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LABORATORIES, INC. <br /> Herst Associates Project: Misc. Samples Reported: 08/28/2007 11:45 <br /> 4630 South Highway 94 North Outer Road Project Number: NCYC <br /> Saint Charles, MO 63304 Project Manager: David Vasbinder <br /> Volatile Organic Analysis (EPA Method 8260) <br /> Quality Control Repo - 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 BQH1594 Matrix Spike 0709541-01 ND 24.620 25.000 ug/L 98.5 70-130 <br /> Matrix Spike Duplicate 0709541-01 ND 25.360 25.000 ug/L 2.5 101 20 70-130 <br /> Bromodichloromethane BQH1594 Matrix Spike 0709541-01 ND 29.740 25.000 ug/L 119 70-130 <br /> Matrix Spike Duplicate 0709541-01 ND 28.850 25.000 ug/L 3.4 115 20 70-130 <br /> Chlorobenzene BQH1594 Matrix Spike 0709541-01 ND 25.890 25.000 ug/L 104 70-130 <br /> Matrix Spike Duplicate 0709541-01 ND 25.000 25.000 ug/L 3.9 100 20 70-130 <br /> Chloroethane BQH1594 Matrix Spike 0709541-01 ND 25.910 25.000 ug/L 104 70-130 <br /> Matrix Spike Duplicate 0709541-01 ND 26.450 25.000 ug/L 1.9 106 20 70-130 <br /> - <br /> 1,4-Dichlorobenzene BQH1594 Matrix Spike 0709541-01 ND 26.550 25.000 ug/L 106 70-130 <br /> Matrix Spike Duplicate 0709541-01 ND 24.700 25.000 ug/L 7.0 98.8 20 70-130 <br /> 1,1-Dichloroethane BQH1594 Matrix Spike 0709541-01 ND 25.480 25.000 ug/L 102 70-130 <br /> Matrix Spike Duplicate 0709541-01 ND 26.300 25.000 ug/L 2.9 105 20 70-130 <br /> 1,1-Dichloroethene BQH1594 Matrix Spike 0709541-01 ND 27.330 25.000 ug/L 109 70-130 <br /> Matrix Spike Duplicate 0709541-01 ND 27.480 25.000 ug/L 0.9 110 20 70-130 <br /> Toluene BQH1594 Matrix Spike 0709541-01 ND 27.230 25.000 ug/L 109 70-130 <br /> Matrix Spike Duplicate 0709541-01 ND 26.550 25.000 ug/L 2.8 106 20 70-130 <br /> Trichloroethene BQH1594 Matrix Spike 0709541-01 ND 26.750 25.000 ug/L 107 70-130 V11 <br /> Matrix Spike Duplicate 0709541-01 ND 26.380 25.000 ug/L 0. 106 20 70-130 V11 <br /> 1,2-11 Dichloroethane-d4(Surrogate) BQH1594 Matrix Spike 0709541-01 ND 10.480 10.000 ug/L 105 76-114 <br /> Matrix Spike Duplicate 0709541-01 ND 10.830 10.000 ug/L 108 76-114 <br /> Toluene-d8(Surrogate) BQH1594 Matrix Spike 0709541-01 ND 10.170 10.000 ug/L 102 88-110 <br /> Matrix Spike Duplicate 0709541-01 ND 10.250 10.000 ug/L 102 88-110 <br /> 4-Bromofluorobenzene(Surrogate) BQH1594 Matrix Spike 0709541-01 ND 10.480 10.000 ug/L 105 86-115 <br /> Matrix Spike Duplicate 0709541-01 ND 10.000 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 submitting 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)327-4911 •FAX(661)327-1918•www.bclabs.com <br />