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4: 680- , Sequoia Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(65 0)364 9233 <br /> �i) 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 814 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, 51539 42 1300 Sampled 08/26/97 <br /> 3468 Mt Diablo Blvd Ste B100 Sample aescrlpt 1UVB-MW1 Received 08/27/97 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 08/29/97 <br /> Attention Chnsta Marting Lab Number 9708E45-09 Reported 09104197 <br /> QC Batch Number=GC082997BTEX22A <br /> Instrument ID GCHP22 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br />' Analyte Detection Limit Sample Results <br /> u9/L ug/L <br /> TPPH as Gas 1000 2400 <br /> Methyl t-Butyl Ether 50 77 <br /> Benzene 10 700 <br /> Toluene 10 18 <br />' Ethyl Benzene 10 19 <br /> Xylenes (Total) 10 42 <br /> Chromatogram Pattern Gas <br /> Surrogates Control Limits % % Recovery <br /> Tnfluorotoluene 70 130 95 <br /> S <br /> Analytes reported as N D were not present above the stated limit of detection <br /> Z7A ANALYTICAL - ELAP #1210 <br /> I <br /> AHeriing <br /> r t Manager <br /> Page 7 <br />