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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 /> Benzene BQF0932 Matrix Spike 0706047-41 ND 23.680 25.000 ug/L 94.7 70-130 <br /> Matrix Spike Duplicate 0706047-41 ND 22.660 25.000 ug/L 4.4 90.6 20 70-130 <br /> Bromodichloromethane BQF0932 Matrix Spike 0706047-41 ND 24.960 25.000 ug/L 99.8 70-130 <br /> Matrix Spike Duplicate 0706047-41 ND 23.620 25.000 ug/L 5.5 94.5 20 70-130 <br /> Chlorobenzene BQF0932 Matrix Spike 0706047-41 ND 25.150 25.000 ug/L 101 70-130 <br /> Matrix Spike Duplicate 0706047-41 ND 23.850 25.000 ug/L 5.7 95.4 20 70-130 <br /> Chloroethane BQF0932 Matrix Spike 0706047-41 ND 22.670 25.000 ug/L 90.7 70- 130 <br /> Matrix Spike Duplicate 0706047-41 ND 22.970 25.000 ug/L 1.3 91.9 20 70-130 <br /> 1,4-Dichlorobenzene BQF0932 Matrix Spike 0706047-41 ND 25.930 25.000 ug/L 104 70- 130 <br /> Matrix Spike Duplicate 0706047-41 ND 24.650 25.000 ug/L 5.3 98.6 20 70-130 <br /> 1,1-Dichloroethane BQF0932 Matrix Spike 0706047-41 ND 23.940 25.000 ug/L 95.8 70-130 <br /> Matrix Spike Duplicate 0706047-41 ND 22.830 25.000 ug/L 4.8 91.3 20 70-130 <br /> 1,1-Dichloroethene BQF0932 Matrix Spike 0706047-41 ND 22.340 25.000 ug/L 89.4 70-130 <br /> Matrix Spike Duplicate 0706047-41 ND 22.190 25.000 ug/L 0.7 88.8 20 70-130 <br /> Toluene BQF0932 Matrix Spike 0706047-41 ND 23.860 25.000 ug/L 95.4 70-130 <br /> Matrix Spike Duplicate 0706047-41 ND 22.970 25.000 ug/L 3.7 91.9 20 70-130 <br /> Trichloroethene BQF0932 Matrix Spike 0706047-41 ND 27.760 25.000 ug/L 111 70-130 <br /> Matrix Spike Duplicate 0706047-41 ND 25.140 25.000 ug/L 9.4 101 20 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) BQF0932 Matrix Spike 0706047-41 ND 9.2600 10.000 ug/L 92.6 76-114 <br /> Matrix Spike Duplicate 0706047-41 ND 9.4800 10.000 ug/L 94.8 76-114 <br /> Toluene-d8(Surrogate) BQF0932 Matrix Spike 0706047-41 ND 9.7400 10.000 ug/L 97.4 88-110 <br /> Matrix Spike Duplicate 0706047-41 ND 9.9000 10.000 ug/L 99.0 88-110 <br /> 4-Bromofluorobenzene(Surrogate) BQF0932 Matrix Spike 0706047-41 ND 10.220 10.000 ug/L 102 86-115 <br /> Matrix Spike Duplicate 0706047-41 ND 10.040 10.000 ug/L 100 86-115 <br /> Benzene BQF1033 Matrix Spike 0706047-42 ND 21.590 25.000 ug/L 86.4 70-130 <br /> Matrix Spike Duplicate 0706047-42 ND 22.200 25.000 ug/L 2.7 88.8 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. <br /> 4100 Atlas Court-Bakersfield,CA 93308 -(661)327-4911 -FAX(661)327-1918 -www.belabs.com Page 21 ot'3 0 <br />