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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrateg ies Client Prol ID Unocal 6981, 7855 22 Sampled 12/08/97 <br /> 3164 Gold Camp Drive #240 Sample Descript MW-2 Received 12/09/97 <br /> Rancho Cordova, CA 95670 Matrix LIQUID <br /> Analysis Method EPA 8260 Analyzed 12/15/97 <br /> Attention Steve Carter Lab Number 9712694-08 Reported 12118/97 <br /> QC Batch Number MS121497MTBEF3A <br /> Instrument ID F3 <br /> Oxygenate Compounds (EPA 8260) <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> Ethanol 1700 N D <br /> t-Butanol 330 N D <br /> Methyl t-Butyl Ether (MTBE) 67 390 <br /> Di-Isopropyl Ether (DIPS) 67 N D <br /> Ethyl t-Butyl Ether (ETBE) 67 N D <br /> t-Amyl Methyl Ether(TAME) 67 N D <br /> Surrogates Control Limits% % Recovery <br /> 1,2-Dichloroethane-d4 76 114 98 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA AN LYTICAL - ELAP #1210 <br /> AmhZ <br /> Mi gory <br /> Project Manager Page 15 <br />