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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 /> 4Q7 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Blaine Tech Services Client Proj ID Chevron 9-4275/980326-G1 Sampled 03/26/98 <br /> 1680 Rogers Avenue Sample Descript Muni-10 Received 03/27/98 <br /> San Jose, CA 95112 Matrix LIQUID <br /> Analysis Method EPA 8260 Analyzed 04/01/98 <br /> Attention Fran Thie Lab Number 9803158-10 Reported 04f 12j98 <br /> QC Batch Number MSO40198MTBEF3A <br /> Instrument 1D F3 <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 N D <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 76 114 104 <br /> Analytes reported as N ere not present above the stated limit of detection <br /> SEQU AL ICAL - ELAP #1210 <br /> y nner <br /> Project Manager Page i <br />