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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N Wiget lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Stoker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921 0100 <br />' 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792 1865 FAX(707)792-034Z <br /> EA Engineering Science &Tech Client Prol ID Exxon 7-3942, 5153942 1300 Sampled 11/18/98 <br />' 3468 Mt Diablo Blvd Ste B100 Sample Descript IW1 Received 11/19/98 <br /> Lafayet-s, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 11/27/98 - <br /> Attention Christa Marting Lab Number 9811D70-11 Reported 12103198 " <br /> QC Batch Number GC1 12798BTEX1 7A <br /> Instrument ID GCHP17 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> ug/L tag/L <br /> TPPH as Gas 500 1300 <br /> Methyl t-Butyl Ether 25 26 <br /> Benzene 50 16 <br /> Toluene 50 N D <br /> Ethyl Benzene 5 0 78 <br /> Xylenes (Total) 50 40 <br /> Chromatogram Pattern GAS <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 98 <br /> i <br /> I <br /> Analytes reported as N 0 were not present above the stated limit of detection <br /> ISEQUOIA ANALYTICAL - ELAP #1210 <br /> ei Mei Shin <br /> lect Manager <br /> Page 11 <br />