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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite S • Sacramento, CA 95834 <br />. (916) 921-9600 • FAX (916) 921-0100 <br /> ERM-West Client Project ID Atchison,Topeka,and Santa Fe Railway Co <br /> 2001 P Street, Suite 200 <br /> Sacramento, CA 95814 <br /> Attention Shannon Sadler QC Sample Group 2020576-78 Reported Mar 13, 1992 <br /> 1 Sir rv4 V{ <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> EPA <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 8015 Mod <br /> Analyst C Chapman C Chapman C Chapman C Chapman M Giles <br /> Reporting Units ppb ppb ppb ppb ppb <br /> Date Analyzed Mar 11, 1992 Mar 11, 1992 Mar 11, 1992 Mar 11, 1992 Mar 5, 1992 <br /> OC Sample # 202-0576 202-0576 202-0576 202-0576 BLK030492 <br /> Sample Conc N D N D N D N D N D <br /> Spike Conc <br /> Added 10 10 10 20 600 <br /> Conc. Matrix <br /> Spike: 83 86 86 17 530 <br /> Matrix Spike <br /> % Recovery 83 86 86 85 88 <br /> Conc. Matrix <br /> Spike Dup. 9 94 94 19 580 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 90 94 94 95 97 <br /> Relative <br /> % Difference 81 89 89 11 9 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> f r q��✓�� Spike Cann Addeo <br /> /�/ C/�� Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Michael R Giles (Conc of MS + Conc of MSD)/2 <br /> Laboratory Director <br /> 2020576 ERS 43> <br />