18 LABORATORY QUALITY CONTROL - EPA

18 laboratory quality control . Introduction This chapter addresses internal LABORATORY QUALITY CONTROL (QC), the purpose of which is to monitor performance, identify problems, and initiate corrective action. If project requirements are more stringent than typical LABORATORY QC criteria, the project manager and the LABORATORY should confer to see whether the LABORATORY can accommodate the project QC requirements. Project QC. requirements are addressed in Part I of MARLAP. LABORATORY data should be produced under a QUALITY system1 that incorporates planning, implementing, and internal assessment of the work performed by the LABORATORY , including QC. MARLAP fully endorses the need for a LABORATORY QUALITY system and a QUALITY manual that delineates the QUALITY assurance (QA) policies and QC practices of the LABORATORY . A LABORATORY s QUALITY system should ensure that LABORATORY processes and measurements are in statistical CONTROL , which means that the distribution of measured results is stable.

ensuring quality in its work processes, products (items), and services. The quality system provides for planning, implementing, and assessing the work performed by the organization and for carrying out required quality assurance and quality control (ANSI/ASQC E4, 1994). General requirements for testing laboratories can be found in ISO/IEC 17025.

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