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Tal MM r <br /> Groundwater Analytical Res Oxygenate Compounds <br /> Tosco(Unocal)Service Station#5886 <br /> 2701 West March Lane <br /> Stockton,California <br /> I <br /> EXPLANATIONS, - <br /> Groundwater analytical data prior to March 25, 1998,were compiled from reports prepared by MPDS Services,Inc <br /> TBA=Tertiary butyl alcohol <br /> MTBE =Methyl tertiary butyl ether <br /> D1PE=Di-isopropyl ether <br /> ETBE=Ethyl tertiary butyl ether <br /> TAME=Ternary amyl methyl ether <br /> (ppb)=Parts per billion <br /> --=Not Measured/Not Analyzed <br /> ND = Not Detected <br /> I Detection limit raised Refer to analytical reports <br /> 2 Methanol by EPA Method 8015 Modified was ND <br /> 3 Laboratory report indicates sample required reanalysis past hold time due to failing internal standard on first run First analysis was within hold time <br /> Laboratory report indicates sample was originally analyzed within holding time <br /> Re-analysis for confirmation or dilution was performed past the recommended holding time <br /> s Laboratory report indicates sample was analyzed outside the EPA recommended holding time <br /> i <br /> ANALYTICAL METHOD- <br /> EPA Method 8260 for Oxygenate Compounds <br /> i <br /> i <br /> 5886 xls/#180137 23 As of 11/17/00 <br />