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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 Arco #2076, Lodi <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Frick QC Sample Group 1110807-08 Reported Dec 9, 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 6, 1991 Dec 6 1991 Dec 6 1991 Dec 6, 1991 <br /> QC Sample # 111-0739 111-0739 111-0739 111 0739 <br /> Sample Cone N D N D N D N D <br /> e • Spike Cone <br /> Added 020 020 020 040 <br /> Cone Matrix <br /> Spike 017 017 017 036 <br /> 1 <br /> Matrix Spike <br /> % Recovery 85 85 85 90 <br /> t Cork Matrix <br /> Spike Dup 017 017 017 034 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 85 85 85 85 <br /> Relative <br /> % Difference 00 00 00 57 <br /> SEQUOIA ANALYTICAL % Recovery Conc of M S Cone of Sample x 100 <br /> Spike Conc Added <br /> ` Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Rick R DiMaio (Conc of M S t Conc of MSD)/2-- <br /> Project Manager 1110807 RES <2> <br />