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Sequoia680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N %get Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> frll,,� Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> EA Engineering Science &Tech Client Pro l- ID Exxon 7-3942, 51539 42 1300 -Sampled 08/26/97 <br />'r 3468 Mt Diablo Blvd Ste B100 Sample Descript MW5 Received 08/27/97 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 08/29/97 <br /> Attention Chnsta Marting Lab Number 9708E45-08 Reported 09f04J97 <br /> QC Batch-Number GC082997BTEX06A <br /> - - - <br /> Instrument ID GCHP06 <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 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 % % Recovery <br /> Trifluorotoluene 70 130 71 <br /> fi <br /> t <br /> I <br /> Analytes reported as N D were not present above the stated limit of detection <br />�EQUOIAANAL"CAL - ELAP 41210 <br /> RHerling <br />�r t Manager <br /> Page 6 <br />