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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94596 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95634 (916) 921 9600 FAX(916)921 0100 <br /> ODS Services Client Project ID Unocal cal#6981,4707 Pacific Ave Stockton Sampled Oct 15, 1997 <br /> 2401 Stanwell Dr , Ste 300 Sample Descript Water, MW-4 Received Oct 16, 1997 <br /> Concord, CA 94520 Analysis Method EPA 8260 Analyzed Oct 29, 1997 <br /> Attention Jarrel Crider Lab Number 710-1204 Reported Oct 31, 1997 <br /> VOLATILE ORGANIC COMPOUNDS (EPA 8260) <br /> Analyte Detection Limit Sample Results <br /> N9/L N9/L <br /> MTBE 20 30 <br /> Surrogates Control Limit% % Recovery <br /> Dibromofluoromethane 50 150 97 <br /> Analytes reported as N D were not present above the stated limit of detection Because matrix effects and/or other factors <br /> required additional sample dilution, detection limits for this sample have been raised <br /> 6L10iA ANALYTICAL, #1271 <br /> Signature on File <br /> Jim Bava <br /> Project Manager <br /> 7101203 MPD <5> <br />