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j 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 #6100, Tracy, CA <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention David Stavarek OC Sample Group 1100087-96 Reported Oct 21, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethyl benzene Xylenes <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppm ppm ppm ppm <br /> Date Analyzed Oct 14, 1991 Oct 14, 1991 Oct 14, 1991 Oct 14, 1991 <br /> OC Sample # 110-0092 110-0092 110-0092 110-0092 <br /> Sample Conc.: N D N D N D ND <br /> Spike Cone. <br /> Added. 020 020 020 040 <br /> Cone Matrix <br /> Spike: 014 015 016 032 <br /> Matrix Spike <br /> % Recovery- 72 76 78 80 <br /> I Cone. Matrix <br /> Spike Dup.: 015 016 016 033 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 74 78 80 82 <br /> Relative <br /> %Difference: 27 26 25 31 <br /> 1 <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> 41Spike <br /> 'l ����'�-f' Cone Added <br /> Relative%Difference Conc of M S -Cone of M S 0 x 100 <br /> r Michael R Giles (Cone of M S + Cone of M S D) 2 <br /> Laboratory Director 1100087 APR <2> <br />