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Method blanks were analyzed daily to assess the effect of the laboratory <br /> ' environment on the analytical results. Method blanks were performed for <br /> each parameter analyzed. <br /> ' Each sample to be analyzed for organic parameters contained surrogate <br /> spike compounds. The surrogate recoveries were used to determine if the <br /> analytical instruments were operating within limits. Surrogate recoveries <br /> ' were compared to control limits established and updated by the laboratory <br /> based on its historical operation. <br /> Matrix spikes were analyzed at a frequency of approximately 10 percent. <br /> Matrix spike results were evaluated to determine whether the sample matrix <br /> was interfering with the laboratory analysis and to provide a measure of the <br /> accuracy of the analytical data. Matrix spike recoveries were compared to <br /> ' control limits established and updated by the laboratory based on its <br /> historical operation. <br /> Laboratory duplicates were analyzed at a frequency of approximately <br /> 10 percent. Spike duplicate results were evaluated to determine the <br /> reproducibility (precision) of the analytical method. Reproducibility values <br /> ' were compared to control limits established and updated by the laboratory <br /> based on its historical operation. <br /> Laboratory QA/QC data were included with the analytical results. This <br /> QA/QC data included method blanks, surrogate spike recoveries (for <br /> organic parameters only), matrix spire recoveries, and matrix spire <br />' duplicates. <br /> 1 <br /> pj010f9010f900020.1 ag D - 8 Rev. 0 December 15, 1992 <br />