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® - = M M = M ® = M M ® = i = i <br /> 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 - 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 /> Bromodichloromethane BQE1046 Matrix Spike 0705705-01 ND 25.620 25.000 ug/L 102 70-130 <br /> Matrix Spike Duplicate 0705705-01 ND 25.700 25.000 ug/L 1.0 103 20 70-130 <br /> Chlorobenzene BQE1046 Matrix Spike 0705705-01 ND 26.450 25.000 ug/L 106 70-130 <br /> Matrix Spike Duplicate 0705705-01 ND 27.060 25.000 ug/L 1.9 108 20 70-130 <br /> Chloroethane BQE1046 Matrix Spike 0705705-01 ND 28.080 25.000 ug/L 112 70-130 <br /> Matrix Spike Duplicate 0705705-01 ND 27.930 25.000 ug/L 0 112 20 70-130 <br /> 1,4-Dichlorobenzene BQE1046 Matrix Spike 0705705-01 ND 25.160 25.000 ug/L 101 70-130 <br /> Matrix Spike Duplicate 0705705-01 ND 24.230 25.000 ug/L 4.1 96.9 20 70-130 <br /> 1,1-Dichloroethane BQE1046 Matrix Spike 0705705-01 ND 28.080 25.000 ug/L 112 70-130 <br /> Matrix Spike Duplicate 0705705-01 ND 28.420 25.000 ug/L 1.8 114 20 70-130 <br /> 1,1-Dichloroethene BQE1046 Matrix Spike 0705705-01 ND 25.910 25.000 ug/L 104 70-130 <br /> Matrix Spike Duplicate 0705705-01 ND 26.170 25.000 ug/L 1.0 105 20 70-130 <br /> Toluene BQE1046 Matrix Spike 0705705-01 ND 27.210 25.000 ug/L 109 70-130 <br /> Matrix Spike Duplicate 0705705-01 ND 27.110 25.000 ug/L 0.9 108 20 70-130 <br /> Trichloroethene BQE1046 Matrix Spike 0705705-01 ND 24.710 25.000 ug/L 98.8 70-130 <br /> Matrix Spike Duplicate 0705705-01 ND 24.960 25.000 ug/L 1.0 99.8 20 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) BQE1046 Matrix Spike 0705705-01 ND 10.900 10.000 ug/L 109 76-114 <br /> Matrix Spike Duplicate 0705705-01 ND 10.270 10.000 ug/L 103 76-114 <br /> Toluene-d8(Surrogate) BQE1046 Matrix Spike 0705705-01 ND 10.260 10.000 ug/L 103 88-110 <br /> Matrix Spike Duplicate 0705705-01 ND 10.220 10.000 ug/L 102 88-110 <br /> 4-Bromofluorobenzene(Surrogate) BQE1046 Matrix Spike 0705705-01 ND 10.790 10.000 ug/L 108 86-115 <br /> Matrix Spike Duplicate 0705705-01 ND 10.300 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 28 of 37 <br />