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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364 9233 <br /> 404 N Wiget Lane Walnur Creek CA 94598 (510)988 9600 FAX{510)988-9673 <br /> Analytical 819 Striker Avenue Suwre 8 Sacramento CA 95834 (916)921-9600 FAX (916)921-010 0 <br /> 1455 McDowell Blvd North Sre 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 05/20/98- <br /> 3468 Mt Diablo Blvd Ste 8100 Sample Descript MW2 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 9805E41-01 - _ Reported 06Ji0198 <br />'QC 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 N D <br /> Surrogates Control Limits % % Recovery <br /> 1 2-Dichloroethane-d4 76 114 101 <br /> 1 <br /> 1 <br /> Analytes reported as N 0 were not present above the stated limit of detection <br />'SEQUOIA ANALYTICAL - ELAP #1210 <br /> and Herling <br /> ect Manager <br /> Page 1 <br /> 1 <br />