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® ® � I� � ® � ® li• ® ® ® Ili <br /> Herst Associates Project: Misc.Samples Reported: 05123/2007 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 /> Benzene BQE0698 Matrix Spike 0703711-71 ND 0.13108 0.12500 mg/kg 105 70-130 <br /> Matrix Spike Duplicate 0703711-71 ND 0.13036 0.12500 mg/kg 1.0 104 20 70-130 <br /> Bromodichloromethane BQE0698 Matrix Spike 0703711-71 ND 0.10232 0.12500 mg/kg 81.9 70-130 <br /> Matrix Spike Duplicate 0703711-71 ND 0.10358 0.12500 mg/kg 1.2 82.9 20 70-130 <br /> Chlorobenzene BQE0698 Matrix Spike 0703711-71 ND 0.10901 0.12500 mg/kg 87.2 70-130 <br /> Matrix Spike Duplicate 0703711-71 ND 0.10872 0.12500 mg/kg 0.2 87.0 20 70-130 <br /> Chloroethane BQE0698 Matrix Spike 0703711-71 ND 0.12485 0.12500 mg/kg 99.9 70-130 <br /> Matrix Spike Duplicate 0703711-71 ND 0.12207 0.12500 mg/kg 2.2 97.7 20 70-130 <br /> 1,4-Dichlorobenzene BQE0698 Matrix Spike 0703711-71 ND 0.11494 0.12500 mg/kg 92.0 70-130 <br /> Matrix Spike Duplicate 0703711-71 ND 0.11132 0.12500 mg/kg 3.2 89.1 20 70-130 <br /> 1,1-Dichloroethane BQE0698 Matrix Spike 0703711-71 ND 0.11704 0.12500 mg/kg 93.6 70-130 <br /> Matrix Spike Duplicate 0703711-71 ND 0.11705 0.12500 mg/kg 0 93.6 20 70-130 <br /> 1,1-Dichloroethene BQE0698 Matrix Spike 0703711-71 ND 0.11563 0.12500 mg/kg 92.5 70-130 <br /> Matrix Spike Duplicate 0703711-71 ND 0.11545 0.12500 mg/kg 0.1 92.4 20 70-130 <br /> Toluene BQE0698 Matrix Spike 0703711-71 ND 0.12036 0.12500 mg/kg 96.3 70-130 <br /> Matrix Spike Duplicate 0703711-71 ND 0.11894 0.12500 mg/kg 1.1 95.2 20 70-130 <br /> Trichloroethene BQE0698 Matrix Spike 0703711-71 ND 0.11866 0.12500 mg/kg 94.9 70-130 <br /> Matrix Spike Duplicate 0703711-71 ND 0.11889 0.12500 mg/kg 0.2 95.1 20 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) BQE0698 Matrix Spike 0703711-71 ND 0.046330 0.050000 mg/kg 92.7 70-121 <br /> Matrix Spike Duplicate 0703711-71 ND 0.046730 0.050000 mg/kg 93.5 70-121 <br /> Toluene-d8(Surrogate) BQE0698 Matrix Spike 0703711-71 ND 0.052010 0.050000 mg/kg 104 81-117 <br /> Matrix Spike Duplicate 0703711-71 ND 0.051150 0.050000 mg/kg 102 81-117 <br /> 4-Bromofluorobenzene(Surrogate) BQE0698 Matrix Spike 0703711-71 ND 0.049280 0.050000 mg/kg 98.6 74-121 <br /> Matrix Spike Duplicate 0703711-71 ND 0.056480 0.050000 mg/kg 113 74-121 <br /> Benzene BQE1046 Matrix Spike 0705705-01 ND 26.240 25.000 ug/L 105 70-130 <br /> Matrix Spike Duplicate 0705705-01 ND 26.750 25.000 ug/L 1.9 107 20 70-130 <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 27 of 37 <br />