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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX,415) 364 9233 <br /> 404 N W get Lane Walnut Creek CA 94598 (510) 988 9600 FAX t3 LO) 988 9673 <br /> 6 �I Analytical a19 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> EA Engineering Science &Tech Client Prod ID Exxon 7-0137, 5150137 1300 Sampled 04/01/97 <br />' 3468 Mt Diablo Blvd Ste B100 Sample Descript Rinse Blank Received 04/02/97 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 04/08/97 <br /> Attention Christa Marting Lab Number 9704171-02 Reported 04f14/97__ <br /> QC Batch Number GC040897BTEX21A <br /> Instrument 1D GCHP21 -- - . <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L. <br /> TPPH as Gas 50 N D <br /> Benzene 0 50 N D <br /> Toluene 050 078 <br /> Ethyl Benzene 0 50 N D <br />' Xylenes (Total) 0 50 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits% % Recovery <br />' Trifluorotoluene 70 130 95 <br /> Analytes reported as N D were not present above the stated limit of detection <br />'SEQUOIA ANALYTICAL - ELAP #1210 <br /> in Follett <br /> lect Manager Page 2 <br />