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Herst Associates Project: Misc.Samples Reported! 05/23/2007 13:28 <br /> 4630 South Highway 94 North Outer Road Project Number: NCYC Tank Samples <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 BQE0698 BQE0698-BS1 LCS 0.12443 0.12500 0.0050 mg/kg 99.5 70-130 <br /> Bromodichloromethane BQE0698 BQE0698-BSI LCS 0.10493 0.12500 0.0050 mg/kg 83.9 70-130 <br /> Chlorobenzene BQE0698 BQE0698-BS1 LCS 0.11099 0.12500 0.0050 mg/kg 88.8 70-130 <br /> Chloroethane BQE0698 BQE0698-BS1 LCS 0.11977 0.12500 0.0050 mg/kg 95.8 70-130 <br /> 1,4-Dichlorobenzene BQE0698 BQE0698-BS1 LCS 0.10981 0.12500 0.0050 mg/kg 87.8 70-130 <br /> 1,1-Dichloroethane BQE0698 BQE0698-BS1 LCS 0.11534 0.12500 0.0050 mg/kg 92.3 70-130 <br /> 1,1-Dichloroethene BQE0698 BQE0698-BS1 LCS 0.12313 0.12500 0.0050 mg/kg 98.5 70-130 <br /> Toluene BQE0698 BQE0698-BS1 LCS 0.12027 0.12500 0.0050 mg/kg 96.2 70-130 <br /> Trichloroethene BQE0698 BQE0698-BS1 LCS 0.12209 0.12500 0.0050 mg/kg 97.7 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) BQE0698 BQE0698-BS1 LCS 0.044480 0.050000 mg/kg 89.0 70-121 <br /> Toluene-d8(Surrogate) BQE0698 BQE0698-BS1 LCS 0.052570 0.050000 mg/kg 105 81-117 <br /> 4-Bromofluorobenzene(Surrogate) BQE0698 BQE0698-BS1 LCS 0.055540 0.050000 mg/kg 111 74-121 <br /> Benzene BQE1046 BQE1046-BS1 LCS 26.200 25.000 0.50 ug/L 105 70-130 <br /> Bromodichloromethane BQE1046 BQE1046-BS1 LCS 24.390 25.000 0.50 ug/L 97.6 70-130 <br /> Chlorobenzene BQE1046 BQE1046-BSI LCS 26.530 25.000 0.50 ug/L 106 70-130 <br /> Chloroethane BQE1046 BQE1046-BSI LCS 27.010 25.000 0.50 ug/L 108 70-130 <br /> 1,4-Dichlorobenzene BQE1046 BQE1046-BSI LCS 23.920 25.000 0.50 ug/L 95.7 70-130 <br /> 1,1-Dichloroethane BQE1046 BQE1046-BSI LCS 27.700 25.000 0.50 ug/L 111 70-130 <br /> 1,1-Dichloroethene BQE1046 BQE1046-BSI LCS 25.500 25.000 0.50 ug/L 102 70-130 <br /> Toluene BQE1046 BQE1046-BS1 LCS 26.310 25.000 0.50 ug/L 105 70-130 <br /> Trichloroethene BQE1046 BQE1046-BS1 LCS 24.310 25.000 0.50 ug/L 97.2 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) BQE1046 BQE1046-BS1 LCS 10.230 10.000 ug/L 102 76-114 <br /> Toluene-d8(Surrogate) BQE1046 BQE1046-BS1 LCS 10.000 10.000 ug/L 100 88-110 <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 29 of 37 <br />