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Sequoia 680 Chesapeake Drive Redwood Ciry CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> 1 404,N WYget Lane Walnut Creek CA 94598 (925)968 9600 FAX(925)988 9673 <br /> Analytical 819 Scriker 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 Proj ID Exxon 7-3942, 5153942 1300 Sampled 08/19/98 <br /> 3468 Mt Diablo Blvd Ste 8100 Sample Descrlpt MW4 Received 08/20/98 <br />' Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method EPA 8260 Analyzed 08/27/98 <br /> Attention Christa Marting Lab Number 9808C95-03 Reported 09104198 <br />�QC Batch Number MS082798MTBEH6A <br /> nstrument 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 77 <br /> Surrogates Control Limits % <br /> / Recovery <br /> 1,2-Dichloroethane-d4 76 114 96 <br /> ialytes reported as N D were not present above the stated limit of detection <br /> EQUOIA ANALYTICAL - ELAP 301210 <br /> Heriing ` <br /> Manager <br /> Page 5 <br />