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Sequoia 680 Chesapeake Drive 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 /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Touchstone Developments Client Proj ID Chevron 9-2033, 2033-2 Sampled 10/09/96 <br /> P O Box 2554 Sample Descript OX2-11 Received 10/10/96 <br /> Santa Rosa, CA 95405 Matrix SOLID Extracted 10/14/96 <br /> Analysis Method 8015Mod/8020 Analyzed 10/14/96 <br /> Attention Jeff Monroe Lab Number 9610708-02 Reported 10J18196 <br /> QC Batch Number GC1 01 496BTEXEXA <br /> Instrument ID GCHP18 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection limit Sample Results <br /> mg/Kg mg/K9 <br /> TPPH as Gas 10 15 <br /> Methyl t-Butyl Ether 0 025 N D <br /> Benzene 00050 N D <br /> Toluene 00050 00056 <br /> Ethyl Benzene 00050 0 028 <br /> Xylenes (Total) 00050 016 <br /> Chromatogram Pattern <br /> Weathered Gas C8-C12 <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotol uene 70 130 73 <br /> • <br /> Analytes reported as N 0 were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> Ce ollett <br />'roject Manager Page 3 <br /> n°g, <br />