EPA Residual Risk and Technology Review – Subpart MM RTR
The Subpart MM MACT standards limit HAP emissions from chemical recovery combustion sources (e.g., spent liquor recovery furnaces, their associated smelt dissolving tanks, and rotary kilns and calciners) at mills producing kraft, soda, sulfite, and semi-chemical pulps. As of May 2014, no timetable has been finalized for the Subpart MM RTR. The risk assessment portion of the Subpart MM RTR is expected to include the following: 1) An opportunity to submit corrections and update emissions inventory data prior to the Subpart MM residual risk modeling. Corrections submitted during the 2012 comment period for Subpart S RTR, in many cases, focused solely on emissions from Subpart S sources, given the associated time constraints. 2) More rigorous analyses on inhalation and multipathway risks associated with polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), polycyclic organic matter (POM), cadmium, mercury, lead, and other ‘persistent and bio-accumulative’ hazardous air pollutants (PB-HAP) in the combustion source emissions inventory.