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i <br /> Laboratory duplicates were analyzed at a frequency of approximately 10 percent. Spike <br /> duplicate results were evaluated to determine the reproducibility (precision) of the <br /> analytical method. Reproducibility values were compared to control limits established and <br /> updated by the laboratory based on its historical operation. <br /> Laboratory QA/QC data were included with the analytical results. This QA/QC data <br /> included method blanks, surrogate spike recoveries (for organic parameters only), matrix <br /> spike recoveries, and matrix spike duplicates. <br /> • <br /> SACH`-\PJ2\25Z0Q5201000.1 PS 94\pm:1 A-10 Rev.0,4111 P)= <br />