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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, CA <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Frick QC Sample Group 1120480-91 Reported Jan 3, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Ethyl- <br /> Benzene Toluene 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 /> I Date Analyzed Dec 31, 1992 Dec 31, 1992 Dec 31, 1992 Dec 31, 1992 Dec 26, 1992 <br /> QC Sample# 112-0556 112-0556 112-0556 112-0556 112-0488 <br /> Sample Cone N D N D N D N D N D <br /> i . Spike Cone <br /> Added 02 02 02 04 50 <br /> Cone. Matrix <br /> Spike- 0 175 0 186 019 0 391 43 <br /> Matrix Spike <br /> % Recovery 88 93 95 98 86 <br /> Cone Matrix <br /> Spike Dup : 0 164 0 175 0 179 037 42 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery- 82 88 90 92 84 <br /> Relative <br /> %Difference: 65 61 6 55 24 <br /> SEQUOIA ANALYTIC41- %Recovery Conc of M S -Conc of Sample x 100 <br /> ( Spike Conc Added <br /> `'G ��+J�l� ✓ 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 1120480 RES <6> <br />