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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 #5421, 7303 Paclflc Ave , Stockton <br /> PC Box 996 <br /> Benicia, CA 94510 <br /> Attention Mardo Kapreallan, P E QC Sample Group 2110456-459 Reported Nov 24, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K Nil] K Nill K NIII <br /> Reporting Units >1s/L ug/L ug/L <br /> Date Analyzed Nov 18, 1992 Nov 18, 1992 Nov 18, 1992 <br /> Sample # 211-0458 211-0459 Matrix Blank <br /> 10D <br /> Surrogate #1 <br /> % Recovery 65 62 79 <br /> Surrogate#2 <br /> % Recovery* 108 107 110 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Cone of Sample x 100 <br /> Spike Cone Added <br /> Relative%Difference Cone of M S -Cone of M S D x 100 <br /> c*Ahieff (Gone of M S + Cone of M S D}/2 <br /> Project Manage 2110456 KEI <br />