EPA Publishes Proposed MATS Rule Revisions in Federal Register

On April 24, 2023, EPA published proposed revisions to the MATS Rule (Subpart UUUUU, 40 CFR Part 63) in the Federal Register. Comments on the proposed rule are due on or before June 23, 2023. EPA will hold a virtual public hearing on May 9, 2023. A copy of the proposed rule is available HERE.

As an overview, EPA is proposing to (1) eliminate the surrogate non-Hg metals HAP standard for filterable PM compliance for existing coal-fired EGUs; (2) require PM CEMS to demonstrate compliance with the applicable filterable PM limit (thereby eliminating the quarterly stack testing option); (3) set a new Hg emission limit for EGUs combusting lignite; and (4) remove “Startup Definition 2.”

The EPA Administrator signed the proposed MATS Rule on April 3, 2023. You can find a link to our previous website news post HERE, which features a redline/strikeout version of the proposed rule and a summary of the proposed revisions.

We welcome any questions or concerns you may have regarding the impact of these rule changes, and we would be more than happy to connect you with a regulatory specialist to discuss further. Please don’t hesitate to reach out to our COMPAS group at compas@vimtechnologies.com if you require any assistance. Additionally, if you need help updating your DAHS (Data Acquisition and Handling System) to ensure compliance with the changes, our support group at support@vimtechnologies.com is always available and ready to help.