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, <br /> SEQUOIA ANALYTICAL <br /> + 1900 Bates Avenue a Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686.9689 <br /> 0 <br /> }'Alton Geoscience Client Project ID: Mobil X04-343/30-0136-01 <br /> 4 5870 Stoneridge Drive, Suite 6 <br /> Pleasanton, CA 94588 <br /> Attention: Stephan Rosen OC Sample Group: 2020874-881 Reported: Mar 3, 1992 <br /> DUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene X encs Diesel <br /> EPA EPA EPA EPA <br /> Method: 80/5/8020 6015/8020 8015/8020 8015/8020 EPAS015 <br /> Analyst: K.E. K.E. K.E. K.E. A.Twon <br /> Reporting Units: uq/L uq/L uq/L ug/L ug/L <br /> Date Analyzed: Feb 25, 1992 Feb 25, 1992 Feb 25, 1992 Feb 25, 1992 Mar 2, 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 Conc. <br /> Added: 20 300 <br /> Conc. Matrix <br /> Spike: 22 21 22 69 270 <br /> Matrix Spike <br /> % Recovery: 110 105 110 115 91 <br /> Conc. Matrix <br /> Spike Dup.: 20 20 21 65 260 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 100 100 105 108 87 <br /> Relative <br /> % Difference: 9.5 4.8 4.6 6.0 4.1 <br /> SEQUOIA ANALYTICAL %Recoverjr Conc.of M.S.-Conc.of Sample x 100 <br /> 0 Spike Conc.Added <br /> Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> Cott A. f] (Cone.of M.S. + Conc.of M.S.D.) 2 <br /> Project Manager <br /> 2020874.ALT c3> <br />