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e <br /> SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord,California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> 10prealian Engineering, Inc Client Project iD Unocal, 2835 Navy Dr, Stockton <br /> ,01 Stanwell Dr, Ste 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E OC Sample Group 3051 491-1 497 Reported Jun 8, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 8015 <br /> Analyst K Wimer <br /> Reporting Units ,u9/L <br /> Date Analyzed Jun e, 1993 <br /> Sample # Matrix Blank <br /> 0 <br /> Surrogate <br /> % Recovery 90 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> !Project <br /> Spike Conc Added <br /> Relative% Difference Conc of M S Conc of M S D x 100 <br /> 4Manager (Conc of M S + Conc of M S D)/2 <br /> 3051491 KEI <7> <br />