On December 16, 2005, the EPA promulgated the final Standards of Performance for New Stationary Sources and Emission Guidelines for Existing Sources: Other Solid Waste Incineration (OSWI) Units. The Clean Air Act (CAA) directs states with OSWI units subject to the emission guidelines to submit plans to the EPA that implement and enforce the emission guidelines. The CAA requires the EPA to develop, implement and enforce a Federal plan for OSWI units in the states with existing OSWI units that do not submit an approvable plan. This action will propose a Federal plan to implement emission guidelines for OSWI units located in states and Indian country without effective state or Tribal plans. When the EPA approves a state plan, the Federal plan will no longer apply to units in that state.