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n J n U Laboratory QA procedures include those required under the DHS hazardous waste testing program. Specific laboratory QA- procedures are included in the laboratory QA manual for surrogate recoveries, matrix spike recoveries, and matrix spike duplicate (or duplicate) results. Method blanks are analyzed daily to assess the effect of the laboratory environment on the analytical results. Method blanks are performed for each sample analyzed. Each sample to be analyzed for organic parameters will contain surrogate spike compounds. The surrogate recoveries are used to determine if the analytical instruments are operating within limits. Surrogate recoveries are compared to control limits established and updated by the laboratory based on its historical operation. Matrix spikes are analyzed at a frequency of approximately 10 percent. Matrix spike results are evaluated to determine whether the sample matrix is interfering with the laboratory analysis and to provide a measure of the accuracy of the analytical data. Matrix spike recoveries are compared to control limits established and updated by the laboratory based on its historical operation. Laboratory duplicates are analyzed at a frequency of approximately 10 percent. Spike duplicate results are evaluated to determine the reproducibility (precision) of the analytical method. Reproducibility values are compared to control limits established and updated by the laboratory based on its historical operation. Laboratory QC data is included with the analytical results. This QC data includes method blanks, surrogate spike recoveries (for organic parameters only), matrix spike recoveries, and matrix spike duplicates. Groundwater Monitoring A-8 Department of Public Works/Solid Waste County of San Joaquin QUALITY ASSURANCE/QUALITY CONTROL Quality assurance/quality control (QA/QC) measures are taken to confirm the integrity of the field and laboratory data generated during the monitoring program An evaluation of the field and laboratory quality assurance data is included in the technical reports. Field Quality Assurance Procedures Field QA procedures are included in each monitoring event and include the documentation of field instrument calibration. Laboratory Quality Assurance Procedures n U Laboratory QA procedures include those required under the DHS hazardous waste testing program. Specific laboratory QA- procedures are included in the laboratory QA manual for surrogate recoveries, matrix spike recoveries, and matrix spike duplicate (or duplicate) results. Method blanks are analyzed daily to assess the effect of the laboratory environment on the analytical results. Method blanks are performed for each sample analyzed. Each sample to be analyzed for organic parameters will contain surrogate spike compounds. The surrogate recoveries are used to determine if the analytical instruments are operating within limits. Surrogate recoveries are compared to control limits established and updated by the laboratory based on its historical operation. Matrix spikes are analyzed at a frequency of approximately 10 percent. Matrix spike results are evaluated to determine whether the sample matrix is interfering with the laboratory analysis and to provide a measure of the accuracy of the analytical data. Matrix spike recoveries are compared to control limits established and updated by the laboratory based on its historical operation. Laboratory duplicates are analyzed at a frequency of approximately 10 percent. Spike duplicate results are evaluated to determine the reproducibility (precision) of the analytical method. Reproducibility values are compared to control limits established and updated by the laboratory based on its historical operation. Laboratory QC data is included with the analytical results. This QC data includes method blanks, surrogate spike recoveries (for organic parameters only), matrix spike recoveries, and matrix spike duplicates. Groundwater Monitoring A-8 Department of Public Works/Solid Waste County of San Joaquin