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LABORATORIES, INC. <br /> Herst Associates Project: NCYC Reported: 02/01/2008 12:10 <br /> 4630 South Highway 94 North Outer Road Project Number: [none] <br /> Saint Charles, MO 63304 Project Manager: David Vasbinder <br /> Volatile Organic Analysis (EPA Method 8260) <br /> Quality Control Repo - Method Blank Analysis <br /> Constituent Batch ID QC Sample ID MB Result Units PQL MDL Lab Quals <br /> trans-1,4-Dichloro-2-butene BRA1769 BRA1769-BLK1 <5.0 ug/L 5.0 <br /> Diisopropyl ether BRA1769 BRA1769-BLK1 <0.50 ug/L 0.50 <br /> Ethanol BRA1769 BRA1769-BLK1 <250 ug/L 250 <br /> Ethyl t-butyl ether BRA1769 BRA1769-BLK1 <0.50 ug/L 0.50 <br /> 2-Hexanone BRA1769 BRA1769-BLK1 <10 ug/L 10 <br /> Methyl ethyl ketone BRA1769 BRA1769-BLK1 <10 ug/L 10 <br /> Methyl iodide BRA1769 BRA1769-BLK1 <2.0 ug/L 2.0 <br /> Methyl isobutyl ketone BRA1769 BRA1769-BLK1 <10 ug/L 10 <br /> Vinyl acetate BRA1769 BRA1769-BLK1 <10 ug/L 10 <br /> 1,2-Dichloroethane-d4(Surrogate) BRA1769 BRA1769-BLK1 99.1 % 76-114 (LCL-UCL) <br /> Toluene-d8(Surrogate) BRA1769 BRA1769-BLK1 96.0 % 88-110 (LCL-UCL) <br /> 4-Bromofluorobenzene(Surrogate) BRA1769 BRA1769-BLK1 95.8 % 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 /> All results listed in this report are for the exclusive use of the submitting party.BC Laboratories,Inc.assumes no responsibility for report alteration,separation, detachment or third patty interpretation, page 42 of 43 <br /> 4100 Atlas Court®Bakersfield,CA 93308 •(661)327-4911 •FAX(661)327-1918•www.bclabs.com <br />