QAQC Measures

A quality assurance/quality control program should be developed and implemented as part of a long-term monitoring program to provide assessment of techniques used during sample collection, storage, and analysis (EPA 1979b, 1980). EPA programs require QA/QC plans to be approved by the EPA prior to sample collection and analysis. The QA/QC plan should specify sample collection and preservation methods, maximum sample holding time, chain-of-custodian procedure, analytical techniques, accu racy and precision checks, detection limits, and data recording and documentation procedures.

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