Updated ITRC Incremental Sampling Methodology (ISM) Guidance Released


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Updated ITRC Incremental Sampling Methodology (ISM) Guidance Released

By: George Colvin, CPG, CHMM

The Interstate Technology Regulatory Council (ITRC) has released the new Incremental Sampling Methodology (ISM-2) Update Document. As defined by ITRC, ISM is a structured composite sampling and processing protocol that reduces data variability and provides a reasonably unbiased estimate of the mean contaminant concentration in a volume of soil targeted for sampling. The web-based ISM-2 was developed to build on the original 2012 version (ISM-1) and to reflect advancements in technology and share case studies that provide insight into the potential applications, benefits, and challenges of the approach.


George H. Colvin is a hydrogeologist with over 30 years of consulting experience. Much of his experience has focused on RCRA Corrective Action, RCRA closure, and groundwater investigation, monitoring, and cleanup. He holds a BS in Geology from Ohio University and MS in geology and hydrology from Vanderbilt University. He is a Certified Professional Geologist with the American Institute of Professional Geologists, a registered geologist in Kentucky, Pennsylvania, and Tennessee, and a Certified Hazardous Materials Manager.