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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 /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Blaine Tech Services Client Prol ID Chevron 9-8632/980212-C1 Sampled 02/12/98 <br /> 1680 Rogers Avenue Sample Descript SUMP Received 02/13/98 <br /> San Jose, CA 95112 Matrix LIQUID <br /> Analysis Method EPA 8020 Analyzed 02/25/98 <br /> Attention Fran Thie Lab Number 9802902-05 Reported 03/02198 <br /> QC Batch Number GCO22598BTEXo7A <br /> Instrument ID GCHP7 <br /> Methyl t-Butyl Ether (MTBE) <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L. <br /> Methyl t-Butyl Ether 25 64 <br /> Surrogates Control Limits % % Recovery <br /> Tri#luorotoluene 70 130 90 <br />• <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA L AL - ELAP #1210 <br /> Peggy Penne <br /> P ct Manager Page 11 <br />