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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N W9get Lane Walnut Creels 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 Prol ID Exxon 7-3942, 51539 42 1300 Sampled 08/26/97 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript P2 Received 08/27/97 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 08/30/97 <br /> Attention Christa Marting Lab Number 970SE45-18 Reported 09104197 <br /> QC Batch Number- GC083097BTEX07A <br /> Instrument ID GCHP07 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Anafyte Detection Limit Sample Results <br /> ug/L ug/L <br />■ TPPH as Gas 200 1500 <br /> f Methyl t-Butyl Ether 10 11 <br /> Benzene 2 0 17 <br /> Toluene 20 N D <br /> IEthyl Benzene 20 25 <br /> Xylenes (Total) 2 0 26 <br /> Chromatogram Pattern Gas <br /> Surrogates Control Limits% % Recovery <br /> Trifluorotoluene 70 130 78 <br /> I <br /> Analytes reported as N D were not present above the stated limit of detection <br /> k1QUOIA ANALYTICAL - ELAP #1210 <br /> 3Herling <br />�r t r tManager Page 14 <br />