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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 e Sacramento CA 95834 <br /> (916) 921 9600 e FAX (916) 921-0100 <br /> RESNA Industries Client Project 1D Arco #2130, Stockton <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova CA 95670 <br /> Attention Eloise Frick QC Sample Group 112-0543 deported Dec 26, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyi- <br /> Benzene Totuene Benzene Xylenes Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010 <br /> Analyst C Chapman C Chapman C Chapman C Chapman S Foster <br /> Reporting Units ppm ppm ppm ppm mg/kg <br /> Date Analyzed Dec 20 1991 Dec 20, 1991 Dec 20 1991 Dec 20, 1991 Dec 26 1991 <br /> QC Sample # 112-0439 1120439 1120439 112-0439 1120488 <br /> Sample Cone N D N D N D N D N D <br /> Spike Cone <br /> Added 0 2 0 2 0 2 04 50 <br /> Cone. Matrix <br /> Spike 018 0 18 0 19 039 43 <br /> Matrix Spike <br /> % Recovery 90 90 95 98 86 <br /> Cone Matrix <br /> Spike Dup 019 02 021 042 42 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 95 100 100 100 84 <br /> Relative <br /> % Difference 54 10 10 74 24 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S Cone of Samoie x 100 <br /> Spike Conc Added <br /> Clh�f/ ` ' Relative`% Difference Conc of M S -Cone of M S D x 100 <br /> Michael R Giles tConc of M S + Conc of M S D 1 / 2 <br /> Laboratory Director 1120543 RES <3> <br />