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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 Method 8260) <br /> Quality Control Report - Precision & Accuracy <br /> Control Limits <br /> Source Source Spike Percent Percent <br /> Constituent Batch ID QC Sample Type Sample ID Result Result Added Units RPD Recovery RPD Recovery Lab Quals <br /> Benzene BQE1080 Matrix Spike 0705833-08 0 27.200 25.000 ug/L 109 70-130 <br /> Matrix Spike Duplicate 0705833-08 0 27.560 25.000 ug/L 0.9 110 20 70-130 <br /> Bromodichloromethane BQE1080 Matrix Spike 0705833-08 0 26.300 25.000 ug/L 105 70-130 <br /> Matrix Spike Duplicate 0705833-08 0 26.200 25.000 ug/L 0 105 20 70-130 <br /> Chlorobenzene BQE1080 Matrix Spike 0705833-08 0 26.720 25.000 ug/L 107 70-130 <br /> Matrix Spike Duplicate 0705833-08 0 26.410 25.000 ug/L 0.9 106 20 70-130 <br /> Chloroethane BQE1080 Matrix Spike 0705833-08 0 29.690 25.000 ug/L 119 70-130 <br /> Matrix Spike Duplicate 0705833-08 0 29.540 25.000 ug/L 0.8 118 20 70-130 <br /> 1,4-Dichlorobenzene BQE1080 Matrix Spike 0705833-08 0 24.140 25.000 ug/L 96.6 70-130 <br /> Matrix Spike Duplicate 0705833-08 0 24.080 25.000 ug/L 0.3 96.3 20 70-130 <br /> 1,1-Dichloroethane BQE1080 Matrix Spike 0705833-08 0 28.640 25.000 ug/L 115 70-130 <br /> Matrix Spike Duplicate 0705833-08 0 28.180 25.000 ug/L 1.8 113 20 70-130 <br /> 1,1-Dichloroethene BQE1080 Matrix Spike 0705833-08 0 26.460 25.000 ug/L 106 70-130 <br /> Matrix Spike Duplicate 0705833-08 0 26.770 25.000 ug/L 0.9 107 20 70-130 <br /> Toluene BQE1080 Matrix Spike 0705833-08 0 27.990 25.000 ug/L 112 70-130 <br /> Matrix Spike Duplicate 0705833-08 0 27.900 25.000 ug/L 0 112 20 70-130 <br /> Trichloroethene BQE1080 Matrix Spike 0705833-08 0 26.130 25.000 ug/L 105 70-130 <br /> Matrix Spike Duplicate 0705833-08 0 26.120 25.000 ug/L 1.0 104 20 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) BQE1080 Matrix Spike 0705833-08 ND 10.740 10.000 ug/L 107 76-114 <br /> Matrix Spike Duplicate 0705833-08 ND 10.520 10.000 ug/L 105 76-114 <br /> Toluene-d8(Surrogate) BQE1080 Matrix Spike 0705833-08 ND 10.000 10.000 ug/L 100 88-110 <br /> Matrix Spike Duplicate 0705833-08 ND 10.110 10.000 ug/L 101 88-110 <br /> 4-Bromofluorobenzene(Surrogate) BQE1080 Matrix Spike 0705833-08 ND 10.570 10.000 ug/L 106 86-115 <br /> Matrix Spike Duplicate 0705833-08 ND 10.260 10.000 ug/L 103 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 37 of 42 <br />