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' Sequoia680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9Z33 <br /> 404 N Wiget Lane Walnut Creek.CA 94598 (510)988 9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)9Z1-9600 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 7-3942, 5153942-1300 _ Sampled 05/20/98 <br /> 3468 Mt Diablo Blvd Ste 8100 Sample Descnpt MW12 Received 05/21/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 06/02/98 <br /> Attention Chnsta Marting Lab Number 9805E41-11 Deported 06J10/98 <br />� <br /> C Batch Number GC060298BTEX17A _ -- - - -- <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 50 N D <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 050 N D <br /> Toluene 050 N D <br /> Ethyl Benzene 050 N D <br /> Xylenes (Total) <br /> 050 <br /> ND <br /> Chromatogram Pattern <br />'Surrogates Control Limits % % Recovery <br /> Trdluorotoluene 70 130 84 <br /> 1 <br /> Malyles reported as N D were not present above the stated limit of detection <br /> 1EQUOlA ANALYTICAL - ELAP #1210 <br /> rd Herling <br /> ct Manager <br /> Page 22 <br />