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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 /> P O Box 996 <br /> Benicia, CA 94510 <br /> Attention Mardo Kaprealian, P E OC Sample Group 2110456-459 Reported Nov 24, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 8015 EPA 8015 EPA 8015 <br /> Analyst K tamer K tamer K Wimer <br /> Reporting Units ug/L Ing/L ug/L <br /> Date Analyzed Nov 19, 1992 Nov 19, 1992 Nov 19, 1992 <br /> Sample# 211-0458 211-0459 Matrix Blank <br /> Surrogate <br /> % Recovery 101 92 107 <br /> SE 1A1A ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Cone Added <br /> r <br /> Relative%Difference Conc of M S -Cone of M S D x 100 <br /> colt A Chieffo (Conc of M S + Conc of M S D)/2 <br /> Project Manager 2110456 KEI <8> <br />