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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> 819 5ttiker Avenue Suite 8 Sacramento CA 95834 (9 16)921-9600 FAX(916)921-0100 <br /> 111W Analytical 1455 McDowell 61vd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> f, - - - - - - - - <br /> EA Engineering Science &Tech Client Proj ID Exxon 7-3942, 5153942 1300 Sampled 11/18/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript V2 Received 11/19/98 <br /> Lafayette, CA 94549 Matrix LIQUID = <br /> Analysis Method 8015Mod/8020 Analyzed 11/29/98 <br /> Attention Christa Marting Lab Number 9811 D70-12 Reported 12/03/98 <br /> QC Batch Number GC112998BTEX02A <br /> Instrument ID GCHP02 <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 12500 86000 <br /> Methyl t-Butyl Ether 625 N D <br /> Benzene 125 5700 <br /> Toluene 125 21000 <br /> Ethyl Benzene 125 2600 <br /> Xylenes (Total) 125 13000 <br /> Chromatogram Pattern GAS <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 100 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> ei Mei Shin <br /> lect Manager <br /> Page 12 <br />