ITRC publishes documents that broaden and deepen technical knowledge and expedite quality decision-making when faced with environmental challenges. ITRC has produced documents ranging from technical overviews and case studies of innovative remediation technologies to technical and regulatory guidance documents for applying cleanup technologies. ITRC documents are written and reviewed by teams of environmental professionals, including state and federal environmental regulators, federal agency representatives, industry experts, community stakeholders, and academia. With private and public sector members from all 50 states, the District of Columbia, and Puerto Rico, ITRC documents truly provide a national perspective.
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Understanding the complexity of subsurface geologic conditions is paramount in improving DNAPL site characterization. This guidance document reviews the current knowledge of DNAPLs and their subsurface contaminant behavior. Using an integrated site characterization (ISC) approach, under which data of adequate resolution are collected to fully characterize a site, this new guidance describes how data can be aligned on contaminant distribution with site geologic heterogeneity and groundwater flow conditions at a spatial resolution appropriate to the site-specific remedial objectives. Thus, with the current understanding of subsurface contaminant behavior, both existing and new tools and techniques can be used to measure physical, chemical, and hydrologic subsurface parameters to better characterize the subsurface.