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LABORATORIES, INC. <br /> Herst Associates Project: Misc. Samples Reported: 08/28/2007 11:45 <br /> 4630 South Highway 94 North Outer Road Project Number: NCYC <br /> Saint Charles, MO 63304 Project Manager: David Vasbinder <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 Recove RPD Lab Quals <br /> Benzene BQH1594 BQH1594-BS1 LCS 25.570 25.000 0.50 ug/L 102 70-130 <br /> Bromodichloromethane BQH1594 BQH1594-BS1 LCS 27.740 25.000 0.50 ug/L 111 70-130 <br /> Chlorobenzene BOH1594 BQH1594-BS1 LCS 24.870 25.000 0.50 ug/L 99.5 70-130 <br /> Chloroethane BQH1594 BQH1594-BS1 LCS 24.220 25.000 0.50 ug/L 96.9 70-130 <br /> 1,4-Dichlorobenzene BQH1594 BQH1594-BSI LCS 24.410 25.000 0.50 ug/L 97.6 70-130 <br /> 1,1-Dichloroethane BQH1594 BQH1594-BS1 LCS 26.240 25.000 0.50 ug/L 105 70-130 <br /> 1,1-Dichloroethene BQH1594 BQH1594-BSI LCS 27.350 25.000 0.50 ug/L 109 70-130 <br /> Toluene BQH1594 BQH1594-BS1 LCS 26.070 25.000 0.50 ug/L 104 70-130 <br /> Trichloroethene BQH1594 BQH1594-BSI LCS 26.490 25.000 0.50 ug/L 106 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) BQH1594 BQH1594-BS1 LCS 10.530 10.000 ug/L 105 76-114 <br /> Toluene-d8(Surrogate) BQH1594 BQH1594-BS1 LCS 9.9800 10.000 ug/L 99.8 88-110 <br /> 4-Bromofluorobenzene(Surrogate) BQH1594 BQH1594-BS1 LCS 9.8200 10.000 ug/L 98.2 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 /> All results listed in this report are for the exclusive use of the submitting party.BC Laboratories,Inc.assumes no responsibility for report alteration,separation, detachment or third party interpretation. page 28 of 32 <br /> a� ® ® M00 4WourIlllllllllIkersWWA 9=•(6qM7-49lllllIlIllI[AX M3274ft•wvMabs.® <br />