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me a. B",ON <br /> r <br /> SEQUOIA ANALYTICAL 4520 <br /> 1900 Sates Avenue - Suite LNI - Concord,Ca i orm, <br /> 15101£Z6.9066 PAX 15101 686.9689 <br /> IM-West(Sacramento) Client Project ID: Catellus•Stockton #1221.07 <br /> 4001 P Streat,Suite 200 <br /> Sacramento,CA 95814 Reported: Sep 27. 1991 <br /> aention: Shannon Sadler QC Sample Group: 1090775.80.1399-400 p. <br /> DUALITY CONTROL DATA REPORT <br /> .NALYTE Ethyl <br /> Senzere Toluene Benzene Xylenes <br /> Method: EPAB015/8020 EPA8015/8020 EPAS015/8020 EPA8015/8024 <br /> R.Halsne R.Halsne R.Halsne <br /> Analyst: A.Halsne L c+g/L <br /> Reporting units: ug/u v9/L ugl <br /> Date Analyzed: Sep 13. 1991 Sep 13, 1991 Sep 13. 1991 Sep 13, 1991 <br /> QC Sample#: MatriK Blank Matrix Btank Matrix Blank Matrix 61ank <br /> Sample Cone.: N.D. N.D. N.D. N.D. <br /> pike Conc. 20 60 <br /> Added: 20 20 <br /> Conc.Matrix 75 <br /> Spike: 23 21 23 <br /> Matrix Spike 120 130 <br /> %Recovery: 120 110 <br /> Conc.Matrix 81 <br /> Spike Dup.: 25 23 25 <br /> Matrix Spike <br /> Duplicate 130 140 / <br /> %Recovery: 130 120 <br /> Relative 7 <br /> %Difference: 8.3 8.3 8.3 <br /> _GUOIA ANALYTICAL- %Recovery: <br /> Ganc.of M.S.-Cone.et Samoie x ttx) <br /> Spike Cone.Actoed <br /> I _ x 100 <br /> Relative%Difference: Cone.nt M.S.•Conc.01 M.S.t). <br /> ���MVVValers ein IConc.of M,5.+CAnc.of M.5.0.}/ : 1�T75.ERS 47> <br /> to] t Manager <br /> --- ,��lntrelln�rm <br />