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Quality Assurance Project Plan <br />Red Creek Quarry Monitoring Program Section 5: Data Generation and Acquisition 5-4 samples are used to determine the accuracy of the measurement and the prevalence of matrix effects. MS samples are also used in conjunction with MSD samples to evaluate analytical precision. The laboratory will analyze MS samples at a frequency of 1 sample for each batch of up to 20 samples. 5.4.2.5 MSD Samples MSD samples are duplicate samples of MS samples that are used to assess matrix effects on analytical precision. Precision is evaluated by calculating the RPD for the MS and MSD pair. The laboratory will analyze MSD samples at a frequency of 1 sample for each batch of up to 20 samples. 5.4.2.6 Additional QA/QC Requirements The analytical laboratory will have the appropriate facilities to store, prepare, and process samples and appropriate instrumentation and staff to provide data with the required quality within the period dictated by the project. The laboratory shall provide, upon request, information documenting its ability to conduct the analyses with the required level of data quality. Such information may include results from inter-laboratory performance evaluation studies, control charts, summary data from internal QA/QC checks, and results from analyses of certified reference materials. 5.4.3 Data Analysis QC Checks The QC check data may be checked/reviewed for quality by the PM or the QAO at any time during the project and must be checked after the data are collected. Corrective actions, as needed, will be documented in the event that control limits are exceeded. Data qualifiers will be assigned following appropriate data verification/validation procedures.