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SEQUOIA ANALYTICAL <br /> 1900 Bales Avenue e Suite LM o Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> Nap <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 Kaprealian, P . QC Sample Group: 1120953-60 Reported: Jan 13, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl. <br /> Benzene Toluene Benzene Xylenes Diesel Oil and Grease <br /> EPA EPA EPA EPA <br /> Method: 8015/8020 8015/8020 8015/8020 8015/8020 E PA801 6 SM5520 <br /> Analyst:' K.N. K.N. K.N. K.N, A.Tuzon D.Newcomb <br /> Reporting Units: mg/kg mg/kg Mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed: Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 Dec 31, 1991 <br /> OC Sample #: Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Cone.: N.D. N.D. N.D. N.D. N.D. N.D. <br /> • Spike Cone. <br /> Added: 0.40 0.40 0.40 1.2 10 5000 <br /> Cone. Matrix <br /> Spike: 0.38 0.39 0.42 1.2 8.5 4400 <br /> Matrix Spike <br /> % Recovery: 95 98 105 100 85 88 <br /> Cone. Matrix <br /> Spike Dup.: 0.41 0.41 0.42 1.2 8.9 4300 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 102 102 105 100 89 86 <br /> Relative <br /> % Difference: 5.1 2.5 0.0 0.0 4.6 2.0 <br /> Laboratory blank contained the following analytes: None Detected <br /> WEQUOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc,of Sample x 100 <br /> Spike Conc.Added <br /> Relative%Difference: Conc,of M.S.-Conc.of M.S.D. X 100 <br /> � —( (Conc.of M.S. + Conc,of M.S.D.)/2 <br /> rC-e:12nda C. Vega <br /> Laboratory Director 1120953.KEI <-12> <br />