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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 MO) 988 9600 FAX(5101 988 9673 <br /> X117 Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 %00 FAX (916) 921 0100 <br /> Touchstone Developments Client Prof ID Chevron 9-4183 /9-4183 Sampled 04/10/96 <br /> 781 Kingston Ave Sample Descript SP-1(A-D) Received 04/10/96 <br /> Oakland, CA 94611 Matrix SOLID Extracted 04/15/96 <br /> Analysis Method 8015Mod/8020 Analyzed 04/15/96 <br /> Attention Robert Mallory Lab Number 9604898-01 Reported 04J19196 <br /> QC Batch Number GC041596BTEXEXA <br /> Instrument ID GCHP18 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> mg/K9 mg/Kg <br /> TPPH as Gas 10 34 <br /> Methyl t-Butyl Ether 025 14 <br /> Benzene 0 050 N D <br /> Toluene 0 050 N D <br /> Ethyl Benzene 0 050 N D <br /> Xylenes (Total) 0 050 030 <br /> Chromatogram Pattern <br /> Weathered Gas C8-C12 <br /> Surrogates Control Limits % % Recovery <br /> Tnfluorotoluene 70 130 97 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - FLAP 41210 <br /> Follett <br /> ct Manager Page 2 <br />