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� 660 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988 9673 <br /> %PAnalytical $19 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0[00 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0341 <br /> ' Gettler RyaniGeostrategies Client Prol ID Unocal 5421, 140162 02 Sampled 04/16/98 <br /> ' 6747 Sierra ourt Suite J Sample Descript US-11(comp) Received 04/17/98 <br /> Dublin, CA 94568 Matrix SOLID Extracted 04/23/98 <br /> Analysis Method EPA 8260 Analyzed 04/28/98 <br /> Attention Clyde Galantine Lab Number 9804C43-01 Reported 04f30j98 <br /> OC Batch Number MSO42398MTBEEXB <br /> Instrument ID I=3 <br /> Oxygenate Compounds (EPA 8260) <br /> Analyte Detection Limit Sample Results <br /> ug/kg ug/kg <br /> Ethanol 420000 N D <br /> t-Butanol 84000 N D <br /> Methyl t-Butyl Ether (MTBE) 1700 N D <br /> Di-Isopropyl Ether (DIPS) 1700 N D <br /> Ethyl t-Butyl Ether (ETBE) 1700 N D <br /> t-Amyl Methyl Ether (TAME) 1700 N D <br /> Surrogates Control Limits% % Recovery <br /> 1,2-Dichloroethane-d4 70 121 116 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA AN LYTICAL - ELAP #1210 <br /> egory <br /> lect Manager Page 2 <br />