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r Sequoia 680 Chesapeake Dave Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N Wtget Lane Walnut Creek,CA 94598 (510)988-9600 FAX(510)988-9673 <br /> Analytical 819 Sinker 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 /> Z. <br /> EA Engineering Science 8t Tech— Client Pro] ID Exxon 7-3942, 5153942 1300 Sampled-05/20/98' <br /> 3468 Mt Diablo Blvd Ste 6100 Sample Descript MW4 Received 05/21/98 - <br />' Lafayette, CA 94549 Matrix LIQUID = <br /> Analysis Method ERA 8260 Analyzed 05/24/98 <br /> Attention Chnsta Marting _ Lab Number 9805E41-03 __ Reported 06110/98 - <br />�CC Batch Number MS052498MTBEH6A__.---- <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 65 <br /> Surrogates Control Limits% % Recove <br /> 1,2-Dichloroethane-d4 76 114 103 <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> and Herling <br /> ect Manager <br /> Page 5 <br /> r <br />