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MATRIX SPIKE <br />QUALITY CONTROL REPORT <br />Analyzed By: J. Yah Reviewed By: J. Creager <br />Twining Laboratories, Inc. Examination Number: 69905581.1-2 <br />Constituent <br />Method <br />Blank <br />Result <br />Sample <br />Result <br />Spike <br />Level <br />MS <br />Result <br />MSD <br />Result <br />MS % <br />Rec. <br />MSD % <br />Rec. <br />RPD <br />AROCLOR 1016 <br />ND <br />NO <br />.15 <br />.134 <br />.133 <br />89 <br />89 <br />0 <br />AROCLOR 1260 <br />NO <br />NO <br />.15 <br />.147 <br />.153 <br />98 <br />102 <br />4 <br />EXPLANATIONS: <br />Method Blank: The method blank is used to determine if method analytes or other interferences are present in the <br />laboratory environment, the reagents or apparatus. <br />All concentrations in mg/Kg: Milligrams per kilogram (ppm) <br />Matrix Spike and <br />Matrix Spike Duplicate: A matrix spike is a sample to which a known amount of analyte has been added. The <br />percent recovery and the relative percent difference are assessed to determine the <br />accuracy and precision of the analytical procedure. <br />Rev. 3 05197 IQC.WK51 <br />