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Laboratory Quality Assurance Procedures Laboratory quality assurance procedures included those required under the DHS hazardous waste testing program. Specific laboratory quality ' assurance procedures were included in the laboratory QA manual for surrogate recoveries, matrix spike recoveries, and matrix spike duplicate (or duplicate) results. Method blanks were analyzed daily to assess the effect of the laboratory environment on the analytical results. Method blanks were performed for each parameter analyzed. Each sample analyzed for organic parameters contained surrogate spike compounds. The surrogate recoveries were used to determine if the ana- lytical instruments were operating within limits. Surrogate recoveries were compared to control limits established and updated by the laboratory based on its historical operation. Matrix spikes were analyzed at a frequency of approximately 10 percent. Matrix spike results were evaluated to determine whether the sample matrix is interfering with the laboratory analysis and to provide a measure AdIk of the accuracy of the analytical data. Matrix spike recoveries were com- pared to control limits established and updated by the laboratory based on its historical operation. Laboratory duplicates were analyzed at a frequency of approximately 10 percent. Spike duplicate results were evaluated to determine the repro- ducibility (precision) of the analytical method. Reproducibility values were ' compared to control limits established and updated by the laboratory based on its historical operation. ' Laboratory QC data were included with the analytical results. This QC data will include method blanks, surrogate spike recoveries (for organic ' parameters only), matrix spike recoveries, and matrix spike duplicates. 0 pj9\939\9390111 c A-9 Rev. 0 September 9, 1992