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• i i <br /> TABLE 4 <br /> GROUNDWATER ANALYTICAL RESULTS <br /> FOR OXYGENATES AND ADDITIONAL COMPOUNDS <br /> Former ARCO Station No 6100 <br /> 25775 Patterson.Pass Road <br /> Tracy,Cahfomia <br /> Nitrate <br /> Sample Date MTBE TBA TAME DIPE ETBE Ethanol 1,2-DCA EDB as NO3 <br /> ID Collected /L IL /L m <br /> NOTES <br /> TBA=Tertiary butyl alcohol µg/L=micrograms per liter QA/QC Review <br /> AME=Tertiary amyl methyl ether mg/L=milligrams per Mer A=Data accepted without qualification <br /> DIPS=Di-isopropyl ether NA=not analyzed 3=Data accepted with qualification <br /> ETBE=Ethyl tertiary butyl ether DW=Domestic Well R=Data rejected <br /> 1,2-DCA= 1,2-Dichloroethane <br /> EDB= 1,2-Dibromoethane <br /> [l]=The sample was diluted due to the presence of high levels of non-target analytes resulting in elevated reporting limits <br /> [2]=Result may be biased low Matrix spike and matrix spike duplicate recoveries were below control limits,and the corresponding RPD was outside of control limits <br /> [3]=There was insufficient preservative to reduce the sample pH to less than 2 The sample was analyzed within 14 days of sampling,but beyond the 7 days recommended for <br /> benzene,toluene,and ethylbenzene <br /> [4]=The reported results should be considered estimated,the samples were initially analyzed within holding time but required a lesser dilution The lesser dilution was performed out of <br /> holding time <br /> [5]=The reported results may be biased low since the analyses for this analyte were performed beyond the U S EPA recommended hold time of 14 days <br /> [61=The reported result should be considered estimated due to a high relative percent difference reported between the associated LCS and LCSD <br /> [7]=The reported result may be biased high due to a high average percent recovery reported in the associated MSIMSD analysis <br /> [8]=The reported result should be considered estimated because the associated continuing calibration standard was outside of acceptance criteria <br /> [91=The reported result may be biased high due to a high average percent recovery reported in the associated LCS/LCSD analysis <br /> I <br /> Arco_6IOLQuarterly_Data Page 8 of 8 5TRATU5 <br />