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+ 6) Sequoia 680 Chesapeake Drive Redwood Cory,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 iii Woget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> low Analytical 819 Striker Avenue,Swte 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921-0100 <br /> Gettler Ryan Geostrategles _ Client Prol-IDi Unocal SS#5886 - _ Sampled 03/25/98 <br /> 1 6747 Sierra Court Suite J Sample Descrlpt MW-6S Received 03/25/98 - <br /> Dublin, CA 94568 Matrix LIQUID - <br /> Analysis Method EPA 8260 Analyzed 04/01/98 <br /> Attention Deanna Harding Lab Number 9803G82-10 _ _ Reported 04108198 <br /> QC Batch Number MS033198MTBEF3A - - <br /> Instrument ID F3 <br /> Oxygenate Compounds (EPA 8260) <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> Ethanol 8400 N D <br /> t-Butanof 1700 N D <br /> Methyl t-Butyl Ether (MTBE) 33 1600 <br /> DI-Isopropyl Ether(DIPE) 33 N D <br /> Ethyl t-Butyl Ether (ETBE) 33 N D <br /> t-Amyl Methyl Ether (TAME) 33 N D <br /> Surrogates Control Limits % % Recovery <br /> 1,2-Dichloroethane-d4 76 114 100 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 01210 <br /> gory <br /> Pr Manager Page 26 <br />