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Sequoia 680 Chesapeake Drive Redwood Cry CA 94063 (650) 36:-9600 FAX(650) 364 9233 <br /> 404 N Wiger lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988 9673 <br /> 819 5trcker Avenue Suite 8 Sacramento CA 95834 (916)9Zl 9600 FAX(916)921 0100 <br /> 6 X117 Analytical 1455 McDowell Blvd North Sce D Petaluma.CA 94954 (707)792-1865 FAX(707) 792 034Z <br /> EA Engineering Science &Tech Client Prol ID Exxon, 7-0137, 5150137 1300 Sampled 04/15/98 <br /> 3468 Mt Diablo Blvd Ste 8100 Sample Descrlpt MW2 Received 04/17/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/B020 Analyzed 04/23/98 <br /> Attention Chnsta Marting _ _ Lab Number 9804C34-02 - reported 04j27196 <br /> QC Batch Number-GC042398BTEX21 A µ <br /> Instrument ID 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 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 0 50 N D <br /> Xylenes (Total) 0 50 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits % % Recover <br /> Tnfluorotoluene 70 130 108 <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> tk' <br /> and Herling <br /> ect Manager Page 2 <br /> r <br />