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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiger Lane Walnut Creek CA 94598 (510)988-9600 FAX(S10)988-9673 <br /> Analytical 1191...ker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> EA Engineering Science&Tech Client Prol ID 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 EPA 8260 Analyzed 05/24/98 _ <br /> Attention Chnsta Marting Lab Number 9605E41-09 _ Reported 06/10/98 <br /> _ - -- -- <br /> CC Batch Number MS052498MTBEH6A <br /> _ <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 20 N D <br />' Surrogates Control Limits% % Recovery <br /> 1,2-Dlchloroethane-d4 76 114 103 <br /> I <br /> Analytes reported as N D were not present above the stated lima of detection <br />'SEQUOIA ANALYTICAL - ELAP #1210 <br /> 'T '1 1 <br /> and Herling <br /> lett Manager <br /> Page 17 <br /> 4 <br />