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® SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> Kaprealian 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 Reported 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 6010 <br /> Analyst K Nill K Ndl K Nrll K Niii K Nil] K Nil[ K Nrll <br /> Reporting Units ug/kg ug/kg ug/k9 Ng/k9 ug/kg Y9/k9 ug/kg <br /> Date Analyzed Nov 17, 1992 Nov 18, 1992 Nov 18, 1992 Nov 18, 1992 Nov 18, 1992 Nov 18, 1992 Nov 17, 1992 <br /> Sample# 211-0484 211-0485 211-0486 211-0487 211-0468 211-0489 211-0490 <br /> Surrogate#1 <br /> % Recovery 121 92 102 94 82 84 119 <br /> Surrogate#2 <br /> % Recovery 105 107 105 105 103 105 106 <br /> SEQUOIA NALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> tt <br /> eCi (Conc of M S + Conc of M S D)72 <br /> Project Manager 2110502 KEI <26> <br />