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4D <br /> 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 9,500 FAX (510) 988 9673 <br /> Wlir Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> i <br /> Touchstone Developments Client Prod ID Chevron 9-4183 Sampled 04/10/96 <br /> 781 Kingston Ave Sample Descript P-4-6 0 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 9604798-06 Reported 04112196 <br /> OC Batch Number GC041196BTEXEXA <br /> Instrument ID GCHP06 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> mg/Kg m9/Kg <br /> TPPH as Gas 10 N D <br /> Methyl t-Butyl Ether 0 025 N D <br /> Benzene 00050 N D <br /> Toluene 00050 N D <br /> Ethyl Benzene 00050 N D <br /> Xylenes (Total) 00050 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 98 <br />• <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 41210 <br /> Aer---- <br /> Follett <br /> ct Manager <br /> Page 7 <br />