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LABORATORIES, INC. <br /> Herst Associates Project: Misc.Samples Reported: 08/06/2007 11:10 <br /> 4630 South Highway 94 North Outer Road Project Number: NCYC <br /> North Outer Rd. Project Manager: David Vasbinder <br /> Saint Charles, MO 63304 <br /> Volatile Organic Analysis (EPA Method 8260) <br /> Quality Control Report - Laboratory Control Sample <br /> Control Limits <br /> Spike Percent Percent <br /> Constituent Batch ID QC Sample ID QC Type Result Level PQL Units Recovery RPD Recoveq RPD Lab Quals <br /> Benzene BQH0144 BQH0144-BS1 LCS 24.280 25.000 0.50 ug/L 97.1 70-130 <br /> Bromodichloromethane BQH0144 BQH0144-BS1 LCS 25.680 25.000 0.50 ug/L 103 70-130 <br /> Chlorobenzene BQH0144 BQH0144-BS1 LCS 25.120 25.000 0.50 ug/L 100 70-130 <br /> Chloroethane BQH0144 BQH0144-BS1 LCS 23.960 25.000 0.50 ug/L 95.8 70-130 <br /> 1,4-Dichlorobenzene BQH0144 BQH0144-BSI LCS 24.920 25.000 0.50 ug/L 99.7 70-130 <br /> 1,1-Dichloroethane BQH0144 BQH0144-BSI LCS 24.870 25.000 0.50 ug/L 99.5 70-130 <br /> 1,1-Dichloroethene BQH0144 BQH0144-BSI LCS 25.940 25.000 0.50 ug/L 104 70-130 <br /> Toluene BQH0144 BQH0144-BS1 LCS 25.280 25.000 0.50 ug/L 101 70-130 <br /> Trichloroethene BQH0144 BQH0144-BS1 LCS 27.750 25.000 0.50 ug/L 111 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) BQH0144 BQH0144-BS1 LCS 9.1600 10.000 ug/L 91.6 76-114 <br /> Toluene-d8(Surrogate) BQH0144 BQH0144-BS1 LCS 9.7500 10.000 ug/L 97.5 88-110 <br /> 4-Bromofluorobenzene(Surrogate) BQH0144 BQH0144-BS1 LCS 9.2800 10.000 ug/L 92.8 86-115 <br /> ........._._..-._._... .. <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 28 of 32 <br /> 4100 Atlas Court•Bakersfield,CA 93308•(661)327-4911 •FAX(661)327-1918•www.bclabs.com <br />