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Managing CCRs

This ash basin at the Meramec Energy Center closed in the spring of 2018.

The Coal Combustion Residual (CCR) Rule contains technical standards for the design, operation and closure of landfills and basins located at coal-fired energy centers. Through this rule, EPA regulates CCR as solid waste under the Resource Conservation and Recovery Act (RCRA). RCRA requires that CCR facilities operate in a manner that presents "no reasonable probability of adverse effect on health or the environment." In 2016, Congress passed legislation that authorized states to develop CCR programs and adopt, as appropriate, site specific criteria. In 2018 and in recognition of this congressional action, the Missouri General Assembly passed legislation authorizing the Missouri Department of Natural Resources (MDNR) to develop and submit a state CCR program to EPA for approval.

Also in 2018, EPA proposed revisions to the CCR Rule (Phase-One Rules) to address, in part, Congress's changes to RCRA and allow state directors to use risk-based processes similar to other existing solid waste program. Both the State of Missouri and Ameren filed public comments that support EPA's proposed changes. Copies of those comments can be accessed here.

EPA finalized the first phase of these CCR-related changes in July 2018, and the final phases are expected by summer 2019. Until a state CCR program is finalized and approved by EPA, MDNR can utilize its state-level cleanup program to approve closure and corrective measures at Ameren's ash basins.

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