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Sequoia 680 Chesapeake Drive Redwgod City CA 94063 (650) 364-9600 PAX(650)364-9233 <br /> 404 N WS.,Lane Walnut Creek.CA 94598 (510)988-9600 FAX(510)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)911 0100 <br /> IWO Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> EA Engineering Science &»Tech Client Prof 1D Exxon 7-3942, 5153942 1300- Sampled 05/20/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript MW10 Received 05/21/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 06/02/98 <br /> Attention Christa Marting__ _ Lab Number 9805E41-09 » » Reported 06(10j98 <br /> QC Batch Number GC060298B7EX17A <br /> Instrument ID GCHP17 <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 100 630 <br /> Methyl t-Butyl Ether 50 N D <br /> Benzene 10 -- 81 <br /> Toluene 1 0 85 <br /> Ethyl Benzene 10 11 <br /> Xylenes (Total) - :: -- 1 0 100 <br /> Chromatogram Pattern .. ... Gas <br />' Surrogates Control Limits% % Recovery <br /> Trifluorotoluene 70 130 104 <br /> 1 <br /> 1 <br /> 1 <br /> Analytes reported as N D were not present above the stated I mit of detection <br />,SEQUOIA ANALYTICAL - ELAP #1210 <br /> Phard Herling <br /> lect Manager Page 18 <br />