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Sequoia 1180 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9Z33 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (5 10)988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue 5uite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-9100 <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 MW9 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 9805E41-08 Reported <br /> 06J 10198 <br />'CC Batch Number MS052498MTBEH6A -- <br /> Instrument ID H6 <br /> Methyl t-Butyl Ether (MTBE) <br />' Analyte Detection Limit Sample Resuits <br /> ug/L. ug/L <br /> Methyl t-Butyl Ether 20 20 <br />' Surrogates Control Limits % % Recovery <br /> 1,2-Dlchloroethane-d4 76 114 104 <br /> I <br /> I <br /> Analytes reporter[as N 0 were not present above the stated limit of detection <br /> PEOU01A ANALYTICAL - ELAP #1210 <br /> andNerlmg <br /> ect Manager Page 15 <br />