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r , 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 /> 819 Straker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> �,I,,�► Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 6 <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 RW4 Received 05/21/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method EPA 8260 Analyzed 05/26/98 <br /> Attention Chnsta Marting Lab Number 9805E41-15 Reported 06J10198 <br /> rOC Batch Number MS052698MTBEH68 <br /> instrument ID H6 <br /> Methyl t-Butyl Ether (MTBE) <br /> rAnalyte Detection Limit Sample Results <br /> ug/L ug/L <br /> rMethyl t-Butyl Ether 67 N D <br /> Surrogates Control Limits % % Recovery <br /> 1,2-Dichloroethane-d4 76 114 108 <br /> r <br /> r <br /> r <br /> r <br /> r <br /> r <br /> r <br /> Analytes reported as N D were not present above the stated limit of detection <br /> FQUOIA ANALYTICAL - ELAP #1210 <br /> and Herling <br /> ect Manager <br /> Page 29 <br /> 1 � <br />