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1 <br /> , R <br /> regulatory level or near the PQL for the method. when <br /> performed in duplicate, the percent recovery and relative <br /> percent deviation between the MS and MSD is calculated and <br /> used to assess analytical precision. <br /> PQL: <br /> i <br /> The Practical Quantitation Limit is the lowest level to be <br /> ate+ reliably detected within specified limits of precision and <br /> accuracy during routine laboratory operating conditions on <br /> environmental samples. <br /> Perfor=nCS Audit: <br /> 4Ni <br /> The planned independent check of the operation of a <br /> measurement system to obtain a quantitative measure of the <br /> quality of the data generated by utilizing certified <br /> reference standards. <br /> Precision: <br /> The measure of mutual agreement between a set of replicate <br /> analyses for an analyte without assumption or knowledge of <br /> the true value. Precision can be expressed as standard <br /> deviation from a set of values or as relative percent <br /> deviation from a duplicate sample. <br /> Quality Assurance: <br /> The total integrated program for assuring the reliability of <br /> laboratory data including quality planning, duality <br /> assessment and quality improvement efforts to meet user <br /> requirements at an economical level. Quality Assurance <br /> incorporates procedures for field sampling, sample handling <br /> and storage, analytical quality control and document <br /> -- preparation and review. <br /> Quality Aasurance Project Plan: <br /> The orderly assembly of detailed and specific procedures by <br /> which the laboratory defines how it produces quality data for <br /> a specific project or method. The laboratory has one Quality <br /> Assurance Program but multiple Quality Assurance Project <br /> 20 <br />