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' Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0[00 <br /> EA Engineering Science &Tech Client Prol ID -Exxon 7-3942, 5153942 1300 Sampled 03/03/98 <br /> _ 3468 Mt Diablo Blvd Ste 8100 Sample Descript RB Received 03/04/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 03/14/98 <br /> Attention Christa Martmg Lab Number 9803307-23 Reported 03f 31 j98 <br /> C Batch Number GC031498BTEX21Atstrument 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 050 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 % % Recovery <br /> Trlfluorotoluene 70 130 103 <br /> Analytes reported as N D were not present above the stated ilmtt of detection <br /> REQUOIA ANAL ]CAL - ELAP #1210 <br /> and Herling <br /> ect Manager Page 10 <br />