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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> 0 (415) 686-9600 • FAX (415) 686-9689 <br /> NO <br /> Kaprealian 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 OC Sample Group 1080740-43 Reported Jul 11, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPAS015/8020 EPA8015/8020 EPAS015/8020 EPA8015/8020 EPAS015/8020 <br /> Analyst RH/JF RH/JF RH/JF RH/JF RH/JF <br /> Reporting Units ug/L Ng/L ug/L Mg/L ug/L <br /> Date Analyzed Jul 3, 1991 Jul 3, 1991 Jul 3, 1991 Jul 3, 1991 Jul 3, 1991 <br /> Sample # 106-0740 106-0741 106-0742 106-0743 Blank <br /> Surrogate <br /> % Recovery 92 93 92 92 100 <br /> QQUOIA ANALYTICAL %Recovery Conc of M S -Cone of Sample x 100 <br /> Spike Cont Added <br /> C ( Relative%Difference Cone of M S -Cone of M S D x 100 <br /> Belinda C Vega (Cont of M S + Conc of M S V),(2 <br /> Laboratory Director 1060740 KEI <3> <br />