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= LABORATORIES, INC. <br /> Herst Associates - Project: Misc. Samples Reported: 08/06/2007 11:10 <br /> 4630 South Highway 94 North Outer Road Project Number: NCYC <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 /> Carbon disulfide BQH0144 BQH0144-BLK1 ND ug/L 1.0 0.24 <br /> trans-1,4-Dichloro-2-butene BQH0144 BQH0144-BLK1 ND ug/L 5.0 2.0 <br /> Diisopropyl ether BQH0144 BQH0144-BLK1 ND ug/L 0.50 0.34 <br /> Ethanol BQH0144 BQH0144-BLK1 ND ug/L 250 57 <br /> Ethyl t-butyl ether BQH0144 BQH0144-BLK1 ND ug/L 0.50 0.32 <br /> 2-Hexanone BQH0144 BQH0144-BLK1 ND ug/L 20 2.2 <br /> Methyl ethyl ketone BQH0144 BQH0144-BLK1 ND ug/L 10 3.4 <br /> Methyl iodide BQH0144 BQH0144-BLK1 ND ug/L 2.0 0.33 <br /> Methyl isobutyl ketone BQH0144 BQH0144-BLK1 ND ug/L 10 3.6 <br /> Vinyl acetate BQH0144 BQH0144-BLK1 ND ug/L 10 4.7 <br /> 1,2-Dichloroethane-d4(Surrogate) BQH0144 BQH0144-BLK1 96.1 % 76-114 (LCL-UCL) <br /> Toluene-d8(Surrogate) BQH0144 BQH0144-BLK1 97.0 % 88-110 (LCL-UCL) <br /> 4-Bromofluorobenzene(Surrogate) BQH0144 BQH0144-BLK1 98.6 % 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 party interpretation. Page 31 of 32 <br /> !� ® M ® M100 40Wou4JWerS JWA�M•(617-4SJWAX I"3271M•wl"labsift <br />