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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX (650)364 9233 <br /> 404 N Wigct Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 92t 9600 FAX (916) 921 0100 <br /> EA Engineering Science &Tech Client Prod ID Exxon 7-3942, 51539 42 1300 Sampled 11/11/97 <br /> 468 Mt Diablo Blvd Ste B100 Sample Descript RW2 Received 11/12/97 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 11/22/97 <br /> Attention Chnsta Marting Lab Number 9711732-13 Reported 12J02197 <br /> C Batch Number GC112297BTEX21A <br /> strument 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 1000 7200 <br /> Methyl t-Butyl Ether s0 350 <br /> Benzene 10 200 <br /> Toluene 10 170 <br /> Ethyl Benzene 10 370 <br /> Xylenes (Total) 10 610 <br /> Chromatogram Pattern Gas <br /> Surrogates Control Limits % % Recovery <br /> rifluorotoluene 70 130 101 <br /> lie <br /> Analytes reported as N D were not present above the stated limit of detection <br /> 1EQUOIA. ANALYTICAL - ELAP #1210 <br /> d Herling <br /> jjr ct Manager Page 17 <br />