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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. OC Sample Group 1120659-678 Reported Jan 2, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> EPA EPA EPA EPA <br /> Method: 8015/8020 8015/8020 8015/8020 6015/8020 <br /> Analyst: J.F. J.F. J.F. J.F. <br /> Reporting Units: mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed: Dec 26, 1992 Dec 26, 1992 Dec 26, 1992 Dec 26, 1992 <br /> OC Sample#.- Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> Spike Conc. <br /> Added: 0.40 0.40 0.40 1.2 <br /> Conc. Matrix <br /> Spike: 0.37 0.38 0.40 1.2 <br /> Matrix Spike <br /> %Recovery: 92 95 100 100 <br /> Conc. Matrix <br /> Spike Dup.: 0.41 0.41 0.49 1.3 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 102 102 110 108 <br /> Relative <br /> %Difference: 10 7.6 9.5 8.0 <br /> Laboratory blank contained the following analytes: None Detected <br /> SEQUOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of Sample x 100 <br /> 04�v# <br /> Spike Conc.Added <br /> Relative 96 Difference: Conc.of M.S.-Conc.of M.S.D. x 1DD <br /> S (Conc.of M.S. + Conc.of M.S•D.) 2 <br /> ProjectManag <br /> 1120659.KEI <3> <br />