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Sequoia "8O Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> q 404 N Wlget Lane Walnut Creek,U 94598 (925)988-9600 FAX(925)988-9673 <br /> 5) Analytical 819 sulker Ave 51v-Suite 8 Sacramento,U 95834 (936)922-9600 FAX(916)921-0300 <br /> 1455 McDowell BNd North,Ste D ['etaluma.U 44954 (707)792-1865 FAX(707)792-0342 <br /> EA Engineering Science &Tech Client Prol ID Exxon?-0137,15150137 1300 - Sampled 01/26/99 <br /> 3468 Mt Diablo Blvd Ste 8100 Sample Descript MW5 Received 01/28/99 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 02/01/99 <br /> Attention Matt Derby Lab Number_ 9901 D89-05 Reported 02J03/99 <br /> QC Batch Number GCO20199BTEX30A <br /> Instrument ID GCHP30 <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 <br /> 86 <br /> Methyl t-Butyl Ether 26 71 <br /> Benzene 050 N D <br /> Toluene 050 4 7 <br /> Ethyl Benzene 050 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern C6-C12 <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 1600 <br /> • <br /> I <br /> ti <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> Qect Manager Page 5 <br />