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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 #6100, Tracy <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention David Stavarek OC Sampte Group 111-0844 Reported Dec 3, 1991 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> 1 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 2, 1991 Dec 2 1991 Dec 2 1991 Dec 2 1991 <br /> QC Sample # 111-0422 1110422 111-0422 1110422 <br /> Sample Cone N D N D N D N D <br /> 1. <br /> Spike Cone <br /> Added- 020 020 020 040 <br /> Cone Matrix <br /> I Spike 019 019 019 039 <br /> Matrix Spike <br /> % Recovery 95 95 95 98 <br /> 1 Conc Matrix <br /> Spike Dup 019 019 019 039 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 95 95 95 98 <br /> 1 <br /> Relative <br /> % Difference: 21 1 1 1 1 21 <br /> Duality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> 1� <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> tickR <br /> �� Relative%Difference Conc of M S -Conc of M S D x 100 <br /> D€Maio (Conc of M S + Conc of M S D) /2 <br /> Project Manager 1110844 RES <2> <br />