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= LABORATORIES, INC. <br /> Herst:Associates4630 uth Highway 94 North Outer Road Project: Misc. Samples Reported: 08/28/2007 11:45 <br /> Saint arles, MO 63304 Project Number: NCYC <br /> Project Manager: David Vasbinder <br /> Volatile Organic Analysis (EPA Method 8260) <br /> Quality Control Report - method Blank Analysis <br /> Constituent Batch ID <br /> QC Sample ID MB Result Units PQL MDL Lab Quals <br /> trans-1,4-Dichloro-2-butene 3QH1594 <br /> BQH1594-BLK1 ND ug/L <br /> Diisopropyl ether - - 5.0 2.0 <br /> BQH1594 _ <br /> H1594-BLK1 ND _ <br /> Ethanol ug/L 0.50 0.34 <br /> BQH1594 <br /> BQH1594 BLK1 ND ug/L 250 _ <br /> Ethyl t-butyl ether - BQH1594 - 57 <br /> __ BQH1594-BLK1 <br /> _ ND ug/L 0.50 0.32 <br /> 2-Hexanone _ BQH1594 _ — _ <br /> BQH1594-BLK1ND ug/L 10 <br /> Methyl ethyl ketone - - — - _ 2.2 <br /> BQH1594 <br /> BQH1594-BLK1 <br /> Methyl iodide _ _ ND _ ug/L 10 3.4 <br /> BQH1594 BQH1594-BLK1 ND <br /> ug/L 2.0 0.33 <br /> Methyl isobutyl ketone.._ BQH1594 - - <br /> - BQH1594-BLK1 ND ug/L 10 <br /> Vinyl acetate 3.6 <br /> BQH1594 BQH1594-BLK1 ND ug/L <br /> 1,2-Dichloroethane-d4(Surrogate) 10 4.7 <br /> _ - BQH1594 BQH1594-BLK1 107 % _ <br /> Toluene-d8(Surrogate) - - - 76-114 (LCL-UCL) <br /> BQH1594 BQH1594-BLKI 99.3 % _ <br /> 4-Bromofluorobenzene(Surrogate) <br /> 88-110 (LCL-UCL) <br /> BQH1594 <br /> BQH1594 BLK1 106 % 86 115 (LCL-UCL) _ <br /> BC Laboratories The results in this PPY report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety. <br /> P <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.bclabs.com Page 31 of 32 <br />