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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord. California 94520 <br /> '111111W-P (510) 686.9600 • FAX (510) 686.9689 <br /> Afton Geoscience Client Project ID: Mobil #0343/30-0136-01 <br /> 5870 Stoneridge DrNe, Suite 6 <br /> Pleasanton, CA 94588 <br /> Attention: Stephan Rosen OC Sample Group: 2040232, 2040238 Reported: Apr 9, 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 EPA8015 <br /> Analyst: K.N./K.E./J.F. K.N./K.E./J.F. KN./K.E./J.F. K.N./K.E./J.F. A Tuzon <br /> Reporting Units: pg/t_ pg/L pg/L pg/L pg/L <br /> Date Analyzed: Apr 8, 1992 Apr 8, 1992 Apr 8, 1992 Apr 8, 1992 Apr 8, 1992 <br /> OC Sample#: Matrix Blank Matrix Blank Matrix 81ank Matrix Blank Matrix Blank <br /> Sample Conc: N.D. N.D. N.D. N.D. N.D. <br /> Spike Conc. <br /> Added: 20 20 20 60 300 <br /> Conc. Matrix <br /> Spike: 22 21 21 61 204 <br /> Matrix Spike <br /> % Recovery: 110 105 105 102 68 <br /> Conc. Matrix <br /> Spike Dap.: 23 23 22 66 221 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 115 115 110 110 74 <br /> Relative <br /> % Difference: 4.4 9.1 4.6 7.9 7.8 <br /> SEQUOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of Sample x 100 <br /> Spike Conc.Added <br /> Relative%Difference: Cone.of M.S.-Conc.of M.S.D. x 100 <br /> A ieff0 (Conc.of M.S. + Conc.of M.S-D.)12 <br /> Project Manager <br /> 2040232.ALT <3> <br />