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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 /> 5AC/pj2\252C\25201000 ld1-941fc 1 A-9 Rev 0 10/11/94 <br />