View Rule

This proposed action addresses the Agency's residual risk and technology review (RTR) of the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Cellulose Products Manufacturing. The Cellulose Products Manufacturing NESHAP, subpart UUUU, was promulgated pursuant to section 112(d) of the Clean Air Act (CAA) on June 11, 2002. The NESHAP established emission limitations and work practice requirements based on maximum achievable control technology (MACT) for controlling emissions of hazardous air pollutants (HAP) from viscose processes and cellulose ethers production. The HAP emitted from viscose processes include carbon disulfide, carbonyl sulfide, and toluene. The HAP emitted from cellulose ether production include ethylene oxide, methanol, methyl chloride, and propylene oxide. This action implements the residual risk review requirements of CAA section 112(f)(2) and the technology review requirements of CAA section 112(d)(6). The statute directs the EPA to promulgate emission standards under CAA section 112(f)(2) if such standards are required to provide an ample margin of safety to protect public health or to prevent, taking relevant factors into account, an adverse environmental effect. Any such standards are to be promulgated within 8 years after promulgation of MACT standards under CAA section 112(d). CAA section 112(d)(6) requires the EPA to review and revise the MACT standards as necessary, taking into account developments in practices, processes, and control technologies, no less often than every 8 years. Pursuant to a court order, the EPA is obligated to complete this action by March 13, 2020. In consideration of this deadline, which also applies to 19 other RTR source categories, we established an internal schedule for this RTR to be proposed and finalized prior to the court ordered deadline.