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4DSequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 4 404 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 Prol ID Chevron 9-4183 /9-4183 Sampled 04/10/96 <br /> 781 Kingston Ave Sample Descnpt T3-S-16 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 9604750-05 Reported 04J15J96 <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 1 0 <br /> Methyl t-Butyl Ether 0 025 N DN D <br /> Benzene 00050 <br /> Toluene 00050 N D <br /> Ethyl Benzene N D <br /> Xylenes (Total) 0 0050 N D <br /> Chromatogram Pattern 0 0050 N D <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 98 <br /> knalytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> Follett <br /> t Manager Page 6 <br />