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Sequoia 680 Chesapeake Drtve Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N 1,11get Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> la Gettler Ryan/Geostrategies —- Client Prol ID ---Tosco-SS#6981,-189138 85 Sampled 05/27/98 <br /> 6747 Sierra Court Suite J Sample Descnpt MW-1 Received 05/28/98 <br /> 5 Dublin, CA 94568 Matrix LIQUID <br /> Analysis Method EPA 8260 Analyzed 06/01/98 <br /> Attention Deanna Harding _ _ Lab Number 9805H47-02 Reported 07J24198 <br /> QC Batch Number MS060198MTBEF2A <br /> Instrument ID F2 <br /> Oxygenate Compounds (EPA 8260) <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> Ethanol 500 N D <br /> t-Butanol 100 N D <br /> Methyl t-Butyl Ether (MTBE) 20 30 <br /> Di-Isopropyl Ether (DIPE) 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 84 <br /> 0 <br /> Analytes reported as N 0 were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 41210 <br /> llllllllllllllllllllGiranccher <br /> Pr lect Manager Page 2 <br />