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SEQUOlAf ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> EA Engineering Science&Tech. Client Project ID: Arco #548/ EA-92-2 <br /> 41-A Lafayette tt Circle <br /> c <br /> '. f <br /> LaY tt 94549 <br /> Lafayette, C A959 <br /> Attention: Brian Thomas CC Sample Group:..2031135-1136 ReportedMr 26a ..... 1992....................: <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Oil&Grease <br /> Method: EPA 418.1 <br /> Analyst: S.L <br /> Reporting Units: mg/Kg <br /> Date Analyzed: Mar 25, 1992 <br /> OC Sample #: Matrix Blank <br /> Sample Conc.: N.D. <br /> ike Conc. <br /> Added: 50 <br /> Conc. Matrix <br /> Spike: 44 <br /> Matrix Spike <br /> %Recovery: 68 <br /> Conc. Matrix <br /> Spike Dup.: 46 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 92 <br /> Relative <br /> %Difference: 4.4 <br /> GIUOIA ANALYTICAL %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 /> Scott A. Chieffo (Conc.of M.S. + Conc.of M.S.D.)/2 <br /> Project Manager 2031135.E EE <4> <br />