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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 Repo - 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 /> Chlorobenzene BRA1769 Matrix Spike 0801357-01 0 25.426 25.000 ug/L 102 70- 130 <br /> Matrix Spike Duplicate 0801357-01 0 24.563 25.000 ug/L 3.7 98.3 20 70- 130 <br /> Chloroethane BRA1769 Matrix Spike 0801357-01 0 23.526 25.000 ug/L 94.1 70- 130 <br /> Matrix Spike Duplicate 0801357-01 0 23.942 25.000 ug/L 1.8 95.8 20 70-130 <br /> 1,4-Dichlorobenzene BRA1769 Matrix Spike 0801357-01 0 25.425 25.000 ug/L 102 70-130 <br /> Matrix Spike Duplicate 0801357-01 0 25.479 25.000 ug/L 0 102 20 70- 130 <br /> 1,1-Dichloroethane BRA1769 Matrix Spike 0801357-01 0 24.168 25.000 ug/L 96.7 70- 130 <br /> Matrix Spike Duplicate 0801357-01 0 24.068 25.000 ug/L 0.4 96.3 20 70- 130 <br /> 1,1-Dichloroethene BRA1769 Matrix Spike 0801357-01 0 24.598 25.000 ug/L 98.4 70- 130 <br /> Matrix Spike Duplicate 0801357-01 0 25.072 25.000 ug/L 1.6 100 20 70- 130 <br /> Toluene BRA1769 Matrix Spike 0801357-01 0 25.869 25.000 ug/L 103 70- 130 <br /> Matrix Spike Duplicate 0801357-01 0 24.897 25.000 ug/L 3.4 99.6 20 76- 130 <br /> Trichloroethene BRA1769 Matrix Spike 0801357-01 0 25.230 25.000 ug/L 101 70- 130 <br /> Matrix Spike Duplicate 0801357-01 0 24.181 25.000 ug/L 4.4 96.7 20 70- 130 <br /> 1,2-Dichloroethane-d4(Surrogate) BRA1769 Matrix Spike 0801357-01 ND 9.2086 10.000 ug/L 92.1 76- 114 <br /> Matrix Spike Duplicate 0801357-01 ND 9.7780 10.000 ug/L 97.8 76- 114 <br /> Toluene-d8(Surrogate) BRA1769 Matrix Spike 0801357-01 ND 10.222 10.000 ug/L 102 88- 110 <br /> Matrix Spike Duplicate 0801357-01 ND 9.6758 10.000 ug/L 96.8 88- 110 <br /> 4-Bromofluorobenzene(Surrogate) BRA1769 Matrix Spike 0801357-01 ND 10.320 10.000 ug/L 103 86- 115 <br /> Matrix Spike Duplicate 0801357-01 ND 9.9223 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 custody document. This analytical report nnust he 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 32 of 43 <br /> 4100 Atlas Court•Bakersfield,CA 93308®(661)327-4911 ,FAX(661)327-1918 •www.belabs.com <br />