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Herst Associates Project: Misc.Samples Reported: 05/23/2007 13:28 <br /> 4630 South Highway 94 North Outer Road Project Number: NCYC Tank Samples <br /> North Outer Rd. Project Manager: David Vasbinder <br /> Saint Charles,MO 63304 <br /> Volatile Organic Analysis (EPA Method 8260) <br /> Quality Control Report - Method Blank Analysis <br /> Constituent Batch ID QC Sample ID MB Result Units PQL MDL Lab Quals <br /> Styrene BQE1046 BQE1046-BLK1 ND ug/L 0.50 0.15 <br /> 1,1,2,2-Tetrachloroethane BQE1046 BQE1046-BLK1 ND ug/L 0.50 0.22 <br /> Tetrachloroethene BQE1046 BQE1046-BLK1 ND ug/L 0.50 0.11 <br /> Toluene BQE1046 BQE1046-BLK1 ND ug/L 0.50 0.12 <br /> 1,2,4-Trichlorobenzene BQE1046 BQE1046-BLK1 ND ug/L 0.50 0.18 <br /> 1,1,1-Trichloroethane BQE1046 BQE1046-BLK1 ND ug/L 0.50 0.27 <br /> 1,1,2-Trichloroethane BQE1046 BQE1046-BLK1 ND ug/L 0.50 0.12 <br /> Trichloroethene BQE1046 BQE1046-BLK1 ND ug/L 0.50 0.13 <br /> Trichlorofluoromethane BQE1046 BQE1046-BLK1 No ug/L 0.50 0.14 <br /> 1,2,3-Trichloropropane BQE1046 BQE1046-BLK1 ND ug/L 1.0 0.42 <br /> Vinyl chloride BQE1046 BQE1046-BLK1 ND ug/L 0.50 0.14 <br /> Total Xylenes BQE1046 BQE1046-BLK1 ND ug/L 0.50 0.31 <br /> Acetone BQE1046 BQE1046-BLK1 ND ug/L 10 6.2 <br /> Acrylonitrile BQE1046 BQE1046-BLK1 ND ug/L 5.0 2.0 <br /> t-Amyl Methyl ether BQE1046 BQE1046-BLK1 ND ug/L 0.50 0.34 <br /> t-Butyl alcohol BQE1046 BQE1046-BLK1 ND ug/L 10 9.3 <br /> Carbon disulfide BQE1046 BQE1046-BLK1 ND ug/L 1.0 0.24 <br /> trans-1,4-Dichloro-2-butene BQE1046 BQE1046-BLK1 ND ug/L 5.0 0.80 <br /> Diisopropyl ether BQE1046 BQE1046-BLK1 ND ug/L 0.50 0.34 <br /> Ethanol BQE1046 BQE1046-BLK1 ND ug/L 250 57 <br /> Ethyl t-butyl ether BQE1046 BQE1046-BLK1 ND ug/L 0.50 0.32 <br /> 2-Hexanone BQE1046 BQE1046-BLK1 ND ug/L 20 1.7 <br /> Methyl ethyl ketone BQE1046 BQE1046-BLK1 ND ug/L 10 3.4 <br /> Methyl iodide BQE1046 BQE1046-BLK1 ND ug/L 2.0 0.31 <br /> BC Laboratories The results in this report apply to the samples analyzed in accordance with the chain of custody document.This analytical report must be reproduced in its entirety. <br /> Page 35 of 37 <br />