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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 Industries Client Project ID: Arco #2076, Lodi <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention: Eloise Cherven QC Sample Group: 1110672-81 Reported: Nov 26, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Chloro- Chloro- <br /> 1.1-Dichloroetnene Trichloroethene oenzene Eenzene Toluene benzene (PID) <br /> Method: EPA 601 EPA 601 EPA 601 EPA 602 EPA 602 EPA 602 <br /> Analyst: M. Nguyen M.Nguyen M. Nguyen M. Nguyen M. Nguyen M. Nguyen <br /> Reporting Units: N9/kg r%9/k9 --9i k9 4g/k9 p9/kg J9/k9 <br /> Date Analyzed: Nov 22, 1991 Nov 22. 1991 Nov 22, 1991 Nov 22, 1991 Nov 22. 1991 Nov 22. 1991 <br /> OC Sample #: BLK112291 BLK112291 6LK112291 BLK112291 BLK112291 BLK112291 <br /> MS/MSD MS/MSD '.1S/MSD MS/MSD MS/MSD MS/MSD <br /> Sample Conc.: N.D. N.D. N.D. N.D. N.D. N.D. <br /> Spike Conc. <br /> Added: 10 10 10 10 10 10 <br /> Conc. Matrix <br /> Spike: 13 9.7 11 10 9.3 9.9 <br /> Matrix Spike <br /> % Recovery: 130 97 110 100 93 99 <br /> Conc. Matrix <br /> Spike Dup.: 13 10 11 10 9.2 9.1 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 130 100 110 100 92 91 <br /> Relative <br /> % Difference: 0.0 3.0 0.0 0.0 1.1 3.4 <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 /> 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 <8> <br />