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Sequoia 6W Chesapeake <br /> Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N "get Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)79Z-1865 FAX(707)792-0342 <br /> EA Engineering Science &Tech Client Prol ID Exxon?-0137, 5150137 1300 Sampled 01/26/99 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript MW4 Received 01/28/99 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 01/28/99 <br /> Attention MattDerby Lab Number 9901089-04 Reported 02103/99 <br /> QC Batch Number GC012899STEX06A - <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 N D <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 0 50 N D <br /> Toluene 0 50 N D <br /> Ethyl Benzene 0 50 N D <br /> Xylenes (Total) 0 50 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits% % Recovery <br /> Trlfluorotoluene 70 130 80 <br /> i <br /> s <br /> k . <br /> Analytes reported as N 0 were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> act Manager Page 4 <br />