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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> RESNA IndustriesClient Project ID: Arco #2076, Lodi <br /> '!':3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> ;Attention: Eloise Frick OC Sample Group: 1110697 702 Reported: Nov 26, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyi- <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 7421 <br /> Analyst: C.Chapman C.Chapman C.Chapman C. Chapman S. Foster <br /> Reporting Units: ppm ppm ppm ppm mg/kg <br /> Date Analyzed: Nov 25, 1991 Nov 25, 1991 Nov 25, 1991 Nov 25, 1991 Nov 25, 1991 <br /> OC Sample #: 111-0378 111-0378 111-0378 111-0378 111-0700 <br /> Sample Conc.: N.D. N.D. N.D. N.D. 23 <br /> Spike Conc. <br /> Added: 0.20 0.20 0.20 0.40 25 <br /> Conc. Matrix <br /> Spike: 0.20 0.19 0.19 0.40 45 <br /> Matrix Spike <br /> % Recovery: 100 95 95 100 88 <br /> Conc. Matrix <br /> Spike Dup.: 0.19 0.19 0.18 0.39 46 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 95 95 90 97 92 <br /> Relative <br /> % Difference: 3.1 3.1 3.2 4.1 2.2 <br /> SEQUOIA ANALYTICAL %Recovery: 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 /> Rick R. DIMalci (Conc.of M.S. + Conc.of M.S.D.)/2 <br /> Project Manager 1110697.RES <5> <br />