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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 (925)988-9600 FAX(9Z5)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-9865 FAX(707)792-0342 <br /> 1 <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 MW4 Received 11/19/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 11/27/98 <br /> Attention Chrlsta Marting Lab Number 9811D70-03 _ Reported 12J03J98 <br />' QC Batch Number GC112798BTEX02A <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 50 770 <br /> Methyl t-Butyl Ether 25 15 <br /> Benzene 050 N D <br /> Toluene 0 50 1 4 <br />' Ethyl Benzene 0 50 5 4 <br /> Xylenes (Total) <br /> Pattern 0 50 N D <br /> Gas & Unidentified HC C6-C12 <br /> Surrogates Control Limits % % Recovery <br /> Trlfluorotoluene 70 130 1790 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> ei Mel Shin <br /> sect Manager Page 3 <br />