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s \ Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(654)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 983 9600 FAX(510)988 9673 <br /> �llll� <br /> nmento CA 95834 (9[6} 921 9600 FAX(916)92k D[00 <br /> Analytical 819 StrtkerAvenue Suite 8 Sat: <br /> EA Engineering Science &Tech Client Prof ID Exxon 7-3942, 5153942 1300 Sampled 03/03/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descnpt RW2 Received 03/04/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 03/16/98 <br /> Attention Christa Marting Lab Number 9803306-14 Reported 03131198 <br /> C$atch Number GC0316986TEX2IA <br /> Istrument 1D GCHP21 -- <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 500 6000 <br /> Methyl t-Butyl Ether 25 260 <br /> Benzene 50 92 <br /> Toluene 50 160 <br /> Ethyl Benzene so 300 <br /> Xylenes (Total) 50 590 <br /> Chromatogram Pattern Gas <br /> iSurrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 116 <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> 1EQUOIA ANALYTICAL - ELAP 01210 <br /> 11 <br /> j*rd Herling <br /> ct Manager Page 10 <br />