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Laboratories Inc. <br /> Environmental Testing Laboratory Since 1949 <br /> Herst Associates Project: Austin Road/NCYCC Drilling Reported: 12/19/2008 13:17 <br /> 4630 South Highway 94 North Outer Road Project Number: [none] <br /> Saint Charles, MO 63304 Project Manager: David Vasbinder <br /> Chlorinated Herbicides (EPA Method 8151) <br /> Quality Control Report - Laboratory Control Sample <br /> Control Limits <br /> Spike Percent Percent <br /> Constituent Batch ID QC Sam le lD OCType, Result Level PQL Units Recoveg RPD Recovery RPD Lab Qualls <br /> 2,4-D BRL1087 BRL1087-BSI LCS 2.9200 2.0000 0.40 ug/L 146 69-121 L01,V11 <br /> Dinoseb BRL1087 BRL1087-BS1 LCS 0.98000 1.0000 0.20 ug/L 98.0 42-128 <br /> 2,4,5-T BRL1087 BRL1087-BS1 LCS 0.58000 0,60000 0.090 ug/L 96.7 55-146 VII <br /> .......... <br /> .__.. <br /> 2,4,5-TP(Silvex) BRL1087 BRL1087-BS1 LCS 0.97000 0.60000 0.070 ug/L 162 67-161 1.01 <br /> 2,4-Dichlorophenylacetic acid(Surroga BRL1087 BRL1087-BSI LCS 0.82000 1.0000 ug/L 82.0 50-128 <br /> The results in this relwrt apply,to the samples analyaed in accordance with the chain of custody document.This analytical report must be reproduced in its entirety. <br /> Ali results listed in this report are for the exclusive use of the submitting party. BC Laboratoricidiwssumes no responsibility for report alteration,separation,detachment or third party intennetaticm. <br /> 4100 Atlas Court Bakersfield,CA 93308 (t 7-4911 FAX(661)327-1918 wwwr.bciabs.com age 33 of 54 <br /> Certifications: California-ELAP Certification NuIW 1186; Nevada Administrative Code-NAC-445A <br />