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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 a Sacramento, CA 95834 <br /> lop (916) 921-9600 • FAX (916) 921-0100 <br /> RESNA Industries Client Project ID Arco #2076, Lodi <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Frick QC Sample Group 1120054-56 Reported Dec 6, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppm ppm ppm ppm <br /> Date Analyzed Dec 5 1991 Dec 5, 1991 Dec 5, 1991 Dec 5 1991 <br /> QC Sample # 112-0054 112-0054 1120054 1120054 <br /> Sample Conc N D N D N D N D <br /> Spike Conc <br /> Added 020 020 020 020 <br /> Conc Matrix <br /> Spike 019 019 019 035 <br /> i <br /> Matrix Spike <br /> % Recovery 95 95 95 88 <br /> i Conc Matrix <br /> Spike Dup 017 016 017 035 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 85 80 85 88 <br /> I <br /> Relative <br /> % Difference 11 17 11 00 <br /> I <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S Conc of M S D x 100 <br /> Michael A Giles (Conc of M S } Conc of M S D) 2 <br /> Laboratory Director 1120054 RES <4> <br />