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SEQUOIA- ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br />{ (415) 364-9600 FAX (415) 364-9233 Ifi <br /> aterwork Client Project ID: #490, Thorpe/Weber Ave <br /> 1710 Main Street <br /> €:E l <br /> s n <br /> 5 2 <br /> _« Cao CA s30 ; <br /> I <br /> ,.-...Attention.* it nn I <br /> Bill Ch <br /> :a.. a e I CC Sample Group: 1041931-1934 � ;� Reported: Apr 25, 1991 } <br /> j I`pr <br />! ' I <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl �x <br /> i <br /> Benzene Toluene Benzene Xylenes E <br /> s � <br /> Method: EPA 8015/8020 EPA 8015/8020 PA 8015/802 PA 8015/8020 <br />` Analyst: J.Fontecha J.Fontecha J.Fontecha J.Fontecha l <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 Matri <br /> ix I <br /> � I <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> Spike Conc. f <br /> Added: 0.40 0.40 0.40 1.2 ' <br /> Conc. Matrix i4 <br /> Spike: 0.40 0.36 0.35 <br /> Matrix Spike 3 <br /> E % Recovery: 100 90 88 92', F <br /> Conc, Matrix 1 <br /> 1 <br /> Spike Dup.: 0.44 0.41 0.38 1 � <br /> f � i <br /> Matrix Spike I! t <br /> Duplicate <br /> %Recovery: 110 100 95 100 <br /> Relative <br /> % Difference: 9.5 13 8.2 <br /> SEQUOIA ANALYTICAL Recovery: Conc.of M.S.-Conc.of Sample x 100 <br /> Spike Conc.Added <br /> f <br /> Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> E zabeth W. Hac (Conc.of M.S. + Conc.of M.S.D.)/2 <br /> oject Manager 1 1041931.WAT <3> <br />