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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 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 (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 Prof ID Exxon 7-3942, 5153942 1300 Sampled 08/19/98 <br /> 3468 Mt Diablo Blvd Ste 13100 Sample Descript lW1 Received 08/20/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 09/01/98 <br /> Attention Christa Marting Lab Number 9808C97-13 Reported 09104198 <br />[nC Batch Number GC090198BTEX21A <br /> strument 1D GCHP21 <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 250' 1600 Methyl t-Butyl Ether 12 28 <br /> Benzene 25 <br /> Toluene 2 5 12 <br /> Ethyl Benzene N D <br /> Xylenes (Total) 25 120 <br /> Chromatogram 2 5 79 Pattern GAS <br /> Surrogates Control Limits % % Recover <br /> Tnfluorotoluene 70 130 83 <br /> i0 <br /> ialytes reported as N D were not present above the stated limit of detection <br /> EQUOIA ANALYTICAL - ELAP #1210 <br /> I Herling <br /> Manager Page 8 <br />