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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> ................ <br /> ......................... <br /> .................... ............ <br /> Canonie Environmental Client Project ID: 91-106-05/Time oii-Lbbi <br /> 7901 Stoneridge Drive, Suite 100 Method (units): EPA 8240 (ugIL purged) O.C. Sample Dates <br /> Pleasanton, CA 94578 Analyst(s): S. Scott <br /> ..Attention: Dave Collett OC Sample#: BLK123091 Analyzed. Dec 31, 1991 <br /> Reported. Jan 8, 1992 <br /> ............ <br /> .. .. ........... <br /> ............. ...... <br /> ................. <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Conc. Matrix Spike <br /> Cone. Spike Matrix Duplicate Relative <br /> Sample Spike Conc. Matrix % Spike <br /> % % <br /> Analyte Cone. Added Spike Recovery Duplicate Recovery Difference <br /> 1,1-Dichloro- N.D. 50 41 82 43 86 4.8 <br /> ethene <br /> Trichloroethene N.D. 50 47 94 49 98 4.2 <br /> Benzene N.D. 50 43 86 45 90 4.5 <br /> Toluene N.D. 50 47 94 49 98 4.2 <br /> Chlorobenzene N.D. 50 48 96 50 100 4.1 <br /> SEQUOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of Sample X 100 <br /> Spike Conc.Added <br /> Relative%Difference: <br /> Conc.of M.S.-Conc.of M.S.D. X 100 <br /> Maile A. Springe\r (Conc.of M.S. + Conc.of M.S.D.) 2 <br /> Project Manager 112301S.CAN <4> <br />