Archived
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Location
Lexington, Kentucky
Start Date
7-5-2026 10:30 AM
End Date
7-5-2026 11:00 AM
Description
The United States Environmental Protection Agency's (US EPA's) May 2024 Legacy Coal Combustion Residuals (CCR) Rule aims to address potential releases and associated risks from legacy surface impoundments and CCR management units (CCRMUs) that were not regulated under the 2015 CCR Rule. As part of the 2024 rule, US EPA conducted several risk analyses to quantify risks from historical disposal units and CCRMU fills. For historical units, US EPA relied on modeling results for “previously excluded” units from the 2014 CCR Risk Assessment. For CCRMU fills, however, US EPA performed new modeling that incorporated several different assumptions relative to the 2014 Risk Assessment. In addition, US EPA evaluated potential radiation risks associated with residential exposure involving homes constructed on or near CCRMU fills. This presentation will summarize and provide perspective on the methods, key assumptions, and findings of the Legacy Rule Risk Assessments, highlighting differences from the 2014 Risk Assessment.
Document Type
Presentation
Archival?
Archival
Understanding the 2024 Legacy Rule Risk Assessments
Lexington, Kentucky
The United States Environmental Protection Agency's (US EPA's) May 2024 Legacy Coal Combustion Residuals (CCR) Rule aims to address potential releases and associated risks from legacy surface impoundments and CCR management units (CCRMUs) that were not regulated under the 2015 CCR Rule. As part of the 2024 rule, US EPA conducted several risk analyses to quantify risks from historical disposal units and CCRMU fills. For historical units, US EPA relied on modeling results for “previously excluded” units from the 2014 CCR Risk Assessment. For CCRMU fills, however, US EPA performed new modeling that incorporated several different assumptions relative to the 2014 Risk Assessment. In addition, US EPA evaluated potential radiation risks associated with residential exposure involving homes constructed on or near CCRMU fills. This presentation will summarize and provide perspective on the methods, key assumptions, and findings of the Legacy Rule Risk Assessments, highlighting differences from the 2014 Risk Assessment.
