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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 * Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> ................................ <br /> .......... <br /> ..'.ERM-West ..... <br /> Client Project ID: Saieway-Stockton <br /> <2001 P Street, Suite 200 <br /> .-Sacramento, CA 95814 <br /> ...'Attention: Bill Spong OC Sample Group: 2020579-81 Reported- Mar 13, 11992" <br /> ... ........................ <br /> ................. <br /> ........................ <br /> .............. ... ...... <br /> ....................... <br /> .. ..... .... <br /> ......................... <br /> . ............. <br /> . ........... <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> Method: EPA 8020 EPA-8020 EPA 8020 EPA 8020 EPA <br /> 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, 1.992 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: 8.3 8.6 8.6 17 530 <br /> li <br /> Matrix Spike <br /> %Recovery: 83 86 86 85 88 <br /> Conc. Matrix <br /> Spike Dup.: 9 9.4 <br /> 9.4 19 580 <br /> Matrix Spike <br /> 'Duplicate <br /> % Recovery: 90 <br /> 94 94 95 97 <br /> Relative <br /> */o Difference: 8.1 8.9 8.9 11 9 <br /> SEQUOIA ANALYTICAL %Recovery: Cone.of M.S.-Conc.of Sample X 100 <br /> Spike Conc.Added <br /> Relative%Difference: <br /> Conc.of M.S.-Conc.of M.S.D. X 100 <br /> Michael R. Giles (Conc.of M.S. + Conc.of KS.D.) 2 <br /> Laboratory Director - <br /> 2020579.ERS <4> <br />