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Sequoia _ �°� '`°Dr"` Redwood City CA 94063 (650)364-9600 FAX(6 50)364-9233 <br /> 404 N Wlget Eane Walnut Creek.CA 94598 (925)988-9600 FAX(925)968-9673 <br /> 819 Striker Avenue.Suite 8 Sacramento.CA 95834 (916)92t-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> EA Engineering Science&Tech Client Prol ID Exxon7-0137, 5150137 1300 Sampled 01/26/99 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descnpt MW7 Received 01/28/99 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 01/29/99 <br /> Attention MattDerby _ Lab Number 9901D89-07 Reported 02103199 <br /> QC Batch Number GC012999BTEX06A <br /> Instrument ID GCHP06 <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 78 <br /> Methyl t-Butyl Ether <br /> 25 N D <br /> Benzene 050 N D <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 /> Trifluorotoluene 70 130 87 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 41210 <br /> -- -A�% <br /> Pect Manager Page 7 <br />