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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 8 t 9 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)92t 0100 <br /> Touchstone Developments Client Prod ID Chevron 9-4183 /9-4183 Sampled 04/10/96 <br /> 781 Kingston Ave Sample Descript NT-4-100 deceived 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 9604751-06 Reported 04J15/96 <br /> QC 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 mg/Kg <br /> TPPH as Gas 1 0 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 99 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> VFollett <br /> ct Manager <br /> Page 7 <br /> r� <br />