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SEQUOI. .�►LY71CAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> :Waterwork Client Project ID: Mike Lopez ` <br /> . 5 <br /> :1710 Main Street <br /> Escalon, CA 95320 <br /> Attention: C. Battram QC Sample Group: 910-1496 Repor�tW;!0ctt2X--.-M9 <br /> ! S! <br /> 3l'l•-�i�?I�11:'ai?ti:S:•A L1-H''-. <br /> E <br /> Dr 7t::'i 7-f+"...-i7S'I <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Toluene Ethyl Xylenes <br /> Benzene <br /> EPA EPA EPA <br /> Method: 8015/8020 8015/8020 8015/8020 <br /> Analyst: G. Spak G. Spak G. Spak <br /> Reporting Units: mg/kg mg/kg mg/kg <br /> Date Analyzed. Oct 16, 1966 Oct 16, 1969 Oct 16, 1989 <br /> OC Sample #: 910-2118 910-2118 910-2118 <br /> Sample Conc.: N.D. N.D. N.D. <br /> Spike Cone. <br /> Added: 1.0 1.0 3.0 <br /> Cone. Matrix <br /> Spike: 0.64 0.92 2.7 <br /> Matrix Spike <br /> %Recovery: 64 92 90 <br /> Conc. Matrix <br /> Spike Dup.: 0.69 0.97 2.7 . <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 69 97 90 <br /> Relative <br /> % Difference: 7.5 5.3 0.0 <br /> SEQUOIA ANALYTICAL %Recovery: Conc.of M.S.-Cone,of Sample x 100 <br /> Spike Conc.Added <br /> Relative 46 Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br />' l beth W. Hack[ (Conc.of M.S. i Conc.of M.S.D.) /2 <br /> lect Manager <br /> 9101496.WAT c2> <br />