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LABORATORIES, INC. <br /> Herst Associates Project: NCYC Reported: 02/01/2008 12:10 <br /> 4630 South Highway 94 North Outer Road Project Number: [none] <br /> Saint Charles, MO 63304 Project Manager: David Vasbinder <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 Recoveg RPD Recovery Lab Quals <br /> Bromodichloromethane BRA1087 Matrix Spike 0800932-06 0 27.200 25.000 ug/L 109 70- 130 <br /> Matrix Spike Duplicate 0800932-06 0 27.150 25.000 ug/L 0 109 20 70-130 <br /> Chlorobenzene BRA1087 Matrix Spike 0800932-06 0 26.360 25.000 ug/L 105 70-130 <br /> Matrix Spike Duplicate 0800932-06 0 26.240 25.000 ug/L 0 105 20 70- 130 <br /> Chloroethane BRA1087 Matrix Spike 0800932-06 0 31.760 25.000 ug/L 127 70- 130 <br /> Matrix Spike Duplicate 0800932-06 0 31.610 25.000 ug/L 0.8 126 20 70-130 <br /> 1,4-Dichlorobenzene BRA1087 Matrix Spike 0800932-06 0 23.390 25.000 ug/L 93.6 70- 130 <br /> Matrix Spike Duplicate 0800932-06 0 23.060 25.000 ug/L 1.5 92.2 20 70-130 <br /> 1,1-Dichloroethane BRA1087 Matrix Spike 0800932-06 0 28.710 25.000 ug/L 115 70- 130 <br /> Matrix Spike Duplicate 0800932-06 0 28.680 25.000 ug/L 0 115 20 70-130 <br /> 1,1-Dichloroethene BRA1087 Matrix Spike 0800932-06 0 29.810 25.000 ug/L 119 70- 130 <br /> Matrix Spike Duplicate 0800932-06 0 29.840 25.000 ug/L 0 119 20 70-130 <br /> Toluene BRA1087 Matrix Spike 0800932-06 0 27.020 25.000 ug/L 108 70-130 <br /> Matrix Spike Duplicate 0800932-06 0 26.630 25.000 ug/L 0.9 107 20 70-130 <br /> Trichloroethene BRA1087 Matrix Spike 0800932-06 0 26.540 25.000 ug/L 106 70-130 <br /> Matrix Spike Duplicate 0800932-06 0 26.270 25.000 ug/L 0.9 105 20 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) BRA1087 Matrix Spike 0800932-06 ND 11.210 10.000 ug/L 112 76- 114 <br /> Matrix Spike Duplicate 0800932-06 ND 11.350 10.000 ug/L 114 76-114 <br /> Toluene-d8(Surrogate) BRA1087 Matrix Spike 0800932-06 ND 10.290 10.000 ug/L 103 88- 110 <br /> Matrix Spike Duplicate 0800932-06 ND 10.270 10.000 ug/L 103 88-110 <br /> 4-Bromofluorobenzene(Surrogate) BRA1087 Matrix Spike 0800932-06 ND 9.6800 10.000 ug/L 96.8 86-115 <br /> Matrix Spike Duplicate 0800932-06 ND 9.8400 10.000 ug/L 98.4 86-115 <br /> Benzene BRA1769 Matrix Spike 0801357-01 0 23.042 25.000 ug/L 92.2 70-130 <br /> Matrix Spike Duplicate 0801357-01 0 23.972 25.000 ug/L 3.9 95.9 20 70-130 <br /> Bromodichloromethane BRA1769 Matrix Spike 0801357-01 0 24.602 25.000 ug/L 98.4 70-130 <br /> Matrix Spike Duplicate 0801357-01 0 24.380 25.000 ug/L 0.9 97.5 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 /> 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. Page 31 of 43 <br /> 4100 Atlas Court-Bakersfield,CA 93308 -(661)327-491.1 -FAX(661)327-1918 -www.bclabs.com <br />