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i <br /> • TSE 2 • <br /> GROUNDWATER ANALYTICAL RESULTS <br /> FOR OXYGENATES AND ADDITIONAL COMPOUNDS <br /> ARCO Service Station No 5469 <br /> 130 South Wilson Way, Stockton,California <br /> USEPA U5 <br /> EPA <br /> Method 8260 Method 8015(M) <br /> Well TBA MTBE DIPE ETBE TAME 1,2-DCA EDB Ethanol Methanol <br /> Number Date <br /> NOTES <br /> g/L=micrograms per liter TBA=Tertiary butyl alcohol QA/QC Review <br /> =Below detection limit for analytical methods used MTBE=Methyl tertiary butyl ether A=Data accepted without qualification <br /> A=Not Analyzed DIPE=Di-isopropyl ether J=Data accepted with qualification <br /> SEPA w U S Environmental Protection Agency ETBE=Ethyl tertiary butyl ether R=Data rejected <br /> TAME=Tertiary amyl methyl ether <br /> [1]This sample was analyzed outside of EPA recommended hold time 12-DCA=1,2-Dichloroethane <br /> [2]The value reported exceeds the calibration curve but not the linear range EDB=Ethylene dibromide <br /> [3]The reporting limits for this sample have been raised due to the high level of a target compound <br /> [4]The reporting limits for this sample have been raised due to the high levels of non-target mterferents <br /> [5]The continuing calibration standard was outside of the acceptance criteria <br /> [6]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 Benzene,Toluene, <br /> and Ethylbenzene <br /> [71 Initial result was an estimate,beyond the calibration range of the instrument Sample re-analyzed beyond the EPA recommended hold time Initial result reported in the table <br /> [81 Initial results may be biased high as shown by surrogate recoveries above method acceptance limits(due to matrix interference) Sample re-analyzed outside of EPA recommended hold time Initial result <br /> reported in the table,and should be considered an estimate <br /> [9]The reported results may be biased low since the analyses for these analytes were performed beyond the EPA recommended holding time of 14 days <br /> [10]The reported results may be biased low as demonstrated by a low surrogate recovery due to matrix interference <br /> [III Initial result not confirmed by re-analysis Re-analysis performed beyond hold time Initial result reported in the table,should be considered an estimate <br /> [12]Initial result for 1,2-DCA confirmed by re-analysis,but re-analysis performed beyond hold time Initial result reported in the table <br /> [13]The reported result may be biased low as demonstrated by low surrogate recovery <br /> [14]Reported result may be biased high due to a high average percent recovery reported in the associated MS/MSD analysis <br /> 115]Calibration verification is within method limits but outside contract limits <br /> [161 The reported result may be biased low due to a low average percent recovery reported in the associated MSIMSD analysis <br /> [17]Ile reported result may be biased Iow,the ethanol calibration verification was within method limits but outside contract specified limits <br /> 5TRATUS <br /> Arco_5469_Quarterly_Data <br /> 11 of 11 <br /> i <br />