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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 - Sacramento, CA 95834 <br /> (916) 921-9600 - FAX (916) 921 0100 <br /> l <br /> RESNA Industries Client Project 0 Arco #6100, Tracy <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention David Stavarek QC Sample Group 1110845-55 Reported Dec 13, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> I ANALYTE Ethyl- <br /> Benzere To!Lene 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 Chiaravailab <br /> Reporting Units ppm ppm ppm ppm mg/kg <br /> I Date Analyzed Dec 10, 1991 Dec 10 1991 Dec 10, 1991 Dec 10 1991 Dec 4, 1991 <br /> QC Sample # 111-0855 111-0855 111-0855 111-0855 111-0810 <br /> Sample Cone : N D N D N D N D 34 <br /> i. <br /> Spike Cone <br /> Added- 020 020 020 040 63 <br /> Cone. Matrix <br /> Spike 018 0 18 017 036 98 <br /> Matrix Spike <br /> % Recovery- 90 90 85 90 100 <br /> I Cone. Matrix <br /> Spike Dup : 017 017 017 036 98 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery- 85 85 85 90 100 <br /> Relative <br /> %Difference: 57 57 00 00 00 <br /> I. <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> G , � Spike Conc Added <br /> G <br /> Relative%Difference Conc of MS -Cone of M S D x 100 <br /> Michael R Giles (Conc of M S + Conc of M S D)/2 110845 RES <4> <br /> Laboratory Director <br />