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Laboratories Inc. <br /> Environmental Testing Laboratory Since 1949 <br /> Hers,Associates Reported: 06/23/2010 12:34 <br /> 4630 South Highway 94 North Outer Road Project: Austin Road/NCYCC Drilling <br /> Saint Charles,MO 63304 Project Number [none <br /> Project Manager: Erin Fanning <br /> Volatile Organic Analysis (EPA Method260) <br /> Quality Control Report - Method Blank Analysis <br /> Constituent OC Sample ID MB Result Units POL MDL Lab Ouals <br /> QC Batch ID: BTF1398 <br /> 1,1,1,2-Tetrachloroethane BTF1398-BLK1 NO ug/L 0.50 0.11 <br /> 1,1,2,2-Tetrachloroethane BTF1398-BLK1 NO ug/L 0.50 0.14 <br /> Tetrachloroethene -_ BTF1398-BLK1 -- -„NO - ug/L 0.50 0.13 ---- <br /> Toluene BTF1398-BLK1 NO ug/L 0.50 0.093 <br /> 1,2,4-Trichlorobenzene - -BTF1398-BLK1 NO - --ug/L_ -0.50 -- 0.17- - <br /> 1,1,1-Trichloroethane BTF1398-BLK1 NO ug/L 0.50 0.081 <br /> 1,1,2-Trichloroethane BTF1398-BLK1 NO ug/L 0.50 0.21 <br /> Trichloroethene BTF1398-BLK1 NO ug/L 0.50 0.13 <br /> Trichlorofluoromethane BTF i 398-BLK i NO uglL 0.50 0,11 <br /> 1,2,3-Tdchloropropane BTF1398-BLK1 NO ug/L 1.0 0.30 <br /> .._.-.-----.._-- <br /> Vinyl chloride BTF1398-BLK1 NO ug/L 0.50 0.14 <br /> Total Xylenes BTF1398-BLK1 NO ug/L 1.0 0.26 <br /> Acetone BTF1398-BLK1 NO ug/L 10 4.6 <br /> Acetonitrile BTF1398-BLK1 NO ug/L --10 6.3 - <br /> Acrolein BTF1398-BLK1 NO ug/L 20 8.9 <br /> Acrylonitrile BTF1398-BLK1 NO ug1L 5.0 1.2 <br /> Allyl chloride BTF139&BLK1 NO ug/L 5.0 0.80 <br /> -----_--_ .... -- _ -- - _. ---- --.._... _ -- <br /> t-Amyl Methyl ether BTF1398-BLK1 NO ug/L 0.50 0.25 -- - - <br /> t-Butyl alcohol--_-- --- - BTF13WBLK1 --NO _- ug/L -- 10 9.4 - ----- <br /> Carbon disulfide - BTF1398-BLK1 NO ug/L 1.0 0.35 <br /> Chloroprene-M- ---- BTF1398-BLK1 - NO ug/L 5.0 --0.37---- -- <br /> trans-1,4-Dichloro-2-butene BTF139&BLK1 NO -ny ug/L 5.0 1_4_ _- <br /> Diisopropyl ether BTF1398-BLK1 - NO -- ug/L 0.50 -0.119 - <br /> Ethanol BTF1398-BLK1 NO ug/L 250 45 <br /> Ethyl methacrylate BTF1398-BLK1 NO ug/L 4.0 0.97 <br /> ...._.._._.._._. <br /> Ethyl t-butyl ether BTF1398-BLK1 NO ug/L 0.50 0.18 <br /> Hexachloroethane BTF1398-BLK1 NO ug/L 0.50 0.13 <br /> 2-Hexanone BTF1398-BLKI NO ug/L 10 3.4 <br /> Isobutanol STF1398-BLK1 NO ug/L 20 5.4 <br /> Methacrylonitrile BTF1398-BLK1 NO ug/L 10 -- 3.1 <br /> Methyl ethyl ketone BTF1398-BLK1 NO ug/L 10 2.5 <br /> Methyl iodide BTF1398-BLK1 NO ug/L 2.0 0.44 <br /> -__._ ...,......------ <br /> Methyl isobutyl ketone BTF1398-BLK1 NO ug/L 10 2.1 <br /> Methyl methacrylate BTF1398-BLK1 NO ug/L 5.0 1.5 <br /> The results in this report apply to the samples analyzed in accordance with the chain of custody document.This analytical report must be reproduced to 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 <br /> 4100 Atias Court Bakersfield,CA 93308 (661)327-4911 FAX(661)327-1918 www.bclabs.com Page 32 of 36 <br />