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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> i <br /> < #�... �ku.. ar..hv.ry. . .,, w°t"3 �,,• z . the k.' 3R ry.,,.. <br /> RESNA IndustnesN Cllerlt Project iD #30003-8, Arco, Stockton <br /> 3164 Gold Camp Dr. Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Matthew Taylor QC Sample Group 2100314-19 Reported Oct 16, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> i ANALYTE <br /> Benzene Toluene Ethylbenzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chlaravallot3 Chiaravallots Chiaravalloti Chiaravalloti <br /> Reporting Units mg/M3 mg/nt' mg/m' mg/ml <br />' Date Analyzed Oct 13, 1992 Oct 13, 1992 Oct 13, 1992 Oct 13, 1992 <br /> OC Sample# BLK101392 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.: 16 1 7 1 7 38 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 80 85 85 95 <br /> Relative <br /> % Difference: 00 61 61 82 <br />. SEQUOIA ANALYTICAL x Recovery Cone of M S -Cone of Sample X 100 <br /> Spike Cone Added <br /> Relative%Difference Conc of M S -Cone of M S D X 100 <br /> Michael R Giles (Cone of M S + Cone of M S D) 2 <br /> Laboratory Director <br /> 2100314 RES <2> <br />