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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue - Suite LM , Concord, California 94520 <br /> Jr (510) 686-9600 FAX (510) 686-9689 <br /> . ........... <br /> *- Engineering Science&Tech. 'Client Project ID: Arco -05481 EA-92-2 <br /> -A Lafayette Circle Method (units): EPA 8240 (pg/L purged) Q.C. Sample Dates <br /> -Lafayette, CA 94549 Analyst(s): G.M. <br /> :Attention: Brian Thomas QC Sample #: Matrix Blank Analyzed: Mar 24, 1992 <br /> Reported: Mar 26, 1992 <br /> ... ............. <br /> ......... <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 39 78 14 <br /> ethene <br /> Trichloroethene N.D. 50 43 86 39 78 9.8 <br /> Benzene N.D. 50 44 88 39 78 12 <br /> Ppoluene N.D. 50 45 90 40 80 12 <br /> ', Chlorobenzene N.D. 50 43 86 39 78 9.8 <br /> ISQUOIA ANALYTICAL 96 Recovery: Conc.of M.S.-Conc.of Sample X 100 <br /> Spike Conc.Added <br /> Relative%Difference: Conc.of M.S.-Conc.of M.S.D. X 100 <br /> S ott A. Chieff o (Cone.of M.S. + Conc.of M.S.D.)/2 <br /> 4��_�a, �24_ <br /> Project Manager 2031135.EEE <5> <br />