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1 <br /> j SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> 0 (916) 921-9600 • FAX (916) 921-0100 <br /> 1 <br /> -IRESNA 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 1110745-50 Reported Dec 5, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> I 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 /> i Date Analyzed Dec 2, 1991 Dec 2, 1991 Dec 2, 1991 Dec 2 1991 <br /> QC Sample # 111-0422 111-0422 111 0422 111-0422 <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: 00 00 00 00 <br />• SEQUOIA ANALYTICAL %Recovery Cone of M S -Conc of Sample x 100 <br /> ll12 o[ / Spike Conc Added <br /> Relative%Difference Conc of M S -Cone of MSD x 100 <br /> Michael R Giles (Conc of M S + Cone of M S D)/2 <br /> Laboratory Director 1110745 RES <9> <br />