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1 <br /> will be compared to control limits established and updated by the labora- <br /> tory based on its historical operation. <br /> Matrix spikes will be analyzed at a frequency of approximately 10 percent. <br /> Matrix spike results will be evaluated to determine whether the sample <br /> matrix is interfering with the laboratory analysis and to provide a measure <br /> of the accuracy of the analytical data. Matrix spike recoveries will be com- <br /> pared to control limits established and updated by the laboratory based on <br /> its historical operation. <br /> Laboratory duplicates will be analyzed at a frequency of approximately <br /> 10 percent. Spike duplicate results will be evaluated to determine the <br />' reproducibility (precision) of the analytical method. Reproducibility values <br /> will be compared to control limits established and updated by the labora- <br /> tory based on its historical operation. <br /> Laboratory QA/QC data will be included with the analytical results. This <br /> QA/QC data will include method blanks, surrogate spike recoveries (for <br /> organic parameters only), matrix spike recoveries, and matrix spike dupli- <br /> cates. <br /> I <br />' PM24920201 a C - 10 Rev. 0 June 1, 1992 <br />