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1 <br /> SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 - Sacramento, CA 95834 <br /> (916) 921-9600 - FAX (916) 921-0100 <br /> 1 <br /> RESNA Industries Client Project ID Arco #2130, Stockton <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Frick CC Sample Group 1120436-44 Reported Dec 26, 1991 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> 1 Benzene Toluene Benzene Xylenes Lead <br /> i <br /> Method EPA 8020 EPA 6020 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 /> i Date Analyzed Dec 19 1991 Dec 19 1991 Dec 19, 1991 Dec 19, 1991 Dec 26, 1991 <br /> OC Sample # BLK121991 BLK121991 BLK121991 BLK121991 112-0488 <br /> Sample Cone . N D N D N D N D N D <br />` Spike Cone <br /> Added 02 02 02 04 50 <br /> Cone Matrix <br /> Spike 0 18 0 19 019 039 43 <br /> Matrix Spike <br /> % Recovery- 90 95 95 98 86 <br /> Cone Matrix <br /> Spike Dup 019 0 2 02 042 42 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 95 100 100 110 84 <br /> Relative <br /> % Difference 54 5 1 5 1 74 24 <br /> iSEQUOIA ANALYTICAL %Recovery Conc of M S Conc of Sample x 100 <br /> 611&X j X Spike Conc Added <br /> (/�' V Relative% Difference Conc of M S Conc of M S D x 100 <br /> Michael R Giles (Conc of MS + Conc of M S D)/2 <br /> Laboratory Director 1120436 RES <4> <br />