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i TABLE 2 Fuel oxygenates Analytical Data Former ARCO Service Station No 2168 441 Charter Way, Stockton,California Welt Sample 'FBA MTBE RIPE ETBE TAME 1,2-DCA Ethanol Number Date ug/L ugIL ,vg/L ugIL ugIL ug/L ug/L MW-813 8/30/2000 <200 <2 0 <2 0 <2 0 <2 0 380 NA 11/21/2000 <200 <2 0 <2 0 <2 0 <2 0 382 NA 2/15/2001 <200 <2 0 <2 0 <2 0 <2 0 436 NA 5/17/2001 <200 <2 0 <2 0 <2 0 <2 0 258 NA 8/16/2001 <200 <2 0 <2 0 <2 0 <2 0 <2 0 NA 12/6/2001 <5 0 <0 50 <0 50 <0 50 <0 50 28 NA 2/14/2002 <5 0 1 1 <0 50 <0 50 <0 50 30 NA 8/22/2002 <5 0 <0 50 <0 50 <0 50 <0 50 14 NA 11/13/2002 <20 <0 50 <0 50 <0 50 <0 50 28 NA 2/12/2003 <20 <0 50 <0 50 <0 50 <0 50 31 <40 5/29/2003 <20 <0 50 <1 0 <1 0 <1 0 is <100 814t2003 120 <0 50 <1 0 <1 0 <1 0 19 <100 MW-8C 8/30/2000 <200 <2 0 <2 0 <2 0 <2 0 <2 0 NA 11/21/2000 <200 <2 0 <2 0 <2 0 <2 0 <2 0 NA 2/15/2001 <200 <2 0 <2 0 <2 0 <2 0 <2 0 NA 5/17/2001 <200 <2 0 <2 0 <2 0 <2 0 <2 0 NA 8/16/2001 <200 <2 0 <2 0 <2 0 <2 0 <2 0 NA 12/6/2001 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 NA 2/14/2002 <5 0 13 <0 50 <0 50 <0 50 <0 50 NA 8/22/2002 <5 062 <0 50 <0 50 <0 50 <0 50 NA 11/13/2002 <20 072 <0 50 <0 50 <0 50 <0 50 NA 2/12/2003 <20 078 <0 5 <0 5 <0 5 <0 50 <40 5/29/2003 <20 085 <1 0 <1 0 <1 0 <0 50 <100 8/4!2003 <20 079 <1 0 <1 0 <1 0 <0 50 <100 Notes [1]This sample was analyzed outside of EPA recommended hold time ETBE = Ethyl tertiary butyl ether [2]The reporting limit(s)for this sample have been raised due to MTBE = Methyl tertiary butyl ether high levels of non-target interferents NA = measurement not taken < = Below detection limit for analytical methods used TAME = Tertiary amyl methyl ether 1,2-DCA = 1 2-Dichloroethane TBA = Tertiary butyl alcohol DIPS = Di-isopropyl ether ug/L = Analyhcal results in micrograms per liter Data Qualifier Definitions U The analyte was analyzed for,but was not detected above the sample reporting limit. J The analyte was positively identified the associated numerical value is the approximate concentration of the analyte in the sample N The analysis indicates the presence of an analyte for which there is presumptive evidence to make a "tentative identification" NJ The analysis indicates the presence of an analyte that has been'tentatively identified"and the associated numerical value represents its approximate concentration UJ The analyte was not detected above the reported sample reporting limit However the reported reporting limit is approximate and may or may not represent the actual limit of quantitation necessary to accurately and precisely measure the analyte in the sample R The sample results are rejected due to serious deficiencies in the ability to analyze the sample (i a the presence or absence of the analyte cannot be verified)or the analyte identification has been rejected(1 a the presence of the analyte cannot be ventied) ND Not detected above reported detection limit k MprocessU5 BP ARC010216810uarterlyl3 QTR 0312168 GWMR 3M3 5 of 5