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LABORATORIES, INC. <br /> Herst Associates Project: Misc. Samples Reported: 06/29/2007 11:04 <br /> 4630 South Highway 94 North Outer Road Project Number: NCYC VOC 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 BQF1033 Matrix Spike 0706047-42 ND 23.100 25.000 ug/L 92.4 70-130 <br /> Matrix Spike Duplicate 0706047-42 ND 23.460 25.000 ug/L 1.5 93.8 20 70-130 <br /> Chlorobenzene BQF1033 Matrix Spike 0706047-42 ND 22.970 25.000 ug/L 91.9 70-130 <br /> Matrix Spike Duplicate 0706047-42 ND 23.600 25.000 ug/L 2.7 94.4 20 70-130 <br /> Chloroethane BQF1033 Matrix Spike 0706047-42 ND 20.360 25.000 ug/L 81.4 70-130 <br /> Matrix Spike Duplicate 0706047-42 ND 21.670 25.000 ug/L 6.3 86.7 20 70-130 <br /> 1,4-Dichlorobenzene BQF1033 Matrix Spike 0706047-42 ND 24.220 25.000 ug/L 96.9 70-130 <br /> Matrix Spike Duplicate 0706047-42 ND 24.900 25.000 ug/L 2.7 99.6 20 70-130 <br /> 1,1-Dichloroethane BQF1033 Matrix Spike 0706047-42 ND 21.720 25.000 ug/L 86.9 70-130 <br /> Matrix Spike Duplicate 0706047-42 ND 22.380 25.000 ug/L 2.9 89.5 20 70-130 <br /> 1,1-Dichloroethene BQF1033 Matrix Spike 0706047-42 ND 20.360 25.000 ug/L 81.4 70-130 <br /> Matrix Spike Duplicate 0706047-42 ND 21.280 25.000 ug/L 4.4 85.1 20 70-130 <br /> Toluene BQF1033 Matrix Spike 0706047-42 ND 21.770 25.000 ug/L 87.1 70-130 <br /> Matrix Spike Duplicate 0706047-42 ND 22.580 25.000 ug/L 3.6 90.3 20 70-130 <br /> Trichloroethene BQF1033 Matrix Spike 0706047-42 ND 21.220 25.000 ug/L 84.9 70-130 <br /> Matrix Spike Duplicate 0706047-42 ND 22.030 25.000 ug/L 3.7 88.1 20 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) BQF1033 Matrix Spike 0706047-42 ND 9.7000 10.000 ug/L 97.0 76-114 <br /> Matrix Spike Duplicate 0706047-42 ND 9.3000 10.000 ug/L 93.0 76-114 <br /> Toluene-d8(Surrogate) BQF1033 Matrix Spike 0706047-42 ND 9.9800 10.000 ug/L 99.8 88-110 <br /> Matrix Spike Duplicate 0706047-42 ND 10.070 10.000 ug/L 101 88-110 <br /> 4-Bromofluorobenzene(Surrogate) BQF1033 Matrix Spike 0706047-42 ND 10.200 10.000 ug/L 102 86-115 <br /> Matrix Spike Duplicate 0706047-42 ND 10.140 10.000 ug/L 101 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 /> 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 22 of 30 <br /> 4100 Atlas Court•Bakersfield,CA 93308 •(661)327-4911 •FAX(661)327-1918 •www.bciabs.com <br />