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Sequoia 680 Chesapeake Dnve 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 /> ,toAnalytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> EA Engineering Science &Tech Client Prol ID Exxon 7-3942, 5153942 1300 Sampled 08/08/96 <br /> 3468 Mt Diablo Blvd Ste 8100 Sample Descript MW4 Received 08/09/96 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 08/19/96 <br />' Attention Tracy Faulkner Lab Number 9608581-04 Reported 08122/96 <br /> QC Batch Number GC081996BTEX02A <br /> Instrument ID GCHP02 <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 50 450 <br /> Methyl t-Butyl Ether 25 74 <br /> Benzene 050 44 <br /> Toluene 050 N D <br /> Ethyl Benzene 050 52 <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern Gas <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 126 <br /> 1 <br /> 1 <br /> An4ytes reported as N D were not present above the stated limit of detection - <br /> SEO0OIA ANALYTICAL - ELAP #1210 <br /> Kevin Follett <br /> Project Manager Page 4 <br />