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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> NO (510) 686-9600 • FAX (510) 686-9689 <br /> Caprealian Engineering, Inc Client Project ID Former Unocal Bulk Plant #0950, Stockton <br /> 2401 Stanwell Dr, Ste 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E OC Sample Group 3030009-015 Reported Mar 11, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 8015 <br /> Analyst K Wimer <br /> Reporting Units us/L <br /> Date Anaiyzed Mar 9, 1993 <br /> Sample# Matrix Blank <br /> Surrogate <br /> %Recovery 106 <br /> EOU IA ANALYTICAL % Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Ott A h O4 (Conc of M S + Conc of MSD)/2 <br /> Project Manager 3030009 KEI <7> <br />