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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9Z33 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)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 /> s <br /> EA Engineering Science&Tech Client Prod ID Exxon 7-0137, 5150137 1300 _ Sampled 10/14/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descnpt MW-5 Received 10/15/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 10/22/98 <br /> Attention Chnsta Marting Lab Number 9810C43-06 Reported 10/30/98 N <br /> C Batch Number GC1022988TEX17A _ <br /> nstrument ID GCHP17 <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 <br /> 50 N D <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 050 N D <br /> Toluene 0 50 N D <br />' Ethyl Benzene 050 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 102 <br /> 6 <br /> 1 <br /> lnalytes reported as N D were not present above the stated limit of detection <br />[EQUOIA ANALYTICAL - ELAP #1210 <br /> v1 Mei Shin <br /> ct Manager <br /> Page 6 <br />