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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> war (510) 686-9600 • FAX (510) 686-9689 <br /> Kaprealtan Engineering, Inc Client Project ID Unocal #5421, 7303 Pacific Ave , Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kapreallan, P E OC Sample Group 2110460-516 Reported Nov 25, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K Nil] K NEII K Nill <br /> Reporting Units ug/kg ug/kg ug/kg <br /> Date Analyzed Nov 17, 1992 Nov 18, 1992 Nov 16, 1992 <br /> Sample # 211-0512 211-0513 Matrix Blank <br /> i <br /> Surrogate#1 <br /> % Recovery 105 108 102 <br /> Surrogate #2 <br /> % Recovery 103 105 106 <br /> SEQUOI NALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> r' <br /> Relative%Difference Conc of M S -Cone of MSD x 100 <br /> c tt A C leffo (Cone of M S + Conc of M S D)/2 <br /> Project Manager 211G502KEI <30> <br />