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