About this document
The guidance reflects the collective, twenty-plus year experience of a large group of local, national and international environmental experts trained in Gy’s Theory of Sampling. The guidance focuses on the use of “Decision Unit (DU)” and “Multi Increment® Sample” investigation methods for characterization of environmental media. (Multi Increment is a registered trademark of EnviroStat, Inc.). This can also be thought of as “risk-based” sampling methodology. Although primarily focused on soil, the methods introduced are also applicable to the investigation of contaminated sediment and other particulate media.