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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 1120001-02 Reported Dec 3, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method BPA 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 111-0422 111 0422 1110422 <br /> Sample Conc N D N D N D N D <br /> Spike Conc <br /> Added 020 020 020 040 <br /> Conc Matrix <br /> Spike 019 019 019 039 <br /> Matrix Spike <br /> % Recovery 95 95 95 98 <br /> Conc Matrix <br /> Spike Dup 019 019 019 039 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 95 95 95 98 <br /> Relative <br /> % Difference 21 1 1 1 1 21 <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 Sample x 100 <br /> Spike ConcAdded <br /> /uj� Relative% Difference Conc of MS -Conc ofMSD x 100 <br /> Rick R io (Conc of M S + Conc of M S D)/2 <br /> Project Manager 1120001 RES <2> <br />