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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 /> RESNA Industries Client Project ID Arco #213 <br /> 1 0, Stockton <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 _ <br /> Attention Matthew Taylor OC Sample Group 2120687-700 Reported Dec 30, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANA i,YTE <br /> Benzene Toluene Ethyibenzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst Chiaravallotf Chiaravailoti Chiaravalloti Chiaravalloti <br /> Reporting Units p9/L u9/L Y9/L ug/L <br /> Date Analyzed Dec 28, 1992 Dec 28, 1992 Dec 28, 1992 Dec 28, 1992 <br /> QC Sample# BLK122892 BLK122892 BLK122892 BLK122892 <br /> Sample Conc. N D N D N D N D <br /> Spike Conc. <br /> Added: 10 10 10 20 <br /> Conc, Matrix <br /> Spike: 87 91 90 17 <br /> Mabu Spike <br /> %Recovery* 87 91 90 85 <br /> Conc. Matrix <br /> Spike Dup . 88 92 92 17 <br /> Matnx Spike <br /> Duplicate <br /> % Recovery 88 92 92 85 <br /> Relative <br /> % Difference 1 1 1 1 22 00 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br />. SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sampie x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D <br /> Michael R Giles (Conc of M S + Conc of M S D)/2 x 100 <br /> Laboratory Director <br /> 2120687 RES c 4 n <br />