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,n. <br /> I ` <br /> SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue a Suite LM • Concord, California 94520 <br /> (415) 686-9600 0 FAX (415) 686-9689 <br /> Alton Geoscience Oient Project ID: 30-136-01 <br /> 1000 Burnett St., #140 <br /> Concord, CA 94520 <br /> Attention Trxiib Guha QC Sample Group: 1081123-30 Reported Aug 29, 1991 <br /> - <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> t)iese! <br /> Method: EPA 8015 <br /> Analyst: A Tuzon <br /> Reporting Units: frg/L <br /> Date Analyzed: Aug 28, 1891 <br /> OC Sample #: BLKOa2391 <br /> Sample Conc: N.D. <br /> Spike Conc. <br /> Added: 300 <br /> Conc. Matrix <br /> Spike: 220 <br /> Matrix Spike <br /> % Recovery: 74 <br /> Conc. Matrix <br /> Spike Dup.: 230 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 77 <br /> Relative <br /> % Difference: 4.0 <br /> -6000IA ANAL CAL %Recovery: Cores.of M.S.-Conn.of Sampf* x 100 <br /> Spike Cone.Added^ <br /> Relative%Differenoo: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> R. Malers Conc.of M.S. + Conc.of M.S.D. 2 <br /> ro]ect Manager 1081123.ALO <7> <br />