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Sequoia 680 Chesapeake Drive Redwood City CA 9406 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget lane Walnut Creek CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> �rill7 Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Prol ID Unocal SS#0187, 280045 85 Sampled 03/09/98 <br /> 6747 Sierra Court Suite J Sample Descript U-6 Received 03/09/98 <br /> Dublin, CA 94568 Matrix LIQUID - <br /> Analysis Method EPA 8260 Analyzed 03/12/98 <br /> Attention Deanna Harding Lab Number 9803524-07 Reported 03118198 <br /> OC Batch Number MS031198MTBEH6B -- <br /> Instrument <br /> -Instrument ID H6 <br /> Oxygenate Compounds (EPA 8260) <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> Ethanol 540 N D <br /> t-Butanol 100 N D <br /> Methyl t-Butyl Ether (MTBE) 20 N D <br /> Di-Isopropyl Ether(DIPS) 20 N D <br /> Ethyl t-Butyl Ether(ETBE) 20 N D <br /> t-Amyl Methyl Ether (TAME) 20 N D <br /> Surrogates Control Limits % % Recovery <br /> 1,2-Dichloroethane-d4 76 114 93 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> Z'�/ <br /> gory <br /> Project Manager Page 3 <br />