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T,*2 <br /> • Groundwater Analytical Results -Oxygenate Compounds r <br /> Tosco (Unocal) Service Station#6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> Well ID Date Methanol Ethanol TBA MTBE DIPS ETRE TAME <br /> VW-1 12/08/97 <1 0 <500 <t00 <20 <20 <20 <20 <br /> 03/05/98 - <500 <100 <20 <20 <20 <20 <br /> 05/27/98 <500 <100 <20 <2 0 <2 0 <20 <br /> VW-3 12/08/97 <1 0 <500 <100 <20 <2 0 <2 0 <20 <br /> 03105/98 - <1,200 <250 300 <50 <5 0 <5 0 <br /> 05/27/98 <500 <100 <20 <20 <20 <2 0 <br /> VW-4 12/08/97 WELL CONNECTED TO'VES -- -- -- -- -- <br /> 03/05/98 <500 <100 39 <20 <20 <20 <br /> 05/27/98 <1,250 <250 <50 <50 <50 <50 <br /> Trip Blank <br /> TB-LB 12108/97 <10 <500 <100 <20 <20 <br /> <2 0 <2 0 <br /> 03/16/98 - <500 <100 <20 <20 <20 <20 <br /> 05/27/98 -- — — -- -- -- <br /> EXPLANA11ONS. ANALYTICAL METHOD, <br /> TSA = Tertiary Butyl Alcohol EPA Method 8260 for Oxygenate Compounds <br /> MTBE = Methyl Tertiary Butyl Ether <br /> DIPS = Di-isopropyl Ether <br /> ETBE = Ethyl Tertiary Butyl Ether <br /> TAME = Tertiary Amyl Methyl Ether <br /> ppb = Parts per billion <br /> -- = Not Analyzed <br /> 6981 xls/#180138 2 As of 05/27/98 <br />