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' Sequoia 680 Chesapeake Dnve Redwood City, CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Y� 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(Sio)988 9673 <br /> Analytical 819 Stnker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> EA Engineering Science&Tech Client Prol ID --Exxon 7-3942, 5153942 1300 Sampled 11/04/96 - <br />' 3468 Mt Diablo Blvd Ste B100 Sample Descript Rinse Blank Received 11/05/96 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 11/07/96 <br /> Attention Tracy Faulkner Lab Number 9611209-02 Reported i 1/12/98 ' <br /> QC Batch Number-G-C-1 10-796BT-EX03A <br /> Instrument ID GCHP03 <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 0 50 N D <br /> Ethyl Benzene 050 N D <br /> Xylenes (Total) 0 50 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 90 <br /> I <br /> r <br /> i <br /> i <br /> Analytes reported as N D were not present above the stated limit of detection <br />' SEQUOIA ANALYTICAL - ELAP #1210 <br /> 1 <br /> vin Follett <br /> roject Manager Page 2 <br /> I <br />