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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(4151 364 9233 <br /> 404 N Wiget Lane Vvalnut Creek CA 94598 (510) 988 9600 FAX(5 10) 988 9673 <br /> 14%0 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(9 16)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 Descnpt RW4 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 9608581-12 Reported 08122,196 <br /> 1 QC Batch Number GC081996BTEX02A <br /> Instrument ID GCHP02 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> tAnalyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 2500 15000 <br /> Methyl t-Butyl Ether 125 N D <br /> Benzene - 25 730 <br /> Toluene 25 2500 <br /> tEthyl Benzene 25 970 <br /> Xylenes (Total) 25 2900 <br /> Chromatogram Pattern Gas <br />' Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 83 <br /> 1 <br /> Analytes repnrieti as N D were not present above the stated limit of detection - <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> evin Follett <br /> Protect Manager <br /> Page 12 <br />