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TOEM 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 /> ater Analysis (Metals) <br /> Quality Control Report - Precision & Accuracy <br /> Control Limits <br /> Source Source Spike Percent Percent <br /> Constituent Batch ID QC Sample TyE2 Sample ID Result Result Added Units RPD Recovery RPD Recoveg Lab Quals <br /> Hexavalent Chromium BRL0850 Duplicate 0816108-07 13.005 13.201 ug/L 1.5 10 <br /> Matrix Spike 0816108-07 13-005 64.337 52.632 ug/L 97.5 85-115 <br /> Matrix Spike Duplicate 0816108-07 13.005 64.058 52.632 ug/L 0.5 97.0 10 85-115 <br /> Mercury BRL0973 Duplicate 0816136-01 ND ND ug/L 20 <br /> Matrix Spike 0816136.01 ND 1.0050 1.0000 ug/L 100 70-130 <br /> Matrix Spike Duplicate 0816136-01 ND 1.0050 1.0000 ug/L 0 100 20 70-130 <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 entirely. <br /> All results listed in this report are for the exclusive use of the submitting party. 13C Laboratoriesmes no responsibility for report alteration,separation,detachment or third party interpretation. <br /> 4100 Atlas Court Bakersfield,CA 93308 (61W7--'4'911 FAX(661)327-1998 www.bdabs.com age 31 of 54 <br /> Certifications: Calitomia-ELAP Certification N1186; FAX <br /> Administrative Code-NAC-445A <br />