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6 <br /> SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> ..<RESNA Industries Client Project ID: Arco #2076, Lodi <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> 'Attention: Eloise Cherven CSC Sample Group: 1110672-81 Reported: Nov 26, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Lead r3enzene Toluene Ethyl benzene Xylenes <br /> Method: EPA 6010 EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: S. Foster C. Chapman C.Chapman C.Chapman C.Chapman <br /> Reporting Units: mg/kg PPM cPm Ppm CP M <br /> Date Analyzed: Nov 22, 1991 Nov 24. 1991 Nov 24. 1991 Nov 24, 1991 Nov 24. 1991 <br /> CC Sample #: 111-0672 111-0695 111-0695 111-0695 111-0695 <br /> Sample Conc.: 11 N.D. N.D. N.D. N.D. <br /> Spike Conc. <br /> Added: 250 0.20 0.20 0.20 0.40 <br /> Conc. Matrix <br /> Spike: 230 0.17 0.17 0.17 0.36 <br /> Matrix Spike <br /> % Recovery: 88 85 85 85 90 <br /> Conc. Matrix <br /> Spike Dup.: 230 0.18 0.19 0.18 0.37 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 88 90 95 90 92 <br /> Relative <br /> % Difference: 0.0 1.1 3.4 2.3 2.2 <br /> Quality Assurance Statement: All standard operating procedures and quality control requirements have been met. <br /> SEQUOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of Samoie x 100 <br /> Spike Conc.Added <br /> Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> Rick R. DiMaio Conc.of M.S. + Conc.of M.S.D.) /2 <br /> Project Manager 1110672.RES <7> <br />