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QUALITY ASSURANCE/QUALITY CONTROL <br /> Quality assurance/quality control(QA/QC)measures are taken to confirm the integrity of the field and <br /> laboratory data generated during the monitoring program. An evaluation of the field and laboratory <br /> 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 recoveries, <br /> 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 limits. <br /> Surrogate recoveries are compared to control limits established and updated by the laboratory <br /> 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 to <br /> provide a measure of the accuracy of the analytical data. Matrix spike recoveries are compared to <br /> control limits established and updated by the laboratory based on its historical 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 blanks, <br /> surrogate spike recoveries (for organic parameters only), matrix spike recoveries, and matrix spike <br /> duplicates. <br /> Groundwater Monitoring A-8 Department of Public Works/Solid Waste <br /> County of San Joaquin <br />