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® = = ® = = = = = = = M ® ® ® ® = s <br /> Herst Associates Project: Misc.Samples Reported: 05/23/2007 13:31 <br /> 4630 South Highway 94 North Outer Road Project Number: [none] <br /> North Outer Rd. Project Manager: David Vasbinder <br /> Saint Charles,MO 63304 <br /> Volatile Organic Analysis (EPA Method 8260) <br /> Quality Control Report - Laboratory Control Sample <br /> Control Limits <br /> Spike Percent Percent <br /> Constituent Batch ID QC Sample ID QC Type Result Level PQL Units Recovery RPD Recovery RPD Lab Quals <br /> Benzene BQE1080 BQE1080-BS1 LCS 27.970 25.000 0.50 ug/L 112 70-130 <br /> Bromodichloromethane BQE1080 BQE1080-BS1 LCS 26.940 25.000 0.50 ug/L 108 70-130 <br /> Chlorobenzene BQE1080 BQE1080-BS1 LCS 26.940 25.000 0.50 ug/L 108 70-130 <br /> Chloroethane BQE1080 BQE1080-BS1 LCS 29.670 25.000 0.50 ug/L 119 70-130 <br /> 1,4-Dichlorobenzene BQE1080 BQE1080-BSI LCS 23.100 25.000 0.50 ug/L 92.4 70-130 <br /> 1,1-Dichloroethane BQE1080 BQE1080-BS1 LCS 29.110 25.000 0.50 ug/L 116 70-130 <br /> 1,1-Dichloroethene BQE1080 BQE1080-BS1 LCS 27.440 25.000 0.50 ug/L 110 70-130 <br /> Toluene BQE1080 BQE1080-BS1 LCS 28.900 25.000 0.50 ug/L 116 70-130 <br /> Trichloroethene BQE1080 BQE1080-BSI LCS 27.960 25.000 0.50 ug/L 112 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) BQE1080 BQE1080-BS1 LCS 10.720 10.000 ug/L 107 76-114 <br /> Toluene-d8(Surrogate) BQE1080 BQE1080-BS1 LCS 10.010 10.000 ug/L 100 88-110 <br /> 4-Bromofluorobenzene(Surrogate) BQE1080 BQE1080-BS1 LCS 9.9700 10.000 ug/L 99.7 86-115 <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 /> Page 38 of 42 <br />