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Laboratories "nC., <br />Environmental Testing Laboratory Since 1949 <br />Herst Associates Reported: 07/21/2010 16:44 <br />4630 South Highway 94 North Outer Road Project: NCYC <br />Saint Charles, MO 63304 Project Number: [none] <br />Project Manager: Erin Fanning <br />1 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 Type Result Level Units Recovery RPD Recovery RPD Lab Quals <br />QC Batch ID: BTG 1160 <br />Benzene <br />BTG1160-BS1 <br />LCS <br />23.840 <br />25.000 <br />ug/L <br />95.4 <br />70-130 <br />Bromodichloromethane <br />BTG1160-BS1 <br />LCS <br />21.930 <br />25.000 <br />ug/L <br />87.7 <br />70-130 <br />Chlorobenzene <br />BTG1160-BS1 <br />LCS <br />22.290 <br />25.000 <br />ug/L <br />89.2 <br />70-130 <br />Chloroethane <br />BTG1160-BSl <br />LCS <br />23.910 <br />25.000 <br />ug/L <br />95.6 <br />70-130 <br />1,4 -Dichlorobenzene <br />BTG1160-BSl <br />LCS <br />23.470 <br />25.000 <br />ug/L <br />93.9 <br />70-130 <br />1,1-Dichioroethane <br />BTG1160-BSI <br />LCS <br />23.500 <br />25.000 <br />ug/L <br />94.0 <br />70-130 <br />1,1-Dichloroethene <br />BTG1160-BS1 <br />LCS <br />26.090 <br />25.000 <br />ug/L <br />104 <br />70-130 <br />Toluene <br />BTG1160-BS1 <br />LCS <br />22.960 <br />25.000 <br />ug/L <br />91.8 <br />70-130 <br />Trichloroethene — <br />BTG1160-BSI <br />LCS <br />23.700 <br />25.000 <br />ug/L <br />94.8 <br />70-130 <br />1,2-Dichloroethane-d4 (Surrogate) <br />BTG1160-BSI <br />LCS <br />9.6800 <br />10.000 <br />ug/L <br />96.8 <br />76-114 <br />Toluene -d8 (Surrogate) <br />BTG1160-BS1 <br />LCS <br />10.030 <br />10.000 <br />ug/L <br />100 <br />88-110 <br />4-Bromofluorobenzene (Surrogate) <br />BTG1160-BS1 <br />LCS <br />10.600 <br />10.000 <br />ug/L <br />106 <br />86-115 <br />The results in this report apply to the samples analyzed <br />in accordance with the <br />chain of custody document. This analytical <br />report must he reproduced in its entirety. <br />All results listed in this report are <br />for the exclusive use of the submitting party-. BC Laboratories, <br />4100 Atlas Court Bakersfield, CA 93308 (661) <br />Inc. assumes no responsibility <br />327-4911 FAX <br />for report alteration, <br />(661) 327-1918 <br />separation, detachment <br />www.bclabs.com <br />or third party interpretation. <br />' <br />Page 27 of 29 <br />