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' r ■ , Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (5t0) 988 9600 FAX (510) 988 9673 <br /> Analytical 8 i 9 Striker Avenue Suite 8 Sacramento CA 95834 (916) 92 t 9600 FAX (916) 921 0100 <br /> EA Engineering Science &Tech Client Prol ID Exxon 7-3942, 51539 42 1300 Sampled 08/26/97 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript Trip Blank Received 08/27/97 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 08/29/97 <br /> Attention Christa Marting Lab Number 9708E46-21 Reported 09f04j97 <br /> C Batch Number GC082997BTEX06A <br /> - - - <br /> Unstrument 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 79 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> kQUOIA ANALYTICAL - ELAP #1210 <br /> Fli� Heeling <br />�r t Manager Page 2 <br />