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Sequoia 680 Chesapeake Dave 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)921-010 0 <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 7-0137, 5150137 1300 Sampled 07/15/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descnpt MW-7 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 9807D08-07 Reported 08103/98 <br /> tC Batch Number GC072998BTEX18A <br /> strument 1D 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 50 110 <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 050 1 7 <br /> Toluene 050 N D <br /> IEthyl Benzene 050 N D <br /> Xyfenes (Total) N D <br /> Chromatogram 050 Pattern <br /> Unidentified HC C6-C8 <br /> lSurrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 75 <br /> I <br /> I <br /> nalytes reported as N ❑ were not present above the stated limit of detection <br /> 1EQUOIA ANALYTICAL - ELAP 41210 <br /> rd Herling <br /> t Manager <br /> Page 7 <br />