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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento CA 95834 <br /> (916) 921-9600 + FAX (916) 9210100 <br /> RESNA Industries Client Project ID Arco #6100, Tracy, CA <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention David Stavarek QC Sample Group 1100127-28 Reported Oct 16, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> i ANALYTE <br /> Benzene Toluene Ethyl benzene Xylenes <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> I Reporting Units ppm ppm ppm ppm <br /> Date Analyzed Oct 14, 1991 Oct 14, 1991 Oct 14, 1991 Oct 14, 1991 <br /> QC Sample # 110-0092 110-0092 110-0092 110-0092 <br /> Sample Conc.: N D N D N D N D <br /> I <br /> Spike Conc. <br /> Added 020 020 020 040 <br /> Conc. Matrix <br /> 1 Spike: 014 0 15 016 032 <br /> Matrix Spike <br /> % Recovery- 72 76 78 80 <br /> 1 <br /> Conc. Matrix <br /> Spike Dup . 015 016 016 033 <br /> Matrix Spike <br /> Duplicate <br /> 1 % Recovery: 74 78 80 82 <br /> Relative <br /> %Difference: 27 26 25 31 <br /> 1 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Cone of M S D x 100 <br /> 1 Michael R Giles (Conc of M S + Conc of M S D)/2 <br /> Laboratory Director 11o0tzr RRR <2> <br />