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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 • FAX (415) 364-9233 <br /> ": .1..,. <br /> Waterwork Client Project ID: #490, Thorpe /Weber Ave. <br /> 1710 Main Street <br /> Escalon, CA 95320 P: 1041931-1934 Group: Reported: Apr 25 1991 <br /> Attention: Bill Channell QC Sa <br /> P P <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 Cone. <br /> Added: 0.40 0.40 0.40 1.2 <br /> Cone. Matrix <br /> Spike: 0.40 0.36 0.35 1.1 <br /> Matrix Spike <br /> % Recovery: 100 90 88 92 <br /> Cone. 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 /> SE/QII JA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of Sample x 100 <br /> 6 � Spike Conc.Added <br /> LLC� CIC Relative%Difference: Conc.of M.S.-Conc.of M.S D. x 100 <br /> E abeth W. Hac (Conc.of M.S. + Conc.of M.S.D.)/2 <br /> 1041931.WAT <3> <br /> oject Manager <br />