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M ® M M w ® M M ® ® Ml M M M <br /> Herst Associates Project: Misc.Samples Reported: 05/23/2007 13:27 <br /> 4630 South Highway 94 North Outer Road Project Number: NCYC Well Sample <br /> North Outer Rd. Project Manager: David Vasbinder <br /> Saint Charles,MO 63304 <br /> Volatile Organic Analysis (EPA Method 260) <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 BQE0962 BQE0962-BSI LCS 27.810 25.000 0.50 ug/L 111 70-130 <br /> Bromodichlommethane BQE0962 BQE0962-BSI LCS 28.050 25.000 0.50 ug/L 112 70-130 <br /> Chlorobenzene BQE0962 BQE0962-BSI LCS 29.820 25.000 0.50 ug/L 119 70-130 <br /> Chloroethane BQE0962 BQE0962-BSI LCS 29.980 25.000 0.50 ug/L 120 70-130 <br /> 1,4-Dichlorobenzene BQE0962 BQE0962-BS1 LCS 28.720 25.000 0.50 ug/L 115 70-130 <br /> 1,1-Dichloroethane BQE0962 BQE0962-BSI LCS 28.340 25.000 0.50 ug/L 113 70-130 <br /> 1,1-Dichlormthene BQE0962 BQE0962-BSI LCS 29.770 25.000 0.50 ug/L 119 70-130 <br /> Toluene BQE0962 BQE0962-BSI LCS 28.420 25.000 0.50 u91L 114 70-130 <br /> Trichloroethene BQE0962 BQE0962-BS1 LCS 28.070 25.000 0.50 ug/L 112 70-130 <br /> 1,2-Dichloroethane-d4(surrogate) BQE0962 BQE0962-BS1 LCS 9.5800 10.000 ug/L 95.8 76-114 <br /> Toluene-d8(Surrogate) BQE0962 BQE0962-BSI LCS 9.8700 10.000 ug/L 98.7 88-110 <br /> 4-Bromofluombenzene(Surrogate) BQE0962 BQE0962-BS1 LCS 10.110 10.000 ug/L 101 86-115 <br /> BC Laboratories The reeulfs in this report apply to the samples analyzed in accordance with the chain of—Iody document.This analytical report must be reproduced in its entirely. <br /> Page 22 of 24 <br />