On May 8, 2024, EPA published the Legacy CCR Surface Impoundments” rule (Legacy Rule) in response to the DC Circuit decision in Utility Solid Waste Activities Group, et al. v. EPA, 901 F.3d 414, 432-33 (D.C. Cir. 2018). The final rule went into effect November 8, 2024. This rule established requirements for the safe disposal of Coal Combustion Residuals (CCR) in inactive CCR surface impoundments located at inactive facilities (i.e. legacy SIs”). It also established requirements for CCR management units” (CCRMU) to address the risks from previously unregulated solid waste management of CCR that involves the direct placement of CCR on the land at CCR facilities. This rule would extend certain deadlines for CCR management units. Specifically, EPA is proposing (1) to establish an additional option other than the existing deadline of February 9, 2026, for owners or operators of CCRMU to comply with the facility evaluation report part 1 and (2) to extend the current deadline of May 8, 2028, for owners and operators of CCRMU to comply with the groundwater monitoring requirements.