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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 /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> IRPDS Services Client project ID Unocal #2859, 1665 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 7020891-899 Reported Mar 4, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Redox <br /> Potential <br /> Anally Method ASTMD149876 <br /> Prep Method <br /> Analyst T McMahon <br /> Duplicate <br /> Sample # 9702845-9 <br /> i <br /> Prepared Date 2/18/97 <br /> Analyzed Date 2/18/97 <br />�trument I D # Manual <br /> Sample <br /> Concentration 180 mV <br /> Dup Sample <br /> Concentration 180 my <br /> RPD 00 <br /> RPD Limit 0-20 <br /> SEQUOIA ANALYTICAL, #1210 <br /> 4ignature on File <br /> Alan S Kemp <br /> Project Manager **RPD=Relative% Difference <br /> 7020891 MPD X147 <br />