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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N Wigec Lane Walnut Creek CA 94598 (925)9138 9600 FAX(925)988-9673 <br /> Analytical $19 Srr'ker Avenue Sulte 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792 1865 FAX(707)792-0342 <br /> EA Engineering Science &Tech Client Prol ID Exxon 7-3942-, 5153942 1300 Sampled 11/18/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript MW1 Received 11/19/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysts Method 8015Mod/8020 Analyzed 11/27/98 <br /> Attention Christa Marting Lab Number 9811 D70-01 _ Reported 12103198 <br />' qC Batch Number GC112796BTEX02A - - <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 50 N D <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 0 50 N D <br /> Toluene 050 N D <br /> Ethyl Benzene 050 N D <br /> Xylenes (Total) N D <br /> Chromatogram 0 SO Pattern <br />' Surrogates Control Limits % % Recovery <br /> Trlfluorotoluene 70 130 100 <br /> Analytes reported as H D were not present above the stated limit of detection 4 C E 11.1 E U <br /> SEQUOIA ANALYTICAL - ELAP #1210 DEC E 193 <br /> H , ;NGlt4bEHiNG <br /> AND TECrilVC <br /> 16ect <br /> Met Shin <br /> Manager <br /> Page 1 <br />