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�- Laboratories Inc. <br /> Environmental Testing Laboratory Since 1949 <br /> Herst Associates Project: NCYC Reported- 07/21/2008 16:37 <br /> 4630 South Highway 94 North Outer Road Project Number: [none] <br /> Saint Charles, MO 63304 Project Manager: David Vasbinder <br /> Volatile Organic Analysis (EPA Method 8260) <br /> Quality Control Report - Precision & Accuracy <br /> Control Limits <br /> Source Source Spike Percent Percent <br /> Constituent Batch ID QC Sample T Sam le ID Result Result Added Units RPD Recove RPD Recove Lab Qualls <br /> Benzene BRG1228 Matrix Spike 0807421-92 ND 28.787 25.000 ug/L 115 70-130 <br /> Matrix Spike Duplicate 0807421-92 NO 28.985 25.000 ug/L 0.9 116 20 70-130 <br /> _. <br /> ............. --- - <br /> Bromodichloromethane BRG1228 Matrix Spike 0807421-92 NO 26.502 25.000 ug/L 106 70-130 <br /> Matrix Spike Duplicate 0807421-92 NO 25.736 25.000 ug/L 2.9 103 20 70-130 <br /> Chlorobenzene BRG1228 Matrix Spike 0807421-92 NO 27.087 25.000 ug/L 108 70-130 <br /> Matrix Spike Duplicate 0807421-92 ND 26.235 25.000 ug/L 2.8 105 20 70-130 <br /> Chloroethane BRG1228 Matrix Spike 0807421-92 NO 29.601 25.000 ug/L 118 70-130 <br /> Matrix Spike Duplicate0807421-92 ND 30.217 25.000 ug/L 2.5 121 20 70-130 <br /> ---------- __... -- - - - <br /> 1,4-Dichloroben7ene BRG1228 Matrix Spike 0807421-92 ND 25.859 25.000 ug/L 103 70-130 <br /> Matrix Spike Duplicate 0807421-92 NO 25.501 25.000 ug/L 1.0 102 20 70-130 <br /> 1,1-Dichloroethane BRG1228 Matrix Spike 0807421-92 NO 29,055 25.000 ug/L 116 70-130 <br /> Matrix Spike Duplicate 0807421-92 ND 29.090 25.000 ug/L 0 116 20 70-130 <br /> 1,1-Dichloroethene BRG1228 Matrix Spike 0807421-92 NO 28.543 25.000 ug/L 114 70-130 <br /> Matrix Spike Duplicate 0807421-92 NO 28.776 25.000 ug/L 0.9 115 20 70-130 <br /> Toluene BRG1228 Matrix Spike 0807421-92 NO 28.470 25.000 ug/L 114 70-130 <br /> Matrix Spike Duplicate 0807421-92 NO 27.911 25.000 ug/L 1.8 112 20 70-130 <br /> Trichloroethene BRG1228 Matrix Spike 0807421-92 ND 27.773 25.000 ug/L 111 <br /> 70-130 <br /> Matrix Spike Duplicate 0807421-92 NO 28.376 25.000 ug/L 2.7 114 20 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) BRG1228 Matrix Spike 0807421-92 ND 10.067 10.000 ug/L 101 76-114 <br /> Matrix <br /> 6- <br /> Matrix Spike Duplicate 0807421-92 ND 10.074 10.000 ug/L 101 76-114 <br /> Toluene-d8(Surrogate) BRG1228 Matrix Spike 0807421-92 NO 10.176 10.000 ug/L 102 88-110 <br /> Matrix Spike Duplicate 0807421-92 NO 10.004 10.000 ug/L 100 88-110 <br /> 115 <br /> 4-Bromofluorobenzene(Surrogate) BRG1228 Matrix Spike 0807421-92 NO 11.396 10.000 ug/L 114 - <br /> Matrix Spike Duplicate 0807421-92 NO 9.6784 10.000 ug/L 96.8 86-115 <br /> 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 tarty interpretation. Page 31 of 36 <br /> e A noana /rAi%Q)7_A011 PAX(AA 497-1WA www hr-lahs rnm g <br />