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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364.9600 FAX(415) 364-9233 <br /> Waterwork Client Project ID. City of Stockton, Banner Island <br /> 1710 Main Street Method (units). EPA 8240 (Ng/L purged) O.C. Sample Dates <br /> Escalon, CA 95320 Analyst(s): J. Schwarz <br /> Attention: Bill Channell OC Sample#: 911-1531 Analyzed: Nov 22, 1989 <br /> Reported: Dec 11, 1989 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Conc. Matrix Spike <br /> Conc. Spike Matrix Duplicate Relative <br /> Sample Spike Conc. Matrix % Spike % % <br /> Analyte Conc. Added Spike Recovery Duplicate Recovery Difference <br /> 1,1-Dichloro- N.D. 50 45 90 49 98 8.5 <br /> ethene <br /> Trichloroethene N.D. 50 48 96 51 102 6.1 <br /> Benzene N.D. 50 49 98 51 102 4.0 <br /> Toluene N.D. 50 46 92 53 106 14 <br /> Chlorobenzene N.D. 50 48 96 52 104 8.0 <br /> SEQUOIA ANAL CAL %P&COv": Conc.of M.S.•Conc.of Samoi• x 100 <br /> $p4k•Cone.Atltletl <br /> PW&five%Oiffannce: Cone.of M.S.•Conc.of M.S.O. x 100 <br /> VmA-4iio�mn (Conc.of M.S. • Conc.of M.S.0.1 i 2 <br /> Project Manager 9110M.WAT <9> <br />