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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAx(650)364-9233 <br /> 404 N Wiget lane Walnut Creek.CA 94598 (510)988 9600 FAX(510)988 9673 <br /> Analytical 819 Straker Avenue Suue 8 Sacramenro CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Peraluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> EA Engineering Science&Tech Client Prol ID Exxon 7-3942, 5153942 1300 Sampled 05/20/98 <br /> 3488 Mt Diablo Blvd Ste B100 Sample Descript V3 Received 05/21/98 <br />' Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 06/02/98 _ <br /> Attention Chnsta Marting - Lab Number_ 9805E43_20 _ _ Reported 06/10198 <br />�QC Batch Number GC060298BTEX03A - <br /> instrument ID GCHP03 <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 5000 44000 <br /> Methyl t-Butyl Ether 250 730 <br /> Benzene 50 88 <br /> Toluene 50 1200 <br /> Ethyl Benzene 50 2900 <br /> Xylenes (Total) 5o 14000 <br /> Chromatogram Pattern Gas <br />' Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 82 <br /> t <br /> Analytes reported as N 0 were not present above the stated limit of detection <br /> FEQUOIA ANALYTICAL - ELAP #1210 <br /> and Herling <br /> ect Manager Page 2 <br />