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A SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue - Suite LM - Concord,California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> 0-7 <br /> Kaprealian Engineering, Inc. <br /> Client Project ID. Unocal,601 E. Kettleman Ln., Lodi <br /> ...:P.O. Box 996 <br /> Benicia, CA 94510 <br /> Attention: Mardo KaDrealian, P . QC Sample Group: 1120953-60 Reported- Jan 13, 1992 <br /> ........ ...... .... .............. <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Trichloro- Chloro- Chloro- <br /> 1,1-Dichloroethene ethene benzene Benzene Toluene benzene (PID) <br /> Method.- EPA 8010 EPA 8010 EPA 8010 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: S1, S.L. S.L. S.L. S.L. S.L. <br /> Reporting Units: ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg <br /> Date Analyzed: Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 <br /> 0C Sample#: Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc,: N.D. N.D. N.D. N.D. N.D. N.D. <br /> Spike Conc. <br /> Added: 10 10 10 10 10 10 <br /> Conc. Matrix <br /> Spike: 12 11 10 10 10 10 <br /> Matrix Spike <br /> % Recovery: 120 110 100 100 100 100 <br /> Conc. Matrix <br /> Spike Dup.: 11 11 11 10 10 10 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 110 110 110 100 100 100 <br /> Relative <br /> % Difference: 8.7 0.0 9.5 0.0 0.0 0.0 <br /> quality Assurance Statement:All standard operating procedures and quality control requirements have been met. <br /> •SEQUOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of Sample X 100 <br /> Spike Conc.Added <br /> JI <br /> Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> Belinda C. Vega (Conc.of M.S. + Conc.of M.S.D.)/2 <br /> Laboratory Director 1120953.KEI <13> <br />