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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)988-9(573 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)92t-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1 <br /> EA Engineering Science &Tech Client Prol ID Exxon 7-0137, 5150137 1300 Sampled 07/15/98 <br />' 3468 Mt Diablo Blvd Ste B100 Sample Descript MW-3 Received 07/22/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 07/28/98 <br /> Attention Chnsta Marting Lab Number 9807D08-03 Reported 08J03/98 <br /> l <br /> QC Batch Number GC072898BTEX22A <br /> Instrument ID GCHP22 <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 53 <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) <br /> 050 <br /> ND <br /> Chromatogram Pattern <br /> Surrogates Control Limits % % Recovery <br /> Tnfluorotoluene 70 130 112 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> EQUOIA ANALYTICAL - ELAP #1210 <br /> t',d Herling <br /> ct Manager <br /> Page 3 <br />