Montana Administrative Rule Revisions: 17.8.334

The EPA is proposing to fully approve a revision to Montana's State Implementation Plan (SIP). On July 6, 2016, the Governor of Montana submitted to the EPA a revision to the Montana SIP that removed one section of the Administrative Rules of Montana (ARM) pertaining to aluminum plants. In this action, the EPA is proposing to approve the removal of this section from the SIP because the provision is inconsistent with Clean Air Act (CAA) requirements, as explained in the EPA's June 12, 2015 startup, shutdown, and malfunction (SSM) SIP call for Montana. Removal of this provision will correct certain deficiencies related to the treatment of excess emissions from aluminum plants.