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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue * Suite LM * Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> F <br /> Align Geoscience Client Project ID: Mobil # 03-343 /30-0136 <br /> 5870 Stoneridge Drive, Suite 6 <br /> Pleasanton, CA 94588 <br /> Attention: Stephan Rosen QC Sample Group: 2040144-45 Reported: Apr 6, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> EPA EPA EPA EPA <br /> Method: 8015/8020 8015/8020 8015/8020 8015/8020 EPAS015 <br /> Analyst: K.E. K.E. K.E. K.E. A Tuzon <br /> Reporting Units: mg/kg mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed: Apr 6, 1992 Apr 6, 1992 Apr 6, 1992 Apr 6, 1992 Apr 7, 1992 <br /> OC Sample#: Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Cone.: N.D. N.D. N.D. N.D. N.D. <br /> Spike Cone. <br /> Added: 0.40 0.40 0.40 1.2 10 <br /> Cone. Matrix <br /> Spike: 0.50 0.48 0.47 1.4 8.1 <br /> Matrix Spike <br /> %Recovery: 125 120 118 117 81 <br /> Conc. Matrix <br /> Spike Dup.: 0.50 0.48 0.47 1.4 7.7 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 125 120 118 117 77 <br /> Relative <br /> %Difference: 0.0 0.0 0.0 0.0 5.1 <br /> SEQUOIA ANALYTICAL %Recovery: Conc,or 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 /> A Chiefio (Conc.of M.S. + Conc.of M.S.D.) 2 <br /> Project Manager <br /> 2040144ALT a3> <br />