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GeosyntecO <br /> consultants <br /> 5.4 Proiect-Specific Matrix Spike (MS)/Matrix Spike Duplicate (MSD) <br /> 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 of the analyte in the MS and the MSD are indications of analytical accuracy and <br /> precision, respectively, for the analyte in the given chemical matrix. MS/MSD pairs <br /> prepared from project samples are used to measure these qualities as they apply to the <br /> specific matrix of the project in order to assess potential matrix interferences affecting <br /> project sample analytical results. Samples will be identified for project-specific MS/MSD <br /> analysis at a frequency of 1 per 20 primary samples, per matrix, as part of the sampling <br /> activities conducted. <br /> 5.5 Laboratory Quality Control Samples <br /> Laboratory QC samples, or 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 but are not limited to method blanks, laboratory control <br /> samples (LCS), laboratory duplicates, and matrix spike samples. <br /> Quality Assurance Project Plan 9 30 April 2025 <br />