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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 lb: Unocal,601 E. Kettleman Ln., Lodi <br /> P.O. Box 998 <br /> Benicia, CA 94510 <br /> .::Attention: Mardo Kaprealian, P.E. OC Sample Group2010084-92 Reported: Jan 10, 1992 <br /> ................. ........ <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 8015/8020 <br /> Analyst: J.F. J.F. J.F. J.F. <br /> Reporting Units: ug/L ug/L ug/L ug/L <br /> Date Analyzed: Jan 6, 1992 Jan 6, 1992 Jan 6, 1992 Jan 6, 1992 <br /> OC Sample Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Cone.: N.D. N.D. N.D. N.D. <br /> Spike Cone. <br /> Added: 20 20 20 60 <br /> Cone. Matrix <br /> Spike: 18 18 18 68 <br /> Matrix Spike <br /> % Recovery: 90 90 90 96 <br /> Cone. Matrix <br /> Spike Dup.: 18 18 19 58 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 90 90 95 96 <br /> Relative <br /> %Difference: 0.0 0.0 5.4 0.0 <br /> Laboratory blank contained the following analytes: None Detected <br /> CAL %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 /> Belinda C. Vega (Cont.of M.S. + Cone.of M.S.D.)/2 <br /> Laboratory Director <br /> 2010084.KEI <2> <br />