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LABORATORY CONTROL SAMPLE <br />QUALITY CONTROL REPORT <br />Analyzed By: J. Yah <br />Twining Laboratories, Inc. Examination Number: 69905581.1-2 <br />Reviewed By: J. Creager <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 />AROCLOR 1016 <br />NO <br />.15 <br />.143 <br />.141 <br />95 <br />94 <br />1 <br />AROCLOR 1260 <br />NO <br />.15 <br />.156 <br />.154 <br />104 <br />103 <br />1 <br />EXPLANATIONS: <br />All concentrations in mg/Kg: Milligrams per kilogram (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 05/97 (MMM <br />