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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N Wlget lane Walnut Creek.CA 94598 (510)988-9600 FAX(510)988-9673 <br /> trills Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-Ot00 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707) 792-1865 FAX(707) 79Z 0342 <br /> EA Engineering Science &Tech Client Prol ID Exxon 7-3942, 5153942 1300 --- — Sampled 05/20/98 <br /> 3468 Mt Diablo Blvd Ste 13100 Sample Descript MW2 Received 05/21/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysts Method 8015Mod/8020 Analyzed 06/02/98 <br /> Attention Christa Marting » _ Lab Number 9805E41-01 _ Reported 06J10J98 » <br />'QC Batch Number GC0602981YTE5(03A <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 50 110 <br /> Methyl t-Butyl Ether2 5 41 <br /> - <br /> Benzene 050 .. 1.5 <br /> Toluene 050 N D <br /> Ethyl Benzene .. .. 050 1 1 <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern <br /> Gas& Unidentified HC C6-CS <br /> Surrogates Control Limits % % Recovery <br /> Trlfiuorotoluene 70 130 80 <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> EQUOIA ANALYTICAL - ELAP 41210 <br /> and Herling <br /> ect Manager <br /> Page 2 <br />