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1 <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(92S)988-9673 <br /> 019 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1111W Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)79Z-1865 FAX(707)792-0342 <br /> TC Associates, Inc Client Prot ID Ripon Unified School Sampled 09/21/98 <br /> 1260 Graphics Drive Sample Descrlpt RVSD-SB8-20 0 Received 09/22/98 <br /> Modesto, CA 95351-1502 Matrix SOLID Extracted 09/25/98 <br /> = Analysis Method EPA 8260 Analyzed 09/26/98 <br /> ttentlon Drew Van Allen Lab Number 9809E04-02 Reported 09130J98 <br /> C.Batch Number Mt092598MTBEEXA <br /> fstrun en I <br /> D F22 <br /> Oxygenate Compounds (EPA 8260) <br />'Analyte Detection Limit Sample Results <br /> ug/k9 ug/kg <br /> Ethanol 25000 N D <br /> -Butanol 5000 N D <br /> Methyl t-Butyl Ether (MTBE) 100 N D <br /> Di-Isopropyl Ether(DIPS) 100 N D <br /> I <br /> Ethyl t-Butyl Ether (ETBE) 100 N D <br /> t-Amyl Methyl Ether (TAME) 100 N D <br /> 1Surrogates Control Limits % % Recovery <br /> 1,2-Dichloroethane-d4 70 121 88 <br /> b <br /> I <br /> I <br /> I <br />(alytes reported as N D were not present above the stated limit of detection <br /> EQUOIA ANALYTICAL - ELAP 01210 <br /> rolec anager Page 3 <br />