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Geosyntec <br /> consultants <br /> 5.4 Project-Specific Matrix Spike/ Matrix Spike Duplicate Samples <br /> MS/MSD sample pairs are sample aliquots that have been spiked by the laboratory with <br /> a known amount of analyte and analyzed per the method. The percent recovery and the <br /> RPD results of the analyte in the MS and the MSD are an indication of analytical precision <br /> and accuracy for the analyte in the given chemical matrix. MS/MSD pairs prepared from <br /> project samples are used to measure these qualities as they apply to the particular matrix <br /> of the project in order to assess potential matrix interferences affecting project sample <br /> analytical results. <br /> 5.5 Laboratory Quality Control Samples <br /> Laboratory QC samples and reference standards will be introduced into the measurement <br /> process to evaluate laboratory performance and sample measurement for all matrices, as <br /> defined by the governing analytical methods. Control samples will be prepared from <br /> environmental samples or be generated from standard materials in the laboratory. <br /> Laboratory QC samples include method blanks, LCSs, and laboratory duplicates, as <br /> appropriate for the method. <br /> Quality Assurance Project Plan 7 7 December 2020 <br />