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This action will address the agency’s residual risk and technology review (RTR) of the Standards of Performance for New Stationary Sources and Emission Guidelines for Existing Sources for Large Municipal Waste Combustors.The New Source Performance Standards (NSPS), subpart Eb, and the Emission Guidelines, subpart Cb, were promulgated pursuant to section 129 of the Clean Air Act (CAA) on May 10, 2006. The NSPS and emission guidelines established emission limitations based on maximum achievable control technology for controlling emissions of hazardous air pollutants and criteria pollutants from large municipal waste combustors. The regulated pollutants, as required under CAA section 129(a)(4), are particulate matter, sulfur dioxide, hydrogen chloride, oxides of nitrogen, carbon monoxide, lead, cadmium, mercury, and dioxins/furans.This action will implement the residual risk review requirements of CAA section 129(h)(3) and the technology review requirements of CAA section 129(a)(5). The statute directs the EPA to promulgate emission standards under CAA 112(f) for a category of solid waste incineration units if such standards are required under CAA section 112(f). Any such standards are to be promulgated within 8 years after promulgation of the original standards under CAA section 129. CAA section 129(h)(3) also specifies that only the pollutants listed under CAA section 129(a)(4) shall be considered and regulated, if required, under the residual risk review. CAA section 129(a)(5) requires the EPA to review and revise the standards and other requirements as necessary, no less often than every 5 years.