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instruments are operating within limits. Surrogate recoveries will be compared to control <br /> limits established and updated by the laboratory based on its historical operation. <br /> Matrix spikes will be analyzed at a frequency of approximately 10 percent. Matrix spike <br /> results will be evaluated to determine whether the sample matrix is interfering with the <br /> laboratory analysis and to provide a measure of the accuracy of the analytical data. Matrix <br /> spike recoveries will be compared to control limits established and updated by the <br /> laboratory based on its historical operation. <br /> Laboratory duplicates will be analyzed at a frequency of approximately 10 percent. Spike <br /> duplicate results will be evaluated to determine the reproducibility (precision) of the <br /> analytical method. Reproducibility values will be compared to control limits established <br /> and updated by the laboratory based on its historical operation. <br /> Laboratory QA/QC data will be included with the analytical results. This data will include <br /> method blanks, surrogate spike recoveries (for organic parameters only), matrix spike <br /> recoveries, and matrix spike duplicates. <br /> SAC/pjO\0939\09390040.8e1-95 Ifc:3 A-9 Rev.0 February 14, 1995 <br />