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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 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 BQE0962 Matrix Spike 0705463-02 NO 24.730 25.000 ug/L 98.9 70-130 <br /> Matrix Spike Duplicate 0705463-02 NO 24.980 25.000 ug/L 1.0 99.9 20 70-130 <br /> Bromodichloromethane BQE0962 Matrix Spike 0705463-02 NO 25.470 25.000 ug/L 102 70-130 <br /> Matrix Spike Duplicate 0705463-02 NO 24.560 25.000 ug/L 3.8 98.2 20 70-130 <br /> Chlorobenzene BQE0962 Matrix Spike 0705463-02 ND 26.410 25.000 ug/L 106 70-130 <br /> Matrix Spike Duplicate 0705463-02 ND 25.760 25.000 ug/L 2.9 103 20 70-130 <br /> Chloroethane BQE0962 Matrix Spike 0705463-02 NO 27.420 25.000 ug/L 110 70-130 <br /> Matrix Spike Duplicate 0705463-02 NO 27.320 25.000 ug/L 0.9 109 20 70-130 <br /> 1,4-Dichlorobenzene BQE0962 Matrix Spike 0705463-02 ND 25.450 25.000 ug/L 102 70-130 <br /> Matrix Spike Duplicate 0705463-02 ND 25.350 25.000 ug/L 1.0 101 20 70-130 <br /> 1,1-Dichlomethane BQE0962 Matrix Spike 0705463-02 NO 25.570 25.000 ug/L 102 70-130 <br /> Matrix Spike Duplicate 0705463-02 NO 25.530 25.000 ug/L 0 102 20 70-130 <br /> 1,1-Dichloroethene BQE0962 Matrix Spike 0705463-02 ND 26.670 25.000 ug/L 107 70-130 <br /> Matrix Spike Duplicate 0705463-02 NO 26.350 25.000 ug/L 1.9 105 20 70-130 <br /> Toluene BQE0962 Matrix Spike 0705463-02 ND 25.460 25.000 ug/L 102 70-130 <br /> Matrix Spike Duplicate 0705463-02 NO 25.010 25.000 ug/L 2.0 100 20 70-130 <br /> Trichloroethene BOE0962 Matrix Spike 0705463-02 NO 24.820 25.000 ug/L 99.3 70-130 <br /> Matrix Spike Duplicate 0705463-02 NO 24.520 25.000 ug/L 1.2 98.1 20 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) BOE0962 Matrix Spike 0705463-02 NO 9.8100 10.000 ug/L 98.1 76-114 <br /> Matrix Spike Duplicate 0705463-02 NO 9.8400 10.000 ug/L 98.4 76-114 <br /> Toluene-d8(Surrogate) BQE0962 Matrix Spike 0705463-02 NO 9.7300 10.000 ug/L 97.3 88-110 <br /> Matrix Spike Duplicate 0705463-02 NO 9.7900 10.000 ug/L 97.9 88-110 <br /> 4-Bromofluorobenzene(Surrogate) BQE0962 Matrix Spike 0705463-02 NO 9.8700 10.000 ug/L 98.7 86-115 <br /> Matrix Spike Duplicate 0705463-02 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-tody document.This analytical report must be reproduced in its entirety. <br /> Pege 21 of 24 <br />