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Laboratories Inc. <br /> Environmental Testing La!orato;r!yS1ncwe 1949 <br /> Herst Associates Reported: 06/23/2010 12:34 <br /> 4630 South Highway 94 North Outer Road Project: Austin Road/NCYCC Drilling <br /> Saint.-Charles.,-MO-63304I ..........Project Number: fnonel <br /> ...............-.-....... ------ <br /> Project Manager: Erin Fanning <br /> Volatile Organic Analysis (EPA Method 8260) <br /> Quality Control Report - Laboratory Control Sample <br /> Control Limits <br /> Spike Percent Percent <br /> Constituent QC Sample ID lype Result Level _ Units Recove!y RPD RecoveEy RPD Lab Quals <br /> QC-Batch ID: BTF1398 <br /> Benzene BTF1398-BS1 LCS 24.880 25.000 ug/L 99.5 70- 130 <br /> Bromodichloromellane BTF13911-BS1 LCS 25,970 25,010 ug/L 114 70-110 <br /> Chlorobenzene BTF1398-BSI LCS 22.330 25.000 ug/L 89.3 70-130 <br /> Chloroethane BTF1 398-BS1 LCS 24.470 25-000 ug/L 97.9 70-130 <br /> 1,4-Dichlorobenzene BTF1398-BS1 LCS 22.800 25.000 ug/L 91.2 70-130 <br /> 1,1-01chloroethane BTF1398-BSI LCS 25.260 25.000 ug/L 101 70-130 ...... <br /> 1,1-Dichloroethene BTF1398-BSI LCS 27,440 25.000 ug/L 110 70-130 <br /> Toluene BTF1398-BS1 LCS 24,280 25.000 ug/L 97.1 70-130 <br /> Trichloroethene BTF1398-BS1 LCS 24.650 25.000 ug/L 98.6 70-130---- <br /> 1,2-Dichloroethane-d4(Surrogate) BTF1398-BS1 LCS 10.000 10.000 ug/L 100 76-114 <br /> Toluene-C18(Surrogate) BTF1398-BSI LCS 10.010 10.000 ug/L 100 88-110 <br /> 4-Bro mofluorobenzene(Surrogate) BTF1398-BSI LCS 9.6400 10.000 ug/L 96.4 86-1-15 <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 in its entirety. <br /> All results listed in this report are for the exclusive use of the submitting patty BC Laboratories,Inc.assumes no responsibility for report alteratiorl separation,detachment or third parry interpretation <br /> 4100 Atlas Court Bakersfield,CA 93308 (661)3274911 FAX(661)327-1918 www,belabs.com Page 34 of 36 <br />