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' Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 3649233 <br /> 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 /> EA Engineering Science &Tech --Client Pro! ID Exxon 7-3942, 5153942 1300 Sampled 11/04/96 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript MW10 Received 11/05/96 _ <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/6020 Analyzed 11/07/96 <br /> Attention Tracy Faulkner Lab Number 9611209-07 _Reported 11f12j96 <br /> QC Batch Number GCi'107966TEX20A <br /> Instrument ID GCHP20 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br />' Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 5000 15000 <br /> Methyl t-Butyl Ether 250 N D <br /> Benzene 50 140 <br /> Toluene 50 3400 <br /> Ethyl Benzene 50 410 <br /> Xylenes (Total) 50 1600 <br /> Chromatogram Pattern Gas <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 88 <br /> 1 <br /> I <br /> Analytes reported as N D were not present above the stated llmlt of detection <br />' SEQUOIA ANALYTICAL - ELAP #1210 <br /> I <br /> Fro <br /> vin Follett <br /> lect Manager Page 7 <br /> I <br />