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® LABORATORIES, INC. <br /> Herst Associates Project: Misc.Samples Reported: 10/23/2007 12:20 <br /> 4630 South Highway 94 North Outer Road Project Number: NCYC <br /> Saint Charles, MO 63304 Project Manager: David Vasbinder <br /> Volatile Organic AnalysisMethod 8260) <br /> Quality Control Report - Precision & Accuracy <br /> `- Control Limits <br /> Source Source Spike Percent Percent <br /> Constituent Batch lD QC Sample Ty <br /> pe Sample ID Result Result Added Units RPD Recove RPD RecovenLLqb Quals <br /> Benzene BQJ1250 Matrix Spike 0711973-01 0 26-360 25.000 ug/L 105 70-130 <br /> Matrix Spike Duplicate 0711973-01 0 28.310 25.000 ug/L 7.3 113 20 70-130 <br /> __.._ ........---- .. ........_. ._...__.-_ --- --- ----- .. _- __.. <br /> Bromodichloromethane BQJ1250 Matrix Spike 0711973-01 0 25.080 25.000 ug/L 100 70-130 <br /> Matrix Spike Duplicate 0711973-01 0 25.440 25.000 ug/L 2.0 102 20 70-130 <br /> - - ---- ........ _ ....- ...--.._.. -p. . __ .._. _..__... - -- -- <br /> Chlorobenzene BQJ1250 Matrix S ike 0711973-01 0 26.330 25.000 ug/L 105 70-130 <br /> Matrix Spike Duplicate 0711973-01 0 27.640 25.000 ug/L 5.6 111 20 70-130 <br /> ...-- - _...__.... __._ _.._........-. - - --.._ _._..._- ...---.. - --..... .. <br /> Chloroethane BQJ 1250 Matrix Spike 0711973-01 0 28.100 25.000 ug/L 112 70-130 <br /> Matrix Spike Duplicate 0711973-01 0 29.710 25.000 ug/L 6.1 119 20 70-130 <br /> 1,4-Dichlorobenzene BQJ 1250 Matrix Spike 0711973-01 0 26.220 25.000 ug/L 105 70-130 <br /> Matrix Spike Duplicate 0711973-01 0 26.990 25.000 ug/L 2.8 108 20 70-130 <br /> _ ... _.. _._..... . ---p -- ._ -._ _._.......... - -. _.... . _... <br /> 1,1-Dichloroethane BQJ1250 Matrix Spike 0711973-01 0 26.650 25.000 ug/L 107 70-130 <br /> Matrix Spike Duplicate 0711973-01 0 28.270 25.000 ug/L 5.5 113 20 70-130 <br /> ----- __ _..... -- ._-- . .._ -_ .__..-- __.._._._ .......- _. . _. ....._ __ .. _... <br /> 1,1 Dichloroethene BQJ1250 Matrix Spike 0711973-01 0 26.670 25.000 ug/L 107 70-130 <br /> Matrix Spike Duplicate 0711973-01 0 27.980 25.000 ug/L 4.6 112 20 .....70-130 <br /> -...... . __.._ .......---p . <br /> Toluene BQJ1250 Matrix S ike 0711973-01 0 26.230 25.000 ug/L 105 70-130 <br /> Matrix Spike Duplicate 0711973-01 0 26.680 25,000 ug/L 1.9 107 20 70-130 <br /> _...., - _-..__.-- <br /> _... <br /> Trichloroethene BQJ1250 Matrix Spike 0711973-01 0 25.280 25.000 ug/L 101 70-130 <br /> Matrix Spike Duplicate 0711973-01 0 26.330 25.000 ug/L 3.9 105 20 7110, 13b <br /> -..-._..... _ .._ --- ......._ -- --- -- _...... --....- .. _ - _ _. <br /> 1,2-Dichloroethane-d4(Surrogate) BQJ1250 Matrix Spike 0711973-01 ND 9.7200 10.000 ug/L 97.2 76-114 <br /> Matrix Spike Duplicate 0711973-01 ND 9.9900 10.000 ug/L 99.9 76-114 <br /> ....._......--.._. - ............. . -..._._. ---- -._ _..._... . .- .._........ __ .... .. _ ._ __.-...-.. -....... <br /> Toluene-d8(Surrogate) BQJ1250 Matrix Spike 0711973-01 ND 10,080 10.000 ug/L 101 88-110 <br /> Matrix Spike Du..... 88-110...... _. ...... ---- _. _.-_ - ..... _... <br /> 4-Bromofluorobenzene(Surrogate) BQJ1250 Matrix Spike 0711973-01 ND 10.440 10.000 ug/L 104 86-115 <br /> Matrix Spike Duplicate 0711973-01 ND 10.050 10.000 ug/L 100 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 submittingm <br /> party.BC Laboratories,Inc,assumes no responsibility for report alteration,separation, detachment or third party interpretation. page 27 of 32 <br /> 4100 Atlas Court•Bakersfield,CA 93308•(661)327-491.1 •FAX(661)327-1918 •www.bclabs.com <br />