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• <br /> Groundwater Analytical Results-Oxygenate Compounds <br /> Tosco (Unocal) Service Station#6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> Weil ID Date Methanol Ethanol TBA MTBE RIPE ETRE TAME <br /> (Ppb) (Ppb) (PPb) (Ppb) (Ppb) (Ppb) (P b) <br /> VW-3 12/08/97 <10 <500 <100 <2 0 <20 <20 <20 <br /> 03/05/98 <1,200 <250 300 <5 0 <5 0 <5 0 <br /> 05/27/98 -- <500 <100 <20 <2 0 <20 <20 <br /> 07/21/98 - <500 <100 <20 <20 <2 0 <20 <br /> 10/14/98 -- <500 <100 <2 0 <20 <2 0 <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 <5 0 <50 <50 <br /> 07/21/98 <500 170 <20 <2 0 <20 <20 <br /> 10/14/98 -- <16,500 <3,300 <66 <66 <66 <66 <br /> Trip Blank <br /> TB-LB 12108/97 <1 0 <500 <100 <20 <20 <20 <20 <br /> 03/16/98 -- <500 <100 <20 <20 <20 <2 0 <br /> 05/27/98 -- -- -_ <br /> 07/21/98 <br /> 10/14/98 <br /> I <br /> EXPLANATIONS. ANALYTICAL METHOD, <br /> TBA = Tertiary Butyl Alcohol EPA Method 8260 for Oxygenate Compounds <br /> MTBE = Methyl Tertiary Butyl Ether <br /> DIPE = 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 xlsl#180138 3 As of 10/14/98 <br />