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Geosyntec <br /> consultants <br /> 2. QUALITY ASSURANCE PROJECT PLAN OBJECTIVES <br /> The objectives of the QAPP pertain to the collection of data that are sufficient to evaluate <br /> the possible presence and concentration of constituents in the media of interest. <br /> Therefore, the quality of data gathered in this project can be defined in terms of the <br /> following elements: precision, accuracy, representativeness, completeness, <br /> comparability, and sensitivity (PARCCS). These elements are discussed below. <br /> 2.1 Precision <br /> Precision is a measure of the degree to which two or more measurements are in agreement <br /> and is expressed as the relative percent difference (RPD) between the measurements. <br /> Field precision is assessed through collection and measurement of field duplicate <br /> samples. Laboratory precision is assessed through the calculation of RPD for laboratory <br /> control sample(LCS)/laboratory control sample duplicate(LCSD), laboratory duplicate, <br /> and matrix spike (MS)/matrix spike duplicate (MSD) samples, as appropriate for the <br /> method. <br /> 2.2 Accuracy <br /> Accuracy is the degree of agreement between the observed value and an accepted <br /> reference or true value. Accuracy in the field is assessed through the use of trip blanks, <br /> equipment blanks, field blanks, and through the adherence to all sample handling, <br /> preservation,and holding time requirements.Laboratory accuracy is assessed through the <br /> analysis of MS/MSD, LCS, and surrogate percent (%) recoveries, and through the <br /> analysis of method blanks. <br /> 2.3 Representativeness <br /> Representativeness is the extent to which the sampling design adequately reflects the <br /> environmental conditions of the Site. The data will be considered representative if all <br /> sampling and analysis activities are conducted according to the Work Plan and QAPP. <br /> 2.4 Completeness <br /> Completeness is a measure of the amount of valid data obtained from a measurement <br /> system compared to the amount that was expected to be obtained under normal <br /> conditions. Field completeness is a measure of the amount of valid samples obtained <br /> during sampling for the project. The field completeness objective for this project is <br /> Quality Assurance Project Plan 2 7 December 2020 <br />