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680 Chesapeake Drive 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(9Z5)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 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 /> EA Engineering Science &Tech - Client Prol ID Exxon 7-0137, 5150137 1300 Sampled 10/14/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descnpt MW-7 Received 10/16/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method B015Mod/8020 Analyzed 10/22/98 - <br /> Attention Chnsta Martmg Lab Number 981OC43-07 _ Reported 1O3of98 - <br /> C-Batch Number GC102298BTEX02A _ <br /> nstrument 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 62 <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 050 N D <br /> Toluene 0 50 N D <br /> IEthyl Benzene 050 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern <br /> Unidentified HC C6-C8 <br />' Surrogates Control Limits % % Recovery <br /> Trlfluorotoluene 70 130 121 <br /> 6 <br /> I <br /> I <br /> I <br /> knaiytes reported as N D were not present above the stated limit of detection <br /> 1EQUOIA ANALYTICAL - ELAP #1210 <br /> Ael Mel Shin <br /> ct Manager <br /> Page 7 <br />