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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 3649233 <br /> :Vllaterwork Client Project ID: #490, Thorpe/Weber Ave. <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Attention: Bill Channell QC Sample Group 1041931-1934 Reported Apr 25 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8015/8020 EPA 8015/8020 PA 8015/802 PA 8015/8020 <br /> Analyst: J.Fontecha J.Fontecha J. Fontecha J, Fontecha <br /> Reporting Units: ppm ppm ppm ppm <br /> Date Analyzed: Apr 20, 1991 Apr 20, 1991 Apr 20, 1991 Apr 20, 1991 <br /> QC Sample #: Matrix Matrix Matrix Matrix <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> Spike Conc. <br /> Added: 0,40 0.40 0.40 1.2 <br /> Conc. Matrix <br /> Spike: 0.40 0.36 0.35 1.1 <br /> Matrix Spike <br /> % Recovery: 100 90 88 92 <br /> Conc. Matrix <br /> Spike Dup.: 0.44 0.41 0.38 1.2 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 110 100 95 100 <br /> Relative <br /> % Difference: 9.5 13 8.2 8.7 <br /> SEQUQIA ANALYTICAL Recovery: Conc.of M.S.-Conc.of Sample x 100 <br /> f Spike Conc,Added <br /> ( + Relative%Difference: Conc.of M.S,-Conc,of M.S.D. x 100 <br /> Pzabeth W. HaC (Conc.of M.S. + Conc.of M,S.D.)/2 <br /> oject Manager 1041931.WAT <3> <br />