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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> 1 404 N Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988 9673 <br /> 4W 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 08/19/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descrlpt MW5 Received 08/20/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 08/26/98 <br /> Attention Chnsta Marting Lab Number 9808C95-04 Reported 09/04/98 <br /> t <br /> C Batch Number GCO82698BTEX03A <br /> strument 1D GCHP03 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br />'Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> jTPPH as Gas 50 N D <br /> Methyl t-Butyl Ether 2 5 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 /> FSurrogates Control Limits % % Recover <br /> rlfluorotoluene 70 130 76 <br /> i <br /> I <br /> f <br /> lalytes reported as N D were not present above the stated limit of detection <br /> IEQUOIA ANALYTICAL - ELAP #1210 <br /> f <br />,* Herling <br /> Manager Page 8 <br />