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5.1.5 Preventative Maintenance <br /> The Consultant Field Manager is responsible for documenting the maintenance of all field <br /> equipment according to the manufacturer's specifications. Scheduled maintenance will be <br /> performed by appropriately trained personnel. Calibration, use, and field equipment maintenance <br /> procedures are provided in the FSP. The analytical laboratory is responsible for all analytical <br /> equipment calibration and maintenance as described in the QA plan. Subcontractors are <br /> responsible for maintenance of all equipment needed to implement their scopes of work. <br /> 5.2 Precision,Accuracy, Representativeness, Comparability, and Completeness <br /> The elements of data quality will be evaluated as discussed in the following subsections. If <br /> laboratory-specific precision and accuracy limits are not specified, then the QC limits presented <br /> in the following sections must be met. <br /> 5.2.1 Precision <br /> Precision measures the reproducibility of repetitive measurements. It is defined as the degree of <br /> mutual agreement among independent measurements as a result of the repeated application of the <br /> sample process under similar conditions. <br /> Analytical precision is a measurement of the variability associated with duplicate or replicate <br /> analyses of the same sample in the laboratory and is determined by analysis of laboratory 00 <br /> samples, such as duplicate control samples, matrix spike duplicates, or field sample duplicates. If <br /> the recoveries of analytes in the specified control samples are comparable within established <br /> control limits,then precision is within limits. <br /> Total precision is a measurement of the variability associated with the entire sampling and <br /> analytical process. It is determined by analysis of duplicate or replicate field samples and <br /> measures variability introduced by both the laboratory and field procedures. Field duplicate <br /> samples are analyzed to assess field and analytical precision. <br /> Environmental/LNC/workplan/Appendix3.wpd 9 <br />