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w <br /> SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue a Suite LM • Concord, California 94520 <br />. (415) 686-9600 0 FAX (415) 686-9689 <br /> Nw <br /> Kapreallan Engineering, Inc Client Project ID Unocal, 7303 Pacific Ave , Stockton <br /> P O Box 996 <br /> Benicia, CA 94510 <br /> Attention Mardo Kaprealian, P E QC Sample Group 106-0740 Reported Jul 11, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> I <br /> Method EPA 6010 EPA8010 <br /> Analyst S Le S Le <br /> Reporting Units ppb ppb <br /> Date Analyzed Jul 3, 1991 Jul 3, 1991 <br /> Sample# 106-0740 Blank <br /> 0 <br /> Surrogate #1 <br /> % Recovery 86 96 <br /> Surrogate#2 <br /> % Recovery 85 94 <br /> QQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> U/ Spike Cone Added <br /> `-'/ Relative%Difference Cone of M S -Cone of MSD x 100 <br /> Belinda C Vega (Cone of M S + Conc of MSD)/2 <br /> Laboratory Director 1060740 KEI <10> <br />