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H � <br /> SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686 9689 <br /> 07S Environmental Associates Client Project ID #305 <br /> P O Box 2242 <br /> Merced, CA 95344 <br /> Attention Kevin Koehn OC Sample Group 2010560-562 Reported Feb 3, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 <br /> Analyst K N KN K N K N <br /> Reporting Units ug/L ug/L ug/L ug/L <br /> Date Analyzed Jan 22 1992 Jan 22 1992 Jan 22 1992 Jan 22 1992 <br /> OC Sample # Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc N D N D N D N D <br /> Spike Conc <br /> Added 20 20 20 60 <br /> Conc Matrix <br /> Spike 22 22 22 71 <br /> Matrix Spike <br /> % Recovery 110 110 110 118 <br /> Conc Matrix <br /> I Spike Dup 19 20 19 63 <br /> C Matrix Spike <br /> Duplicate <br /> %Recovery 95 100 95 105 <br /> Relative <br /> % Difference 5 1 95 5 1 12 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of MS -Cone of M S D x 100 <br /> Scott A Chreffo (Conc of M S + Conc of M S D U 2 <br /> Project Manager <br /> 2010560 ETS <9> <br />