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Guidance for Obtaining Representative Laboratory Analytical Subsamples from Particulate Laboratory Samples Published 2003
This guidance provides education and instruction for managing a potential weakness in environmental data quality for solid materials. Representative data are the foundation of correct decisions and effective remedial designs. This document shows how analytical subsampling is a crucial link for representative samples. It defines 'sample representativeness' in terms of the population of interest to the decision, which may or may not be based on a bulk average. Examples show how careless subsampling can severely bias analytical results.
EPA 600-R-03-027

Download Guidance (2.9MB/156pp/PDF)

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