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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 • FAX (415) 364-9233 <br /> ... <br /> Waterwork Client Project ID: #20223-1, Knowles Property <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Attention: Jim Scholland QC Sample Group: 910-2415 Reported: Oct 31, 1989 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xyienes <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: GS/JD GS/JD GS/JD GS/JD <br /> Reporting Units: mg/Kg mg/Kg mg/Kg mg/Kg <br /> Date Analyzed: Oct 26, 1989 Oct 26, 1989 Oct 26, 1989 Oct 26, 1989 <br /> QC Sample #: 910-3714 910-3714 910-3714 910-3714 <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> Spike Conc. 1 1 1 3 <br /> Added: <br /> Conc. Matrix 0.48 0.71 0.85 2.4 <br /> Spike: <br /> Matrix Spike 48 71 85 80 <br /> % Recovery: <br /> Conc. Matrix 0.52 0.77 0.81 2.3 <br /> Spike Dup.: <br /> Matrix Spike 52 77 81 77 <br /> Duplicate <br /> % Recovery: <br /> Relative 8 8.1 4.8 4.3 <br /> % Difference: <br /> SEQUOIA 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 /> BJo A. orkman (Conc.of M.S. + Conc.of M.S.D.) 2 <br /> Project Manager 9102415.WAT <4> <br />