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680 Chcsapcake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia 404 N Wiget Lant Walnut Crcek CA 94598 (5 10) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue 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 /> 468 Mt Diablo Blvd Ste B100 Sample Descript MW7 Received 10/13/97 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 10/21/97 <br /> Attention Christa Marting Lab Number 9710816-07 Reported 10f24f97 <br /> IC Batch Number GC102197BTEX02A <br /> strument ID GCHP02 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br />'Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> jTPPH as Gas 50 55 <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 /> ylenes (Total) 0 50 N D <br /> Chromatogram Pattern <br /> Unidentified HC C6-C8 <br /> Surrogates Control Limits % % Recovery <br /> Trifluorctoluene 70 130 106 <br /> 1 <br />�naiytes reported as N D were not present above the stated limit of detection <br /> 1EQUOIA ANALYTICAL - ELAP #1210 <br /> rd Herling <br /> ct Manager Page 8 <br /> I <br /> I <br />