Archived
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Location
Lexington, Kentucky
Start Date
6-5-2026 8:00 AM
End Date
6-5-2026 8:30 AM
Description
Gabriel J. Hebert1, Gregory B. Byer1, Margaret Gentile1 1Arcadis U.S., Inc., 2839 Paces Ferry Road SE, Suite 1000, Atlanta, GA 30339 KEYWORDS: geophysical imaging, delineation, CCRMU ABSTRACT Under the 2024 Legacy CCR Rule detailed in 40 CFR Part 257, Section 75, all electric utility companies with a known legacy coal combustion residuals (CCR) surface impoundment are required to conduct a facility evaluation to identify the location, dimensions, and volumes of CCR placed and remaining on site and to assess structural stability. At a minimum, the presence or absence of CCR management units (CCRMUs) must be documented through a desktop records survey and confirmed through a physical inspection of the facility. When necessary, physical investigation activities may be required to fill data gaps. While traditional intrusive investigation methods such as soil borings and test pits may be used to fill these gaps, geophysical methods offer a non-invasive, cost-effective approach to delineate the extent and internal structure of these landfills, providing critical data for remediation planning. This paper explores the application of geophysical techniques such as electrical resistivity imaging (ERI), seismic methods—particularly multichannel analysis of surface waves (MASW)—and electromagnetic induction (EMI) to support these evaluations. ERI is particularly effective in detecting moisture variations and saturation, while MASW provides valuable information on stiffness profiles and subsurface stratigraphy, aiding in the assessment of structural integrity. EMI complements these methods by laterally mapping conductivity anomalies associated with CCR. Integrating these geophysical datasets with geochemical and hydrogeological information enhances interpretation accuracy and supports compliance with regulatory requirements, sustainable management strategies, and environmental protection. Submitted for consideration for WOCA 2026, Lexington, KY.
Document Type
Presentation
Archival?
Archival
Included in
Energy Systems Commons, Environmental Indicators and Impact Assessment Commons, Environmental Monitoring Commons, Mining Engineering Commons, Oil, Gas, and Energy Commons, Structural Materials Commons, Sustainability Commons
Benefits of Geophysical Imaging for Coal Combustion Residuals Management Unit Delineation
Lexington, Kentucky
Gabriel J. Hebert1, Gregory B. Byer1, Margaret Gentile1 1Arcadis U.S., Inc., 2839 Paces Ferry Road SE, Suite 1000, Atlanta, GA 30339 KEYWORDS: geophysical imaging, delineation, CCRMU ABSTRACT Under the 2024 Legacy CCR Rule detailed in 40 CFR Part 257, Section 75, all electric utility companies with a known legacy coal combustion residuals (CCR) surface impoundment are required to conduct a facility evaluation to identify the location, dimensions, and volumes of CCR placed and remaining on site and to assess structural stability. At a minimum, the presence or absence of CCR management units (CCRMUs) must be documented through a desktop records survey and confirmed through a physical inspection of the facility. When necessary, physical investigation activities may be required to fill data gaps. While traditional intrusive investigation methods such as soil borings and test pits may be used to fill these gaps, geophysical methods offer a non-invasive, cost-effective approach to delineate the extent and internal structure of these landfills, providing critical data for remediation planning. This paper explores the application of geophysical techniques such as electrical resistivity imaging (ERI), seismic methods—particularly multichannel analysis of surface waves (MASW)—and electromagnetic induction (EMI) to support these evaluations. ERI is particularly effective in detecting moisture variations and saturation, while MASW provides valuable information on stiffness profiles and subsurface stratigraphy, aiding in the assessment of structural integrity. EMI complements these methods by laterally mapping conductivity anomalies associated with CCR. Integrating these geophysical datasets with geochemical and hydrogeological information enhances interpretation accuracy and supports compliance with regulatory requirements, sustainable management strategies, and environmental protection. Submitted for consideration for WOCA 2026, Lexington, KY.
