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Herst Associates Project: Misc.Samples Reported: 05/23/2007 13:31 <br /> 4630 South Highway 94 North Outer Road Project Number: [none] <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 /> trans-1,4-Dichloro-2-butene BQE1080 BQE1080-BLK1 ND ug/L 5.0 <br /> Diisopropyl ether BQE1080 BQE1080-BLK1 ND ug/L 0.50 <br /> Ethanol BQE1080 BQE1080-BLK1 ND ug/L 250 <br /> Ethyl t-butyl ether BQE1080 BQE1080-BLK1 ND ug/L 0.50 <br /> 2-Hexanone BOE1080 BQE1080-BLK1 ND ug/L 20 <br /> Methyl ethyl ketone BOE1080 BQE1080-BLK1 ND ug/L 10 <br /> Methyl iodide BQE1080 BQE1080-BLK1 ND ug/L 2.0 <br /> Methyl isobutyl ketone BQE1080 BQE1080-BLK1 ND ug/L 10 <br /> Vinyl acetate BQE1080 BQE1080-BLK1 ND ug/L 10 <br /> 1,2-Dichloroethane-d4(Surrogate) BQE1080 BQE1080-BLK1 102 % 76-114 (LCL-UCL) <br /> Toluene-d8(Surrogate) BQE1080 BQE1080-BLK1 96.3 % 88-110 (LCL-UCL) <br /> 4-Bromofluorobenzene(Surrogate) BQE1080 BQE1080-BLK1 100 % 86-115 (LCL-UCL) <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 41 of 42 <br />