PUBLIC NOTICE
N.C. DEPARTMENT OF ENVIRONMENTAL QUALITY REQUEST FOR PUBLIC COMMENT ON ADDENDUM TO COAL COMBUSTION RESIDUALS SURFACE IMPOUNDMENT CLOSURE PLAN FOR DUKE ENERGY CAROLINAS’ MARSHALL STEAM STATION IN CATAWBA COUNTY
CLOSURE PLAN SUMMARY
On September 23, 2025, Duke Energy Carolinas, LLC submitted an addendum to coal combustion residuals (CCR) impoundment closure plan, dated September 16, 2025. The original closure plan document dated December 18, 2019, describes the excavation and removal of an estimated 16.8 million tons (14 million cubic yards) of coal ash from the Active Ash Basin.
The 2025 addendum documents and incorporates updates that have occurred in the Closure Plan since 2019. While the overall closure approach, schedule, and cost remain unchanged, the Addendum includes technical updates—such as a minor expansion of the Industrial Landfill No. 1 (ILF) footprint, the addition of a new leachate basin, adjustments to landfill phasing, removal of a previously proposed conceptual expansion, and the planned relocation of a temporary stormwater pond. The Addendum also includes revised drawings and updated stormwater calculations. The Industrial Landfill No. 1 (ILF), permitted as 1812-INDUS-2008, will receive all excavated material and is being developed in five phases. Phases 1 and 2 are currently operational, Phases 3 and 4 are under construction, and Phase 5 is in the planning stage.
CCR excavation is anticipated to be completed in the fourth quarter of 2034, with final landfill closure expected in the fourth quarter of 2035. The Addendum to the Closure Plan is currently under review by Department staff.
A copy of the Addendum to the Marshall Steam Station Closure Plan may be reviewed online at: Marshall Steam Station Coal Ash Closure Plan | NC DEQ
PUBLIC COMMENTS
The public is encouraged to provide feedback on the modified closure plan. All comments received by December 22, 2025, will be considered in determining whether the modified plan will be approved by the state. Written comments may be submitted to: Louise Hughes, N.C. Department of Environmental Quality, Attn: Louise Hughes, 1601 Mail Service Center, Raleigh, N.C., 27699-1601. Public comments may also be submitted by email to: marshallcomments@deq.nc.gov.