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92 <br /> Fuel Oxygenates Analytical Data <br /> ARCO Service Station No.5450 <br /> 1617 West Fremont Street,Stockton,California <br /> Well Date TBA MtBE DIPE EtBE TAME 1,24DCA EDB Ethanol <br /> Number Sampled L L L L) L L I- <br /> MW-2 9/11/2002 <20 62 <0.5 <0.5 <0.5 <0.5 <0.5 <40 <br /> 11/27/2002 <20 43 <0.5 <0.5 <0.5 <0.5 <0.5 - <br /> 3/14/2003 <20 28 <0.5 <0.5 <0.5 <0.5 <0.5 -- <br /> 4/24/2003 <20 30 <1.0 <1.0 <1.0 <0.5 <0.5 <100 <br /> 8/14/2003 <20 18 <1.0 <1.0 <1.0 <0.5 <0.5 <100 <br /> 11/6/2003 <100 36 <5.0 <5.0 <5.0 <2.5 <2.5 <500 <br /> MW-3 9/11/2002 <20 0.77 <0.5 <0.5 <0.5 <0.5 <0.5 <40 <br /> 11/27/2002 <20 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 -- <br /> 3/14/2003 <20 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 -- <br /> 4/24/2003 <20 <0.5 <1.0 <1.0 <1.0 <0.5 <0.5 <100 <br /> 8/14/2003 <20 <0.5 <1.0 X1.0 <1.0 <0.5 <0.5 <100 <br /> 11/6/2003 <20 <0.5 <1.0 <1.0 <1.0 <0.5 <0.5 <100 <br /> MW-4 9/11/2002 <20 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <40 <br /> 11127/2002 <20 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 - <br /> 3/14/2003 <20 0.69 <0.5 <0.5 <0.5 <0.5 <0.5 -- <br /> 4/24/2003 <20 0.66 <1.0 <1.0 <1.0 <0.5 <0.5 <100 <br /> 8/14/2003 <20 1.5 <1.0 <1.0 <1.0 <0.5 <0.5 <100 <br /> 11/6/2003 <20 1.4 <1.0 <1.0 <1.0 <0.5 <0.5 <100 <br /> Notes: <br /> < = below given laboratory detection limit EDB = Ethylene dibromide TAME = Tert-amyl methyl ether <br /> 1,2-DCA = 1,2-Dichloroethane ELBE = Ethyl tert-butyl ether TBA = Tert-butyl alcohol <br /> DIPE = Di-isopropyl ether MtBE = Methyl tert-butyl ether ugIL = micrograms per liter <br /> =Not analyzed or measured <br /> Data Qualifier Definitions: <br /> U The analyte was analyzed for,but was not detected above the sample reporting limit. <br /> J The analyte was positively identified;the associated numerical value is the approximate concentration of the analyte in the sample. <br /> N The analysis indicates the presence of an analyte for which there is presumptive evidence to make a"tentative identification." <br /> NJ The analysis indicates the presence of an analyte that has been"tentatively identified"and the associated numerical value represents its approximate <br /> concentration. <br /> UJ The analyte was not detected above the reported sample reporting limit. However,the reported reporting limit is approximate and may or may not <br /> represent the actual limit of quantitation necessary to accurately and precisely measure the analyte in the sample. <br /> R The sample results are rejected due to identification or other analytical issues. <br /> ND Not detected above reported detection limit <br /> K:SWprocesSQ5 BP ARM05450%QuarterlyW QTR 0315450 GWMR 4003 <br />