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0 <br />0 <br />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 perfonned 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 />L <br />Groundwater Monitoring A-8 Department of Public WOrksfSobd Waste <br />County of San Joaquin <br />C�� <br />