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. Tab* <br /> Groundwater Analytical Results-Oxygenate Compounds <br /> Tocso(Former BP)Service Station#11192 <br /> 1403 Country Club Boulevard <br /> Stockton,California <br /> WELL ID DATE METHANOL ETHANOL TBA MTBE DIPE ETRE TAME 1 2-DCA EDB <br /> (ppb) (ppb) (Ppb) (Ppb) (ppb) (ppb) (ppb) (ppb) (ppb) <br /> MW-10 08/16/01 <1,000 <500 <20 <2 0 <20 <2 0 <2 0 <2 0 <2 0 <br /> 11/09/01 -- <500 <20 <10 <10 <10 <10 <10 <10 <br /> 02/18/02 -- <500 <100 <2 0 <2.0 <2 0 <2 0 <2 0 <2 0 <br /> MW-11 08/16/01 <1,000 <500 <20 110 <2 0 <2 0 <2 0 <2 0 <2 0 <br /> 10/04/01 <500 <500 <20 200 <2 0 <20 <2 0 14 <20 <br /> 11/09/01 -- <500 160 140 <10 <10 <10 16 <10 <br /> 02/18/02 <1,000 <200 310 <4 0 <4 0 <4 0 13 <4 0 <br /> EXPLANATIONS ANALYTICAL METHODS <br /> TBA=Tertiary butyl alcohol EPA Method 8260 for Oxygenate Compounds <br /> MTBE=Methyl tertiary butyl ether EPA Method 8015(Modified)for Methanol <br /> D1PE=Di-isopropyl ether <br /> ETRE=Ethyl tertiary butyl ether <br /> TAME=Tertiary amyl methyl ether <br /> 1,2-DCA= 1,2-Dichloroethane <br /> EDB= 1,2-Dibromoethane <br /> (ppb)=Parts per billion <br /> --=Not Analyzed <br /> 11192 xlsl#180288 6 As of 02/18/02 <br />