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Sequoia 680 Chesapeake Drive Redwood Gry 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 119 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 /> 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 Descrlpt MW-4 Received 07/22/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 07/29/98 <br /> Attention Chnsta Marting Lab Number 9807D08-04 Reported 08f03j98 <br />�QC Batch Number GC072998BTEX18A <br /> Instrument ID GCHP18 <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 0 50 N D <br /> Toluene 050 N D <br /> Ethyl Benzene 050 N D <br /> I Xylenes (Total) <br /> 0 50 N D <br /> Pattern <br /> Surrogates Control Limits % % Recovery <br /> Trlfluorotoluene 70 130 86 <br /> lnalytes reported as N D were not present above the stated limit of detection <br /> kQUOIA ANALYTICAL - ELAP #1210 <br /> f1rd Herling <br /> ct Manager Page 4 <br /> r <br />