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Soil Sampling Quality Assurance User's Guide Published 1989
Reliable environmental decisions require data of known quality, which in turn requires an adequate QA/QC program to identify and control sources of error. When investigating a relatively inhomogeneous medium such as soil, the sampling component introduces much greater error than the analytical component. This document explains vital aspects of a representative sampling and analysis design, such as the concept of 'sample support,' using real-world examples and detailed discussion.
EPA 600-8-89-046

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