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TABLE 4 <br /> GROUNDWATER ANALYTICAL RESULTS <br /> FOR OXYGENATES AND ADDITIONAL COMPOUNDS <br /> ARCO Smice Station No 6100 <br /> 25775 Patterson Pass Road <br /> Tracy,California <br /> I <br /> I <br /> Nitrate <br /> Sample Date MTBE TBA TAME DIPE ETBE Ethanol 1,2-DCA EDB as NO3 <br /> ID Collected /L /L /L /L /L m /L <br /> NOTES <br /> TBA=Tertiary butyl alcohol ug/L=micrograms per liter QA/QC Review <br /> TAME=Tertiary amyl methyl ether mg/L=milligrams per liter A=luta accepted without qualification <br /> DIPE=Di-isopropyl ether NA=not analyzed J=Data accepted with qualification <br /> ETBE=Ethyl tertiary butyl ether DW=Domestic Well R—Data refected <br /> 1,2-DCA= 1,2-Dtchloroethane <br /> EDB= 1,2-Dibromoethane <br /> [1]=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 ethyibenzene <br /> Arco_6100_Quarterly Data Page 4 of 4 STRATUS <br />