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- \ Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiset Lane Walnut Creek CA 94598 (510)988-9600 FAX(S 10)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)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 7-3942, 5153942 1300 Sampled 05/20/98 - <br /> 3468 Mt Diablo Blvd Ste 8100 Sample Descrlpt MW6 Received 05/21/98 " <br /> t Lafayette CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 06/02/98 <br /> Attention Chrlsta Marking Lab Number 9805E41-05 _ - _Reported 06110J98 <br /> lQC Batch Number GC060298BTEX17A A- -- _i_ ------' " " " _____.", <br /> lnstrumentID GCHP17 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> I <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> tTPPH 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) 050 N D <br /> Chromatogram Pattern <br />' Surrogates Control Limits% % Recovery <br /> Trlfluorotoluene 70 130 78 <br /> Analytes reported as N D were not present above the stated hmrt of detection <br />'SEQUOIA ANALYTICAL - ELAP #1210 <br /> Z 11—�k / <br /> Flad <br /> nHerling ` <br /> ect Manager <br /> Page 10 <br />