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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 1D 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 /> r <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Chloro- Chloro- <br /> 1,1-Dichloroethene Trichloroethene benzene Benzene 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 pg/kg pg/kg p9/kg p9/k9 p9/k9 pg/k9 <br /> Date Analyzed Nov 22, 1991 Nov 22 1991 Nov 22 1991 Nov 22, 1991 Nov 22, 1991 Nov 22, 1991 <br /> QC Sample# BLK112291 BLK112291 BLK112291 BLK112291 BLK112291 BLK112291 <br /> MS/MSD MS/MSD MS/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 97 11 10 93 99 <br /> I <br /> Matrix Spike <br /> % Recovery 130 97 110 100 93 99 <br /> i Conc Matrix <br /> Spike Dup 13 10 11 10 92 91 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery. 130 100 110 100 92 91 <br /> Relative <br /> %Difference 00 30 00 00 1 1 84 <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 /> !r} � <br /> Spike Conc Added <br /> +`/�_] r� Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Rick R DlMaio (Conc of M S + Conc of M S D)/2 <br /> Project Manager — <br /> 1110572 RES <br />