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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,601 E. Kettleman Ln., Lodi <br /> P.O. Box 996 <br /> Benicia, CA 94510 <br /> Attention Mardo Kapreallan P E QC Sample Group. 1120975-981 Reported Jan 6, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> EPA EPA EPA EPA EPA EPA EPA <br /> Method: 8015/8020 6015/8020 8015/8020 8015/8020 8015/8020 8015/8020 8015/8020 <br /> Analyst: J.F. J.F. J.F. J.F. J.F. J.F. J.F. <br /> Reporting Units: mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed: Dec 29, 1991 Dec 29, 1991 Dec 29, 1991 Dec 29, 1991 Dec 29, 1991 Dec 29, 1991 Dec 29, 1991 <br /> Sample#: 112-0975 112-0975 112-0977 112-0978 112-0979 112-0980 112-0981 <br /> Surrogate <br /> % Recovery: 100 100 98 100 110 99 96 <br /> SEQUOIA ANALYTICAL %Fteoovery: Conc.of M.S.-Conc.of Sample x 100 <br /> Spike Conc.Added <br /> F Relative%Difference: Conc,of M.S.-Conc.of M.S.D. x 100 <br /> Belinda C. Vega (Cone.of M.S. + Conc.of M.S.D.) 2 <br /> Laboratory Director <br /> 1120961.KEI <11> <br />