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Sequoia680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510)968 9600 FAX(510)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)9Z[ 9600 FAX(916)921 0100 <br /> 6 Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707) 792-1865 FAX(707)792 0342 <br /> EA Engineering Science &Tech Client Prol ID Exxon, 7-0137, 5150137 1300 Sampled 04/15/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript MW6 Received 04/17/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 04/23/98 <br /> Attention Chrlsta Marting Lab Number 9804C34-06 _ _ Reported 04j27198 <br /> QC Batch Number GC042398BTEX21A <br /> Instrument ID GCHP21 <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 050 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern <br />' Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 108 <br /> Analytes reported as N 0 were not present above the stated limit of detection <br />'SEQUOIA ANALYTICAL - ELAP #1210 <br />! �L <br /> and Herling <br /> jject <br /> Manager Page 6 <br />