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1 <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(6 50)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)79Z-0342 <br /> rrPla.cificr5rivirorim'ental Group ClientProject IU Unocal 0123, Tracy,J CA Sampled NIA <br /> unrise Gold Circle, Ste M Sample Descrlpt Method Blank Received NIA <br /> Rancho Cordova, CA 95742 Analysis Method EPA 5030/8260 Analyzed Oct 18, 1998 <br />' Attention Mike Mitchener Lab Number BLK101298 Reported Oct 20, 1998. <br /> OXYGENATES by GC/MS (EPA 8260) <br /> tAnalyte Reporting Limit Sample Results <br /> Vg/L. Ng/L <br />' Ethanol 500 N D <br /> Tertiary butanol 100 N D <br /> Methyl tertiary butyl ether(MTBE) 20 N D <br />' Di-isopropyl ether(DIPS) 20 N D <br /> Ethyl tertiary butyl ether(ETRE) 20 N D <br /> Tertiary amyl methyl ether(TAME) 20 N D <br />' Surrogate Control Limits, % % Recovery <br /> 1,2-Dichloroethane-d4 76-114 99 <br /> 1 <br /> 1 <br />' Analytes reported as N D were not detected at or above the reporting limit <br />' SEQU IA ANALYT CAL, ELAP #1210 <br /> nda C Sc eider <br /> roject Manager/Sacramento Laboratory <br />' S810088 PES <4> <br /> rr.� <br />