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T.. <br /> SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM a Concord, California 94520 <br /> i (415) 686-9600 a FAX (415) 686-9689 <br /> Alton Geoscience Client Project ID: 30-136-01 <br /> 1000 Bumett St., #140 <br /> Concord, CA 94520 <br /> Attention: Tridib Guha CC Sample Group: 108112330 Reported Aug 29, 1991, <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE EthYI- <br /> Senzene Toluene Benzene Xylenes <br /> Method: EPA8015/802o EPA8015/8= EPA8015/8020 EPA8015/8020 <br /> Artaiyst: J. Dinsay J.Dinsay J.Dinsay J.Dinsay <br /> Reporting Units: Pg/L fro/L Pg/L Pg/L <br /> Date Analyzed: Aug 26, 1991 Aug 26, 1991 Aug 26, 1991 Aug 26, 1991 <br /> OC Sample #: wl-Ko82691 6BLK082691 6BLK082691 6BLKD82691 <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> OSpike Conc. <br /> Added: 100 100 100 300 <br /> Conc. Matrix <br /> Spike: 97 95 100 300 <br /> Matrix Spike <br /> %Recovery: 97 95 100 100 <br /> Conc. Matrix <br /> Spike Dup.: 98 97 99 300 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 98 97 99 100 <br /> Relative <br /> %Difference: 1.0 2.1 1.0 0 <br /> R-OWSEQUOIA ANALYTICAL x Recovery: Conc.of M.S.-Conc.of Sample X too <br /> Spike Conc.Added <br /> lathe%Differenoe: Conc.of M.S.-Conc.of M.S.D. X 100 <br /> (, R. e stein Conc.of M.S. t Conc.of M.S.D.)J2 <br /> Pr 'Jed Manager 1081123." <3> <br />