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41) Sequoia 680 Chesapeake Drlve 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 /> 4II) <br /> Analytical 819 Stryker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-0100 <br /> 1455 MCDowe11 Blvd North Ste D Petaluma CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> Gettler Ryan Geostrategies Client Pro) ID Former Unocal #5421 Sampled 04/15/98 <br /> 6747 Sierra �ourt Suite J Sample Descript UX-3-16 Received 04/16/98 <br /> Dublin, CA 94568 Matrix SOLID Extracted 04/16/98 <br /> ysisEPA <br /> Attention Clyde Galantine LablNumber h od 804A15 04 0 Analyzed 04/23/98 <br /> Reported 04f23J98 <br /> QC Batch Number MSO41698MTBEEXA <br /> Instrument ID H6 <br /> Oxygenate Compounds (EPA 8260) <br /> Analyte Detection Limit Sample Results <br /> ug/kg ug/kg <br /> Ethanol 25000 <br /> t-Butanol N D <br /> Methyl t-Butyl Ether (MTBE) 5000 N D <br /> DI-Isopropyl Ether (D1PE) 100 N D <br /> Ethyl t-Butyl Ether(ETBE) 100 N D <br /> t-Amyl Methyl Ether (TAME) 100 N D <br /> 100 N D <br /> Surrogates Control Limits % % Recovery <br /> 1,2-Dlchloroethane-d4 70 121 82 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> igory <br /> Oject Manager <br /> Page 4 <br />