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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 /> frll,>� Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 792 [865 FAX(707)79Z 0342 <br /> BA Engineering Science&Tech Client Prol ID - ~Exxon 7-3942, 5153942 1300 _-- -� --Sampled 05/20/98 <br /> 3468 Mt Diablo Blvd Ste 8100 Sample Descript MW4 Received 05/21/98 _ <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 06/02/98 - <br /> Attention Chnsta Harting ___ Lab Number 9805E41-03 Reported 06/10/98 <br /> OC Batch Number G60602986TEX17A- - <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 500 1100 <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene _ _ 5 0 _ _ 15 <br /> Toluene 50 N D <br /> tEthyl Benzene 5 0 _ 35 <br /> Xylenes (Total) . 5 0 - 91 <br /> Chromatogram Pattern .. _ ... Gas <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 112 <br /> 1 <br /> Analytes reported as N 0 were not present above the stated limit of detection <br />`SEQUOIA ANALYTICAL - ELAP #1210 <br /> and Herling <br /> ect Manager <br /> Page 6 <br />