­NEW ITRC Incremental Sampling Methodology (ISM-2) Update Document
Incremental Sampling Methodology (ISM) is a structured composite sampling and processing protocol that reduces data variability and provides a reasonably unbiased estimate of mean contaminant concentrations in a volume of soil targeted for sampling. The popular 2012 ITRC document, ISM-1 has been updated to reflect advancements in technology and recent case studies that provide insight into the potential applications, benefits, and challenges of the approach.
ISM provides representative samples of specific soil volumes by collecting numerous increments of soil (typically, 30 to 100) that are combined, processed, and subsampled according to specific protocols. ISM is increasingly used in the environmental field to sample contaminants in soil. Proponents have found that the sampling density afforded by collecting many increments, together with the disciplined processing and subsampling of the combined increments, in most cases yields more consistent and reproducible results than those obtained by more traditional sampling approaches.

About the Document

The ISM-2 web-based document describes the principles and the approaches needed to ensure representative, reproducible, and defensible data during soil sampling. ISM involves planning, sample collection, and laboratory processing and analysis to provide a representative sample with results that more accurately reflect the mean concentration of the area of interest than discrete samples. The ISM document provides you the key principles regarding sampling and sampling error and how ISM reduces those errors to have more confidence in sampling results.

Online ISM training that compliments this updated document will be available in the Spring of 2021!

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