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CAMBRIA <br /> Table 1 Fuel Oxygenates Historical Data,Shell-branded Service Station,6131 Pacific Avenue, Stockton California ✓ <br /> Sample Date Ethanol Methanol TBA MTBE DIPE ETBE TAME <br /> (Ug/1) (ug/1) (Ug/1) (Ug/1) (Ug/1) (ug/1) (ugf I) <br /> VEW-2 23-Nov-98 NA NA <10,000 <200 <200 <200 <200 <br /> VEW-2 24-Feb-99 <150,000 <10,000 <10,000 <100 <100 <100 <100 <br /> VEW-2 13-May-99 <62,500 <1,000 <12,500 <125 <125 <125 <125 <br /> VFW-2 20-Aug-99 <20,000 <1 000 <4,000 636 <40 0 <40 0 <40 0 <br /> VEW-2 16-Aug-00 NA NA <400 228 <20 0 <20 0 <20 0 <br /> Abbreviations and Notes, <br /> Ethanol by EPA Method 8260 <br /> Methanol by CPA 8015(Modified) <br /> TBA=Tertiary butyl alcohol by EPA 8260 <br /> M1 BE=Methyl tertiary butyl ether by EPA 8260 <br /> DIPE=Di-isopropyl ether by EPA 8260 <br /> ETBE—Ethyl tertiary butyl ether by EPA 8260 <br /> TAME=Tertiary amyl methyl ether by EPA 8260 <br /> ug/1=micrograms per liter,parts per billion(ppb) <br /> NA=Not analy Eed for this parameter <br /> <x=Not detecte d at detection limit of x <br /> 0854 Page 4 of 4 <br />