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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiset Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> wI,r Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> 106 <br /> Touchstone Developments Client Prof ID Chevron 9-4183 Sampled 04/10/96 <br /> 781 Kingston Ave Sample Descript T4-E-9 5 Received 04/10/96 <br /> Oakland, CA 94611 Matrix SOLID Extracted 04/11/96 <br /> Analysis Method 8015Mod/8020 Analyzed 04/11/96 <br /> Attention Robert Mallory Lab Number 9604798-01 Reported 04112J96 <br /> OC Batch Number GC041196BTEXEXA <br /> Instrument ID GCHP18 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> mg/K9 mg/K9 <br /> TPPH as Gas 400 660 <br /> Methyl t-Butyl Ether 10 N D <br /> Benzene 20 2 7 <br /> Toluene 2 0 17 <br /> Ethyl Benzene 2 0 60 <br /> Xylenes (Total) 2 0 0 <br /> Chromatogram Pattern <br /> Weathered Gas **** <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 97 <br /> analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br />*Fol I ett <br /> ct Manager Page 2 <br />