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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue 9 Suite LM e Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> 010-.0 <br /> R.24011 Stanwell Drive, Suite 400 <br /> 'Concord,CA 94520 <br /> Attention: Mardo Kapreallan, P.E. -40 Reported: Oct 20, 1992 <br /> OC Sample Group: 2100396 4 <br /> ' <br /> •-4'n <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> EPA EPA EPA EPA <br /> Method: 8015/8020 8015/8024 8015/8020 8015/8020 <br /> Analyst: J.F. J.F. J.F. J.F. <br /> Reporting Units: lig/L pg/L erg/I- pg/L <br /> Date Analyzed: Oct 14, 1992 Oct 14, 1992 Oct 14, 1992 Oct 14, 1992 <br /> OC Sample#: Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Cone.: N.D. N.D. N.D. N.D. <br /> Spike Cone. <br /> Added: 20 20 20 60 <br /> Cone. Matrix <br /> Spike: 22 21 22 65 <br /> Matrix Spike <br /> % Recovery: 110 105 110 108 <br /> Cone. Matrix <br /> Spike Dup.: 24 22 23 67 <br /> Matrix Spike <br /> Duplicate <br /> • Recovery: 120 110 115 112 <br /> Relative <br /> • Difference: 8.6 4.6 4.4 4.5 <br /> Laboratory Blank contained the following anatytes., None detected. <br /> SEQUOIA ANALYTICAL %Plecovery, 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 /> cott A. hieffo (Cone.of M.S. + Conc.of M.S.D.) 2 <br /> Ae <br /> Project Manager 2100396.KEI <3> <br />