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j 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 Pacific Ave , Stockton <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E QC Sample Group 2110460-516 Deported Nov 25, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K Nil] K Nil[ K Nill K Nill K Nill K Nil] K Nil <br /> Reporting Units ug/kg u9/k9 u9/k9 u9/k9 u9/k9 u9/k9 u9/kg <br /> Date Analyzed Nov 16, 1992 Nov 16, 1992 Nov 16, 1992 Nov 16, 1992 Nov 16, 1992 Nov 16, 1992 Nov 16, 1992 <br /> Sample# 211.0505 211-0506 211-0507 211-0508 211-0509 211-0510 211-0511 <br /> 16 <br /> Surrogate #1 <br /> % Recovery 118 120 117 90 99 104 100 <br /> Surrogate#2 <br /> % Recovery 105 108 104 107 106 105 106 <br /> SEQUOI NALYTIC L %Recovery Cone of M S -Cone of Sample x 100 <br />. Spike Conc Added <br /> Relative%Difference Cone of M S -Conc of MSD x 100 <br /> Ott C 1 O (Cone of M S + Cone of M S D)/2 <br /> Project Manager 2110502 KEI 729 <br />