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j SEQUOIA ANALYTICAL <br /> law1900 Sates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> skKaprealian 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 8015 EPA 8015 EPA 8015 EPA 8015 EPA 8015 EPA 8015 EPA 8015 <br /> Analyst K Wimer K Wimer K Wimer K Wimer K Wimer K Wimer K Wimer <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Nov 20, 1992 Nov 20, 1992 Nov 20, 1992 Nov 20, 1992 Nov 20 1992 Nov 20, 1992 Nov 20 1992 <br /> Sample# 211-0484 211-0485 211-0486 211-0487 211-0488 211-0489 211-0490 <br /> Surrogate <br /> % Recovery 112 113 116 119 112 119 i11 <br /> SEQ4Aie4o <br /> NALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Cone Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> S tt (Cone of M S * Conc of M S D)/2 <br /> Project Manager 2110502 KEI <21> <br />