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i Ta <br /> Groundwater Analytical Res Oxygenate Compounds <br /> Chevron Service Station#9-0557 <br /> 139 South Center Street <br /> Stockton,California <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 /> 1,2-DCA= 1,2-Dichloroethane <br /> EDB= 1,2-Dibromoethane <br /> (ppb)=Parts per billion <br /> Laboratory report indicates Full Scan by EPA Method 8260 were less than the reporting limits; unless noted in table. <br /> 2 Laboratory report indicates Full Scan by EPA Method 8260 were less than the reporting limits; except for Isopropyl benzene at 39 ppb, <br /> n-Propylbenzene at 53 ppb, 1,3,5-Tri methyl benzene at 15 ppb, 1,2,4-Tri methyl benzene at 5.4 ppb,sec-Butyl benzene at 6.7 ppb, <br /> p-Isopropyltoluene at 5.5 ppb,n-Butylbenzene at 9.7 ppb,and Naphthalene at 10 ppb. <br /> Laboratory report indicates Full Scan by EPA Method 8260 were less than the reporting limits; except for Isopropyl benzene at 27 ppb. <br /> n-Propylbenzene at 55 ppb, 1,3,5-Trimethyl benzene at 180 ppb,tert-Butylbenzene at 86 ppb. 1,2,4-Tri methyl benzene at 580 ppb,and <br /> Naphthalene at 190 ppb. <br /> 9-0557.xls/ti386843 15 As of 05/16/01 <br />