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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 OC Sample Group 112-0543 Reported Dec 26, 1991 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> 1 ANALYTE Ethyl- <br /> Benzene To3uene 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 # 1120439 1120439 112-0439 1120439 1120488 <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 018 0 18 019 039 43 <br /> Matrix Spike <br /> % Recovery 90 90 95 98 86 <br /> Cone. Matrix <br /> Spike Dup . 019 0 2 021 042 42 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 95 100 100 100 84 <br /> Relative <br /> % Difference 5 4 10 10 74 2 4 <br /> a <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S Conc of Sample x 100 <br /> ` e Spike Conc Added <br /> Relative°6 Difference Conc of M S -Conc of M S D X100 <br /> Michael R Giles (Corso of M S + Conc of M S 0 1 2 <br /> Laboratory Director 1120543 RES <3> <br />