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j SEQUOIA ANALYTICAL <br /> 4 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 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 23, 1992 Nov 23, 1992 Nov 23, 1992 Nov 23, 1992 Nov 23, 1992 Nov 23, 1992 Nov 23, 1992 <br /> Sample# 211-0505 21141506 211-0507 211-0508 211-0509 211-0510 211-0511 <br /> Surrogate <br /> % Recovery 117 118 110 114 109 103 110 <br /> :Ott <br /> QUOI ANALYTICAL �Recovery Cone 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 /> hieffo (Cone of M S + Cone of M S D)/2 <br /> Project Manager 2110502 KEI <24> <br />