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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510)988 9600 FAX(5tO)988-9673 <br /> �rlll>� <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-010 0 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792 1865 FAX(707)792-034Z <br /> EA Engineering Science &Tech Client Proj 1D Exxon 7-3942, 5153942 1300 Sampled 05/20/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript RW1 Received 05/21/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method EPA 8260 Analyzed 05/24/98 <br /> Attention Christa Marting Lab Number 9805E41-13 Reported 06/10/98 <br />� <br /> C Batch Number MS052498MTBEH6A - <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 33 N D <br /> Surrogateg Control Limits % % Recovery <br /> 1,2-Dichloroethane-d4 76 114 105 <br /> 1 <br /> 1 <br /> Malytes reported as N D were not present above the stated limit of detection <br /> IEQUOIA ANALYTICAL - ELAP 41210 <br /> 1 <br /> Herling <br /> f'rd <br /> ct Manager <br /> Page 25 <br />