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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> y 404 N Wiger Lane Walnut Creek CA 94598 (925)9a8-9600 FAX(925)988 9673 <br /> Analytical 819 Striker Avenue Suue 8 Sacramento CA 95834 (916)921 9600 FAX(916)92]-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma, CA 94954 (707)792-1865 FAX(707)792-0342 <br /> EA Engineering Science &Tech Client Prod ID Exxon 7-0137, 5150137 1300 Sampled 07/15/98 <br /> 3468 Mt Diablo Blvd Ste 8100 Sample Descrlpt MW-5 Received 07/22/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 07/29/98 <br /> Attention Chrlsta Marting Lab Number 9807D08-05 Reported 08j03/98 <br /> UC Batch Number GC072998BTEX18A <br /> nstrument 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 97 <br /> Methyl t-Butyl Ether 25 11 <br /> Benzene 050 26 <br /> Toluene 050 N D <br /> Ethyl Benzene 050 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern <br /> Unidentified HC C6-C8 <br /> Surrogates Control Limits % % Recovery <br /> Tnfluorotoluene 70 130 91 <br /> i <br /> I <br /> analytes reported as N D were not present above the stated limit of detection <br /> 1EQUOIA ANALYTICAL - ELAP #1210 <br />?,rd Herling <br /> ct Manager Page 5 <br /> r <br />