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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> a- )QF Analytical 819 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> *DS Services <br /> Client Project ID Unocal#6981,4707 Pacific Ave Stockton Sampled Oct 16, 1997 <br /> 2401 Stanwell Dr, Ste 300 Sample Descript Water, MW-2 Received Oct 16, 1997 <br /> Concord, CA 94520 Analysis Method EPA 8260 Analyzed Oct 29, 1997 <br /> Attention Jarrel Crider Lab Number 710-1203 Reported Oct 31, 1997 <br /> VOLATILE ORGANIC COMPOUNDS (EPA 8260) <br /> Analyte Detection Limit Sample Results <br /> p9/L Ng/L <br /> MTBE 100 <br /> 120 <br /> Surrogates Control Limit% % Recovery <br /> Dlbromofluoromethane 50 150 100 <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 /> *UOIA ANALYTICAL, #1271 <br /> Signature on File <br /> Jim Bava <br /> Project Manager <br /> 7101203 MPD <4> <br />