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LABORATORIES, INC. <br /> Herst Associates Project: Misc.Samples Reported: 09/24/2007 8:37 <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 Recovea RPD Recovery Lab Quals <br /> Benzene BQ10811 Matrix Spike 0710769-02 ND 25.090 25.000 ug/L 100 70-130 <br /> Matrix Spike Duplicate 0710769-02 NO 25.060 25.000 ug/L 0 100 20 70-130 <br /> Bromodichloromethane BQ10811 Matrix Spike 0710769-02 NO 28.590 25.000 ug/L 114• 70-130 <br /> Matrix Spike Duplicate0710769-02 ND 28.770 25.000 ug/L 0.9 115 20 70-130 <br /> Chlorobenzene BQ10811 Matrix Spike 0710769-02 ND 25.480 25.000 ug/L 102 70-130 <br /> Matrix Spike Duplicate 0710769-02 ND 25.190 25.000 ug/L 1.0 101 20 70-130 <br /> Chloroethane BQ10811 Matrix Spike 0710769-02 ND 24.830 25.000 ug/L 99.3 70- 130 <br /> Matrix Spike Duplicate 0710769-02 ND 26.490 25.000 ug/L 6.5 106 20 70-130 <br /> 1,4-Dichlorobenzene BQ10811 Matrix Spike 0710769-02 ND 25.410 25.000 ug/L 102 70-130 <br /> Matrix Spike Duplicate 0710769-02 ND 25.060 25.000 ug/L 2.0 100 20 70-130 <br /> 1,1-Dichloroethane BQ10811 Matrix Spike 0710769-02 NO, 24.470 25.000 ug/L 97.9 70-130 <br /> Matrix Spike Duplicate 0710769-02 ND 24.700 25.000 ug/L 0.9 98.8 20 70-130 <br /> 1,1-Dichloroethene BQ10811 Matrix Spike 0710769-02 NO 27.050 25.000 ug/L 108 70-130 <br /> Matrix Spike Duplicate 0710769-02 NO 27.270 25.000 ug/L 0.9 109 20 70-130 <br /> Toluene BQ10811 Matrix Spike 0710769-02 NO 26.040 25.000 ug/L 104 70-130 <br /> Matrix Spike Duplicate 0710769-02 NO 26.270 25.000 ug/L 1.0 105 20 70-130 <br /> Trichloroethene BQ10811 Matrix Spike 0710769-02 0.26000 26.940 25.000 ug/L 107 70-130 <br /> Matrix Spike Duplicate 0710769-02 0.26000 26.680 25.000 ug/L 0.9 106 20 70-130 <br /> ... _ ........ .... <br /> 1,2-Dichloroethane-d4(Surrogate) BQ10811 Matrix Spike 0710769-02 ND 10.550 10.000 ug/L 106 76-114 <br /> Matrix Spike Duplicate 0710769-02 ND 10.730 10.000 ug/L 107 76-114 <br /> Toluene-d8(Surrogate) B010811 Matrix Spike 0710769-02 ND 10.120 10.000 ug/L 101 88-110 <br /> Matrix Spike Duplicate 0710769-02 ND 10.050 10.000 ug/L 100 88-110 <br /> 4-Bromofluorobenzene(Surrogate) B01081 Matrix Spike 0710769-02 ND 9.9800 10.000 ug/L 99.8 86-115 <br /> Matrix Spike Duplicate 0710769-02 ND 9.8700 10.000 ug/L 98.7 86-115 <br /> BC Laboratories The results in this report apply to the samples analyzed in accordance=with the chain of custody document. phis analytical report must be reproduced in its entirety. <br /> All results listed in this report are for the exclusive use or 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 />