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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/7303 Pacific Ave, Stockton <br /> P 0 Box 996 <br /> Benicia, CA 94510 <br /> Attention Mardo Kaprealian, P E QC Sample Group 112-1160 Reported Jan 15, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> I <br /> SURROGATE <br /> Method EPA 8010 EPA 8010 <br /> Analyst MIN MN <br /> Reporting Units u9/i_ ug/L <br /> Date Analyzed Jan 3, 1992 Jan 3, 1992 <br /> Sample# 112-1160 Blank <br /> Surrogate#1 <br /> % Recovery 74 100 <br /> Surrogate#2 <br /> % Recovery. 74 102 <br />• SEQUOIA ANALYTICAL %Recovery Conc of M S -Cone of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Cone of MSD x 100 <br /> Belinda C Vega (Cone of M S + Cone of MSD)/2 <br /> Laboratory Director 1121160 KEI <6> <br />