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LABORATORY CONTROL SAMPLE" <br />QUALITY CONTROL REPORT <br />Analyzed By: G. Barrett & P. Macias Reviewed By: F. Hoevertsz <br />Twining Laboratories, Inc. Examination Number: 69905996.1-5 <br />Constituent <br />MB <br />Result <br />Spike <br />Level <br />LCS <br />Result <br />LCSD <br />Result <br />LCS <br />% Rec <br />LCSD <br />% Rec. <br />RPD <br />Cadmium (Cd) <br /><0.001 <br />0.04 <br />0.0401 <br />0.0400 <br />100 <br />100 <br />0.25 <br />Chromium (total) <br /><0.05 <br />0.2 <br />0.212 <br />0.212 <br />106 <br />106 <br />0 <br />Lead (Pb) <br /><0.05 <br />0.2 <br />0.195 <br />0.199 <br />97.5 <br />99.5 <br />2.0 <br />Nickel (Ni) <br /><0.05 <br />0.2 <br />0.198 <br />0.198 <br />99.0 <br />99.0 <br />0 <br />Zinc (Zn) <br /><0.05 <br />0.2 <br />0.192 <br />0.195 <br />96.0 <br />97.5 <br />1.55 <br />Chromium, Hexavalent (Cr") <br /><0.005 <br />0.1 <br />0.096 <br />0.095 <br />96 <br />95 <br />1.0 <br />EXPLANATIONS: <br />All concentrations in mg/L: Milligrams per liter (ppm) <br />Method Blank: The method blank is used to determine if method analytes or other interferences are <br />present in the laboratory environment, the reagents or apparatus. <br />Laboratory Control Sample: A laboratory control sample is generated by spiking the analyte into a relatively inert <br />matrix (clean sand or blank water). The laboratory control sample is analyzed <br />exactly like a sample, and its purpose is to determine whether the methodology is in <br />control and whether the laboratory is capable of making accurate and precise <br />measurements. <br />Rev. 3 05197 =MM <br />