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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue * Suite LM a Concord, California 94520 <br /> (415) 686-9600 a FAX (415) 686-9689 <br /> Alton Geoscience Client Project ID: 30-13"1 <br /> 1000 Burnett St., #140 <br /> Concord, CA 94520 <br />` Attention: Tridib Guha OC Sample Group: 1081123-30 Reported Aug 29, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE EthYI- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA8015/8020 EPA8015/8020 EPA8015/8020 EPA8015/8020 <br /> Analyst: RH/JF RX/JF RH/JF RH/JF <br /> Reporting Units: pro/L pa/L ug/L Pg/L <br /> Date Analyzed: Aug 2s, 1991 Aug 28, 1991 Aug 28. 1991 Aug 28, 1991 <br /> QC Sample #: BLK082891 BL3{082891 BLK08MI OL.K082891 <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> pike Conc. <br /> Added: 20 20 20 60 <br /> Conc. Matrix <br /> Spike: 20 20 20 62 <br /> Matrix Spike <br /> % Recovery: 100 100 100 100 <br /> Conc. Matrix <br /> Spike Dup.: 21 20 21 65 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 110 100 110 110 <br /> Relative <br /> % Difference: 4.9 0 4.9 4.7 <br /> 4— EQUOIA ANALYTICA %Recovery. Conc.of M.S.-Conc.of x 100 <br /> Spike Conc.Added <br /> Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> ! J la R. erstein XZ=�� <br /> Conc.of M.S. + Conc.of M.S.D. 2 <br /> oject Manager 1081123.AL0 <4> <br />