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SEQU011ANALYTICAL <br /> 1900 Bates Avenue • Ute LM I• Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> i <br /> W.W. Irwin Client Project ID:033014.00/Embarcadero, Stockton <br /> P.O. Box 2242 <br /> I <br /> Merced, CA 95344 <br /> a <br /> ?:Attention: Roy Austin OC Sample Group: 206-0650 Reported Jul 1 1992 <br /> l ! <br /> QUALITiCONTROL DATA REPORT <br /> i <br /> ANALYTE <br /> Ethyl- <br /> Benzene Toluene Benzene 1 Xylenes Diesel Lead , <br /> I' EPA EPA.;, EPA EPA <br /> Method: sots/sozo 6015/8020 8015/8020 8015/8020 EPA8015 EPA 7421 <br /> Analyst: J.F. J.F. i J.F. J.F. K.Wimer K.Anderson <br /> Reporting Units: mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed: Jun 16, 1992 Jun 16, 1992 Jun 16, 1992 'Jun 16, 1992 Jun 25, 1992 Jul 1, 1992 <br /> QC Sample #: Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank 206-1037 <br /> i <br /> i <br /> I <br /> Sample Conc.: N.D. N.D. N.D. N.D. N.D. 47 <br /> i <br /> Spike Conc. <br /> j Added: 0.40 0.40 0.40 1.2 10 50 <br /> r <br /> Conc. Matrix <br /> G Spike: 0.39 0.39 0.39 1.3 10.4 95 <br /> Matrix Spike <br /> %Recovery: 98 98 98 108 104 98 <br /> I <br /> Conc. Matrix <br /> Spike Dup.: 0.39 0.39 0.38 1.3 9.8 98 <br /> I <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 98 98 95 108 98 102 <br /> r <br /> Relative <br /> r <br /> % Difference: 0.0 0.0 2.6 0.0 7.9 2.1 <br /> I <br />( SEQUOIA ANALYTICAL %Re�veryi, 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 /> Karen L. Enstrom - (Conc.of M.S. + Conc.of M.S.D.)/2 <br /> Project Manager <br />' I <br />