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' Sequoia 6130 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Line Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue Suite B Sacramento CA 95834 (916)921-9600 FAX(916)921 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)79Z 1865 FAX(707)792-034Z <br /> EA Engineering Science &Tech Client Proj ID -"Exxon 7-3942, 5153942 1300 Sampled 05/20/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript MW12 Received 05/21/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method EPA 8260 Analyzed 05/24/98 <br /> Attention Chnsta Marting _ Lab Number 9805E41-11 Reported 06f10j98 <br /> QC Batch Number MS0524981`&BEH6A - <br /> Instrument ID H6 <br /> Methyl t-Butyl Ether (MTBE) <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br />' Methyl t-Butyl Ether 2 0 N D <br /> Surrogates Control Limits % % Recovery <br /> 1,2-Dichloroethane-d4 76 114 103 <br /> 1 <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> --T <br /> and Herling <br /> sect Manager Page 21 <br />