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Is <br /> SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> ................ <br /> ............... . ............... <br /> Kaprealian Engineering, Inc. Client Project ID: Unocal/7303 Pacific Ave., Stockton <br /> P.O. Box 996 <br /> Benicia, CA 94510 <br /> .Attention: MardolKa realian, P.E. OC Sample Group: 1121160-1163 Jan 15, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> EPA EPA EPA EPA EPA <br /> Method: 8015/8020 8015/8020 8015/8020 8015/8020 8015/8020 EPA 8015 EPA 8015 <br /> Analyst: K.N./J.F. K.N./J.F. K.N./J.F. K.N./J.F. K.N./J.F. A Tuzon A Tuzon <br /> Reporting Units: pg/L pg/L pg/L pg/L pg/L lig/L pg/L <br /> Date Analyzed: Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 Jan 9, 1992 Jan 9, 1992 <br /> Sample #: 112-1160 112-1161 112-1162 112-1163 Blank 112-1160 Blank <br /> Surrogate <br /> % Recovery: 98 100 96 86 98 110 100 <br /> SEQUOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of Sample X 100 <br /> Spike Conc.Added <br /> Relative%Difference: Cone.of M.S.-Conc.of M.S.D. X 100 <br /> Belinda C. Vegd (Conc.of M.S. + Conc.of M.S.D.)/2 <br /> Laboratory Director 1121160.KEII <5> <br />