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` SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> RFSNA Industries Client Project ID Arco #2076, Lodi, CA <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Frick OC Sample Group 1110695-96 <br /> Reported Nov 22, 1991 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Berzene 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 Nov 22, 1991 Nov 22, 1991 Nov 22, 1991 Nov 22, 1991 <br /> QC Sample # 111-0695 111-0695 111-0695 111-0695 <br /> Sample Cone N D N D N D N D <br /> F Spike Cone <br /> Added. 020 020 020 040 <br /> Cone Matrix <br /> Spike 016 016 016 034 <br /> r <br /> Matrix Spike <br /> % Recovery 81 81 80 84 <br /> Conc Matrix <br /> Spike Dup 017 017 017 035 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 84 84 84 88 <br /> Relative <br /> %Difference 3 6 3 6 4 9 4 6 <br /> SEQUOI/A ANALYTI Air % 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 D+Maio (Conc of M S + Conc of M S D) 2 <br /> Project Manager 1110695 RES <2> <br />