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680 Chesapeake Drive Rcdwood City CA 94063 <br /> Sequoia (650) 364 9600 FAX (650)364 9233 <br /> 404 N Wigct Lane Walnut Creek CA 94598 (510) 986 9600 FAX (510) 988 9673 <br /> Analytical 819 StrikerAvenuc Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> EA Engineering Science &Tech Client Prol ID Exxon 7-0137, 51501 37 1300 Sampled 10/10/97 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript MW4 Received 10/13/97 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 10/21/97 <br /> Attention Chnsta Marting Lab Number 9710816-04 Reported 10124197 <br /> C Batch Number GC1 02197BTEX21 A <br /> Istrument ID GCHP21 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br />'Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> ITPPH as Gas 50 N D <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 050 N D <br /> Toluene 050 N D <br /> Ethyl Benzene 050 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits % % Recover <br /> rifluorotoluene 70 130 82 <br /> analytes reported as N D were not present above the stated limit of detection <br /> 1EQUOIA ANALYTICAL - ELAP W1210 <br /> t <br /> rd Herling <br /> ct Manager Pae s <br /> 9 <br />