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The laboratories selected to perform the analytical work are certified by the Department of Health <br /> Services (DHS) for hazardous waste testing. Maximum sample holding times are observered based <br /> on the respective analytical test method(Table A-2). <br /> QUALITY ASSURANCE/QUALITY CONTROL <br /> Quality assurance/quality control (QA/QC) measures are taken to confirm the integrity of the field <br /> and laboratory data generated during the monitoring program. An evaluation of the field and <br /> laboratory quality assurance data is included in the technical reports. <br /> Field Quality Assurance Procedures <br /> Field QA procedures are included in each monitoring event and include the documentation of field <br /> instrument calibration. <br /> Laboratory Quality Assurance Procedures <br /> Laboratory QA procedures include those required under the DHS hazardous waste testing program. <br /> Specific laboratory QA procedures are included in the laboratory QA manual for surrogate <br /> recoveries,matrix spike recoveries, and matrix spike duplicate(or duplicate)results. <br /> Method blanks are analyzed daily to assess the effect of the laboratory environment on the <br /> analytical results. Method blanks are performed for each sample analyzed. <br /> Each sample to be analyzed for organic parameters will contain surrogate spike compounds. The <br /> surrogate recoveries are used to determine if the analytical instruments are operating within <br /> limits. Surrogate recoveries are compared to control limits established and updated by the <br /> laboratory based on its historical operation. <br /> Matrix spikes are analyzed at a frequency of approximately 10 percent. Matrix spike results are <br /> evaluated to determine whether the sample matrix is interfering with the laboratory analysis and <br /> to provide a measure of the accuracy of the analytical data. Matrix spike recoveries are <br /> compared to control limits established and updated by the laboratory based on its historical <br /> operation. <br /> Laboratory duplicates are analyzed at a frequency of approximately 10 percent. Spike duplicate <br /> results are evaluated to determine the reproducibility (precision) of the analytical method. <br /> Reproducibility values are compared to control limits established and updated by the laboratory <br /> based on its historical operation. <br /> Laboratory QC data is included with the analytical results. This QC data includes method <br /> blanks, surrogate spike recoveries (for organic parameters only), matrix spike recoveries,' and <br /> matrix spike duplicates. <br /> - NWiscellaneous\Groundwater Info-All Sites\SAP Appendixkdoc <br /> A-8 <br />