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' 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)988 9600 FAX(9Z5)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921 0100 <br /> Analytical 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 08/19/98 <br />' 3468 Mt Diablo Blvd Ste B100 Sample Descript IW1 Received 08/20/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method EPA 8260 Analyzed 08/27/98 <br /> Attention Chnsta Marting Lab Number 9808C97-13 Reported 09104198 <br /> QC Batch Number MS082798MTBEH6A <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 40 N D <br /> Surrogates Control Limits % % Recovery <br /> 1,2-Dichloroethane-d4 76 114 91 <br /> r <br />�s <br /> analytes reported as N D were not present above the stated 111"nit of detection <br /> VQUOIA ANALYTICAL - ELAP #1210 <br />,I* Herling <br />:)rt Manager Page 7 <br />