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Sequoia 680 Chesapeake Dnvc Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> jqJ60 Analytical 819 Striker 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 02/28/97 <br /> 3468 Mt Diablo Blvd Ste 8100 Sample Descnpt UVB-MW2 Received 03/03/97 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 03/07/97 <br /> Attention Christa Marting Lab Number 9.7_0_30.32-04 _ Reported 03f 12j97_ <br />'QC Batch Number GC030797bTEX06A <br /> Instrument 1D 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 2000 9400 <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 20 200 <br /> Toluene 20 1100 <br />' Ethyl Benzene 20 190 <br /> Xylenes (Total) 20 1700 <br /> Chromatogram Pattern Gas <br />' Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 83 <br /> 1 <br /> Analytes reported as N 0 were not present above the stated lima of detection <br /> 1EQUOIA ANALYTICAL - ELAP 41210 <br /> Follett <br /> ct Manager Page 4 <br />