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660 Chesapeake Dnve Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite a Sacramento CA 95834 (9t6)921-9600 FAX(916)921 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792 0342 <br /> 19 - <br /> EA Engineering Science &Tech Client Prol ID Exxon 7-01137,-5150137 1300 Sampled 10/14/98 <br />' 3468 Mt Diablo Blvd Ste B100 Sample Descript MW-4 Received 10/16/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 10/21/98 <br /> Attention Christa Marting Lab Number 9810043-04 Reported 10130198 <br /> QC Batch Number GC102198BTEX36AlinstrumentID GCHP30 <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 N D <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 0 50 N D <br /> Toluene 050 N D <br />' Ethyl Benzene 0 50 N D <br /> Xylenes (notal) 050 N D <br /> Chromatogram Pattern <br />' Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 96 <br /> Analytes reported as N D were not present above the stated limit of detection <br />(SEQUOIA ANALYTICAL - ELAP #1210 <br /> Mel Mel Shin <br /> ct Manager <br /> Page 4 <br /> I <br />