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1 4 <br /> SEQUOIAMNALYTICAL M <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> .RESNA Industries Cl'ie'nt,Project ID: Arco #2076, Lodi <br /> ..:3164 Gold Camp Drive, Suite 200 <br /> ''Rancho Cordova, CA 95670 <br /> Attention: Eloise Frick QC Sample Group: 1120001-02 Reported: Dec 3, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: C.Chapman C.Chapman C.Chapman C.Chapman <br /> Reporting Units: ppm ppm ppm ppm <br /> Date Analyzed: Dec 2, 1991 Dec 2, 1991 Dec 2, 1991 Dec 2, 1991 <br /> QC Sample #: 111-0422 111-0422 111-0422 111-0422 <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> Spike Conc. <br /> Added: 0.20 0.20 0.20 0.40 <br /> Conc. Matrix <br /> Spike: 0.19 0.19 0.19 0.39 <br /> Matrix Spike <br /> % Recovery: 95 95 95 98 <br /> Conc. Matrix <br /> Spike Dup.: 0.19 0.19 0.19 0.39 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 95 95 95 98 <br /> Relative <br /> % Difference: 2.1 1.1 1.1 2.1 <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 Sample x 100 <br /> Spike Conc.Added <br /> ��ta� Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> Rick R. (Conc.of M.S. + Conc.of M.S.D.)/2 <br /> Project Manager 1120001.RES <2> <br />