbromide ppb=parts per billion <=less than given laboratory detection limit --=not measured