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Sequoia 680 Chesapeake Dnve Redwood City, CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 1WAnalytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 0 <br /> Touchstone Developments Client Prol ID Chevron 9-2033, 2033-2 Sampled 10/17/96 <br /> P O Box 2554 Sample Descript A9 Received 10/18/96 <br /> Santa Rosa, CA 95405 Matrix SOLID Extracted 10/21/96 <br /> Analysis Method 8015Mod/8020 Analyzed 10/21/96 <br /> Attention Jeff Monroe Lab Number 9610827-05 Reported 10/22196 <br /> OC Batch Number GC102196BTEXEXA <br /> instrument ID GCHP06 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> mg/Kg mg/Kg <br /> TPPH as Gas 1 0 27 <br /> Methyl t-Butyl Ether 0 025 N D <br /> Benzene 00050 N D <br /> Toluene 00050 00063 <br /> Ethyl Benzene 00050 00086 <br /> Xylenes (Total) 00050 0 046 <br /> Chromatogram Pattern <br /> Unidentified HC C8-C12 <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 93 <br /> 0 <br /> analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> JiVollett <br />'roject Manager Page 5 <br />