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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> Waterwork Client Project ID 20241-1, Kooyman Trucking <br /> '0710 Main Street <br /> Escalon, CA 95320 <br /> Attention Robert Juncal QC Sample Group 911 X618 Reported Dec 6 1989 <br /> OUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method: EPA 8015 EPA 8015 EPA 8015 EPA 8015 <br /> Analyst: GS/GM GS/GM GS/GM GS/GM <br /> Reporting Units: mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed: Nov ao, 1969 Nov 30, 1989 Nov 30, 1989 Nov 30, 1989 <br /> QCSample #: 911-3630 911-3630 911-3630 911-3630 <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> Spike Conc. <br /> Added: 1.0 1.0 1.0 3.0 <br /> Conc. Matrix <br /> Spike: 0.55 0.73 0.84 2.7 <br /> Matrix Spike <br /> %Recovery: 55 73 84 90 <br /> Conc. Matrix <br /> Spike Dup.: 0.53 0.68 0.79 2.3 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 53 68 79 77 <br /> Relative <br /> %Difference: 3.7 7.1 6.1 16 <br /> SEAIA N 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 /> Bjorn A. jorknlan (Conc.of M.S. + Conc.of M.S.D.) 2 <br /> Project Manager 9113618.WAT <8> <br />