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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> Kapreallan Engineering, Inc Client Project ID Unocal, 2835 Navy Dave, Stockton <br /> P O Box 996 <br /> Benicia, CA 94510 <br /> Attention Mardo Kapreahan, P E OC Sample Group 2041289-1292 Reported May 1 1992 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> EPA EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 8015/8020 EPA8015 EPA8015 <br /> Analyst K E K E K E K E K E A Tuzon A Tuzon <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Apr 30 1992 Apr 30 1992 Apr 30 1992 Apr 30 1992 Apr 30 1992 Apr 30 1992 Apr 30 1992 <br /> Sample # 204-1289 204-1290 204-1291 204-1292 Mank 2041289 204-1290 <br /> Surrogate <br /> %Recovery 87 79 79 91 100 208 221 <br /> I <br /> ` SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative% Difference Cone of M S Conc of M S D x 100 <br /> Scott A C leffa (Cone of M S + Conc of M S 0)/2 <br /> Project Manager 2041289 K.E �s, <br />