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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 e Sacramento CA 95834 <br /> (916) 921-9600 e FAX (916) 921-0100 <br /> t, RESNA Industries Client Project ID Arco #2130, Stockton <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Frick QC Sample Group 1120585-90 Reported Jan 3, 1992 <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 K Ndl K Ndl K Ndl K Ndl <br /> Reporting Units ppm ppm ppm ppm <br /> Date Analyzed Dec 31 1992 Dec 31 1992 Dec 31 1992 Dec 31, 1992 <br /> CC Sample# Matrix Blank Matnx Blank Matrix Blank Matrix Blank <br /> Sample Conc. N D N D N D N D <br /> Spike Conc. <br /> Added: 0 4 0 4 0 4 1 2 <br /> Conc Matnx <br /> Spike: 0 39 039 042 13 <br /> Matrix Spike <br /> %Recovery* 98 98 105 108 <br /> Conc Matrix <br /> Spike Dup . 04 04 045 13 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery* 100 100 112 108 <br /> Relative <br /> %Difference 25 25 6 9 0 0 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Samole x 100 <br /> r Spike Conc Added <br /> Relative%Difference Conc of M S Conc of M S D x 100 <br /> Michael R Giles (Conc of M S f Conc of M S D y 2 <br /> Laboratory Director <br /> 1120585RE5 <5> <br />