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a- ) Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (S 10) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 4PDS Services Client Project ID Unocal#6981 4707 Pacific Ave Stockton Sampled Oct 15, 1997 <br /> 2401 Stanwell Dr, Ste 300 Sample Descript Water, MW-7 Received Oct 16, 1997 <br /> Concord, CA 94520 Analysis Method EPA 8260 Analyzed Oct 29, 1997 <br /> Attention Jarrel Crider Lab Number 710-1207 Reported Oct 31, 1997 <br /> VOLATILE ORGANIC COMPOUNDS (EPA 8260) <br /> Analyte Detection Limit Sample Results <br /> N9/L Ng/L <br /> MTBE 20 63 <br /> Surrogates Control Limit% % Recovery <br /> Dibromofluoromethane 50 150 97 <br /> C <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 /> GIUOIA ANALYTICAL, #1271 <br /> azure on Fife <br /> Jim Bava <br /> Project Manager <br /> 7101203 MPD <8> <br />