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LABORATORIES, INC. <br /> Herst Associates Project: Misc. Samples Reported: 08/06/2007 11:10 <br /> 4630 South Highway 94 North Outer Road Project Number: NCYC <br /> North Outer Rd. Project Manager: David Vasbinder <br /> Saint Charles, MO 63304 <br /> Volatile Organic Analysis (EPA Method 8260) <br /> Quality Control Report - Precision & Accuracy <br /> Control Limits <br /> Source Source Spike Percent Percent <br /> Constituent Batch ID QC Sample Ty2e Sample ID Result Result Added Units RPD Recovery RPD Recovery Lab Quals <br /> Benzene BQH0144 Matrix Spike 0708790-05 ND 24.330 25.000 ug/L 97.3 70-130 <br /> Matrix Spike Duplicate 0708790-05 ND 24.330 25.000 ug/L 0 97.3 20 70-130 <br /> Bromodichloromethane BQH0144 Matrix Spike 0708790-05 ND 26.620 25.000 ug/L 106 70-130 <br /> Matrix Spike Duplicate 0708790-05 ND 25.890 25.000 ug/L 1.9 104 20 70-130 <br /> Chlorobenzene BQH0144 Matrix Spike 0708790-05 ND 26.870 25.000 ug/L 107 70-130 <br /> Matrix Spike Duplicate 0708790-05 ND 27.260 25.000 ug/L 1.9 109 20 70-130 <br /> Chloroethane BQH0144 Matrix Spike 0708790-05 ND 23.420 25.000 ug/L 93.7 70-130 <br /> Matrix Spike Duplicate 0708790-05 ND 24.200 25.000 ug/L 3.3 96.8 20 70-130 <br /> 1,4-Dichlorobenzene BQH0144 Matrix Spike 0708790-05 ND 27.170 25.000 ug/L 109 70-130 <br /> Matrix Spike Duplicate 0708790-05 ND 27.430 25.000 ug/L 0.9 110 20 70-130 <br /> 1,1-Dichloroethane BQH0144 Matrix Spike 0708790-05 ND 24.900 25.000 ug/L 99.6 70-130 <br /> Matrix Spike Duplicate 0708790-05 ND 24.920 25.000 ug/L 0.1 99.7 20 70-130 <br /> 1,1-Dichloroethene BQH0144 Matrix Spike 0708790-05 ND 26.380 25.000 ug/L 106 70-130 <br /> Matrix Spike Duplicate 0708790-05 ND 26.090 25.000 ug/L 1.9 104 20 70-130 <br /> Toluene BQH0144 Matrix Spike 0708790-05 ND 26.010 25.000 ug/L 104 70-130 <br /> Matrix Spike Duplicate 0708790-05 ND 25.430 25.000 ug/L 1.9 102 20 70-130 <br /> Trichloroethene BQH0144 Matrix Spike 0708790-05 ND 27.380 25.000 ug/L 110 70-130 <br /> Matrix Spike Duplicate 0708790-05 ND 26.920 25.000 ug/L 1.8 108 20 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) BQH0144 Matrix Spike 0708790-05 ND 9.5200 10.000 ug/L 95.2 76-114 <br /> Matrix Spike Duplicate 0708790-05 ND 9.1300 10.000 ug/L 91.3 76-114 <br /> Toluene-d8(Surrogate) BQH0144 Matrix Spike 0708790-05 ND 9.7200 10.000 ug/L 97.2 88-110 <br /> Matrix Spike Duplicate 0708790-05 ND 9.6100 10.000 ug/L 96.1 88-110 <br /> 4-Bromofluorobenzene(Surrogate) BQH0144 Matrix Spike 0708790-05 ND 9.9700 10.000 ug/L 99.7 86-115 <br /> Matrix Spike Duplicate 0708790-05 ND 9.9200 10.000 ug/L 99.2 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. <br /> ® M ® X00 t�our�cers�A 9=•(6 7-49�AX�327�•wvlWabs.= ® Page 27 of® <br />