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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite S + Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> RESNA,Irid ustnes' Client Project ID Arco#6100,Tracy "' n <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention David Stavarek CSC Sample Group 1110730-44 Reported Dec 11, 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 /> i Date Analyzed Dec 5, 1991 Dec 5, 1991 Dec 5, 1991 Dec 5, 1991 <br /> OC Sample# 111-0733 111-0733 111-0733 111-0733 <br /> Sample Cone.: N D N D N D N D <br /> Spike Cone. <br /> Added: 020 0 20 020 040 <br /> Cone. Matrix <br /> Spike: 024 024 024 049 <br /> Matrix Spike <br /> % Recovery- 120 120 120 120 <br /> Cone. Matrix <br /> Spike Dup.: 023 023 023 047 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 120 120 120 120 <br /> i <br /> Relative <br /> % Difference: 43 43 43 42 <br /> i <br />• SEQUOIA ANALYTICAL %Recovery- Cone of M S -Cone of Sample x 100 <br /> � Spike Cone Added <br /> 1k&11E( Relative%Difference Cone of M S -Cone of M S D X100 <br /> i Michael R Giles (Conc of MS + Cone of MSD)42 <br /> Laboratory Director 1110730 RES <5> <br />