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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM e Concord,California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> Kapreallan Engineering, Inc. <br /> Client Prolect ID: Unocal, 601 E.Kettlernan, Lodi <br /> P.O. BOX 996 <br /> Benicia, CA-94510 <br /> ,Attention: MardolKapreallan, P.E. OC Sample Group: 2040292-300 Reported: Apr 22, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> EPA EPA EPA EPA EPA EPA EPA <br /> Method: 8015/8020 8015/8020 8015/8020 8015/8020 8015/8020 8015/8020 8015/8020 <br /> Analyst: K.N. K.N. K.N. K.N. K.N. K.N. K.N. <br /> Reporting Units: ug/L ug/L ug/L ug/L ug/L ug/L ug/L <br /> Date Analyzed: Apr 15, 1992 Apr 15, 1992 Apr 15, 1992 Apr 15, 1992 Apr 15, 1992 Apr 15, 1992 Apr 15, 1992 <br /> Sample#: 204-0292 204-0293 204-0294 2040296 204-O29s 2134-0297 204-0298 <br /> 0 <br /> Surrogate <br /> %Recovery: 89 87 85 89 87 91 90 <br /> OSEQUOIA ANALYTICAL %Recovery. Cone.of M.S.-Cone.of Sample x 100 <br /> 4 Spike Com.Added <br /> Relative%Difference: Cone.of M.S.-Cone.of M.S.D. x 100 <br /> Belinda C.Vega (Cone.of M.S. + Conc.of M.S.D,)7-2 <br /> Laboratory Director 204092-79—<3> <br />