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15) SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> 'au, <br /> Waterwork Client Project ID: 20241-1, Kooyman Trucking <br /> 1710 Main Street <br /> `P.Escalon, CA 95320 <br /> �Attention: Robert Juncall OC Sample 911-3618 Reported: Dec 6, 19M <br /> bwm-� - <br /> 3X1. <br /> ........ <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Lead Cadmium Chromium Zinc <br /> Method: EPA 7421 EPA wo EPA 6010 EPA 6010 <br /> Analyst: R. Britton S. Foster S. Foster S. Foster <br /> Reporting Units: mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed: Nov 29, 19e9 Dec 4, 11389 Dec 4, 1969 Dec 4, 1989 <br /> QC Sample#: 911-3618 9113618 9113618 9113618 <br /> Sample Conc.: 0.10 N.D. 0.53 1.1 <br /> Spike Conc. <br /> Added: 0.050 1.0 1.0 1.0 <br /> Conc. Matrix <br /> Spike: 0.16 0.82 1.3 1.8 <br /> Matrix Spike <br /> % Recovery: 120 82 75 65 <br /> Conc. Matrix <br /> Spike Dup.: 0.14 0.79 1.1 1.7 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: so 79 60 54 <br /> Relative <br /> %Difference: 13 3.6 22 18 <br /> U ' ANAL AL %Recovery: Conc.of M.S.-Cone.of Sample X 100 <br /> Spike Conc.Added <br /> Relative%Difference: Conc.of M.S.-Conc.of M.S.D. X 100 <br /> B <br /> Srkm A 0an (Conc.of M.S. + Conc.of M.S.D.)/2 <br /> Project Manager 9113618.WAT <2> <br />