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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 #30003-8,Arco, Stockton <br /> 3164 Gold Camp Dr, Sude 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Matthew Taylor OC Sample Group 2100314-19 Reported Oct 16, 1992 <br /> v <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethytbenzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chiaravalloti Chiaravalloti Chiaravalloti Chiaravalloti <br /> Reporting Unds mg/m3 mg/m3 mg/m3 mg/m3 <br /> Date Analyzed Oct 13, 1992 Oct 13, 1992 Oct 13, 1992 Oct 13, 1992 <br /> QC Sample# 13LK101392 BLK101392 BLK101392 BLK101392 <br /> Sample Conc • N D N D N D N D <br /> Spike Conc. <br /> Added, 20 20 20 40 <br /> Conc. Matrix <br /> Spike. 16 16 16 35 <br /> Matrix Spike <br /> % Recovery 80 80 80 88 <br /> Conc Matrix <br /> Spike Dup . 1 6 1 7 17 38 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery 80 85 85 95 <br /> Relative <br /> % Difference: 00 61 61 82 <br /> 01SEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Cana Added <br /> Reiahve%Difference Cone of M S -Cone of MSD x 100 <br /> Michael R Giles (Cone of M S + Cone of M S D)/2 <br /> Laboratory Director <br /> 2100314 RES c2> <br />