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Sequoia 680 Chesapeake Drive Pedwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 9Bs 9600 FAX(5t0)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> r - _ - <br /> EA Engineering Science &Tech Client Prol ID Exxon 7-3942, 5153942 1300 Sampled 03/0d/98- <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript MW6 Received 03/04/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 03/17/98 <br /> Attention Christa Marting -Lab Number 9803305-05 Reported 03J31198 <br /> IiC Batch Number GC031798BTEX03A <br /> strument ID GCHP3 <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 050 N D <br /> Toluene 050 N D <br /> Benzene 050 N D <br />,Ethyl <br /> Xylenes (Total) 0 50 N D <br /> Chromatogram Pattern <br /> iSurrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 83 <br /> r <br /> r <br /> r <br /> Analytes reported as N D were not present above the stated(unit of detection <br /> JEQUOIA ANALYTICAL - ELAP #1210 <br /> rd Herling <br /> Pct Manager <br /> Page 10 <br /> r <br />