Archived
This content is available here strictly for research, reference, and/or recordkeeping and as such it may not be fully accessible. If you work or study at University of Kentucky and would like to request an accessible version, please use the SensusAccess Document Converter.
Location
Lexington, Kentucky
Start Date
5-5-2026 2:30 PM
End Date
5-5-2026 3:00 PM
Description
Arsenic has been a key risk factor in the evaluations for the 2015 Coal Combustion Residuals (CCR) Rule and the recent “Legacy Rule”, which addresses areas of historical CCP placement not covered by the 2015 rule. These risk assessments concluded that cancer risks from arsenic in various waste management scenarios exceeded the U.S. Environmental Protection Agency's (USEPA) target of 1 in 100,000 excess lifetime cancer cases, forming part of the basis for national CCP regulations. However, background exposure to naturally occurring arsenic in food, water, and soil also exceeds permissible levels, complicating risk conclusions. The USEPA's recent revision of arsenic risk assessment values under its Integrated Risk Information System (IRIS) program has increased the cancer potency of arsenic, which could result in further risk exceedances. This could impact future evaluations of CCPs and may also influence non-cancer risk assessments. This presentation highlights the key elements of arsenic risk assessment and its implications for CCP evaluations.
Document Type
Presentation
Archival?
Archival
Providing Perspective on Arsenic Risks in the Human Health Risk Evaluation of Coal Combustion Products (CCPs)
Lexington, Kentucky
Arsenic has been a key risk factor in the evaluations for the 2015 Coal Combustion Residuals (CCR) Rule and the recent “Legacy Rule”, which addresses areas of historical CCP placement not covered by the 2015 rule. These risk assessments concluded that cancer risks from arsenic in various waste management scenarios exceeded the U.S. Environmental Protection Agency's (USEPA) target of 1 in 100,000 excess lifetime cancer cases, forming part of the basis for national CCP regulations. However, background exposure to naturally occurring arsenic in food, water, and soil also exceeds permissible levels, complicating risk conclusions. The USEPA's recent revision of arsenic risk assessment values under its Integrated Risk Information System (IRIS) program has increased the cancer potency of arsenic, which could result in further risk exceedances. This could impact future evaluations of CCPs and may also influence non-cancer risk assessments. This presentation highlights the key elements of arsenic risk assessment and its implications for CCP evaluations.
