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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue a Suite LM e Concord California 94520 <br /> (510) 686-9600 e FAX (510) 686-9689 <br /> aprealian Engineering, Inc Client Project ID Unocal, 7303 Pacific Ave, Stockton <br /> 401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E OC Sample Group 2121171-74 Reported Jan 11, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 8010 EPA 8010 <br /> Analyst K Nkll K Nill <br /> Reporting Units Ng/L pg/L <br /> Date Analyzed Jan 7, 1993 Jan 7, 1993 <br /> Sample# 212-1171 Matrix Blank <br /> Surrogate#1 <br /> % Recovery 107 107 <br /> Surrogate#2 <br /> % Recovery 85 108 <br /> I <br /> A&SEQU A ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Cone Added <br /> r <br /> Relative%Difference Cone of M S -Cone of M S D x 100 <br /> Scott&AChieffo (Cone of M S + Cone of M S D)/2 <br /> Project Manager 2121171 KEI <5> <br />