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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> .:Waterwork Clint Project Ip: #490, Thorpe /Webor Ave. <br /> €:1710 Main Street <br /> Escalon, CA 95320 <br /> Attention: Bill Channell QC Sample Group: 1041933-1934 Reported Apr 25, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Trichloro- Chloro- <br /> 1,1-Dichloroethene ethene benzene <br /> Method: EPA 8010 EPA 8010 EPA 8010 <br /> Analyst: E.Hamilton E. Hamilton E.Hamilton <br /> Reporting Units: ug/kg erg/kg pg/kg <br /> Date Analyzed: Apr 18, 1991 Apr 18, 1991 Apr 18, 1991 <br /> OC Sample#: Matrix Matrix Matrix <br /> Sample Cone.: N.D. N.D. N.D. <br /> Spike Conc. <br /> Added: 10 10 10 <br /> Conc. Matrix <br /> Spike: 9.9 10 11 <br /> Matrix Spike <br /> %a Recovery: 99 100 110 <br /> Conc. Matrix <br /> Spike Dup.: 8.5 10 11 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 85 100 110 <br /> Relative <br /> % Difference: 15 0.0 0.0 <br /> SE IA ANALYTICA ti %Recovery: Conc.of M.S.-Conc.of Sample x 100 <br /> Spike Conn Added <br /> f Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> Ii abeth W. Hackl {Conc.of M.S. + Conc.of M.S.D.)/2 <br /> P jest Manager 1041931.WAT <9> <br />