Residual Risk and Technology Review Amendments to the Secondary Aluminum Production National Emission Standards for Hazardous Air Pollutants (NESHAP)

This rule regulates Hazardous Air Pollutants (HAP) from secondary aluminum production facilities that are major sources of HAP and that operate aluminum scrap shredders, thermal chip dryers, scrap dryers/delacquering kilns/decoating kilns, group 2 furnaces, sweat furnaces, dross only furnaces, rotary dross coolers, and secondary aluminum processing units (SAPUs). SAPUs include group 1 furnaces and in-line fluxers. Area sources of HAP are regulated only with respect to emissions of dioxins/furans (D/F) from thermal chip dryers, scrap dryers/delacquering kilns/decoating kilns, sweat furnaces, and SAPUs. Section 112(f)(2) of the Clean Air Act (CAA) directs EPA to conduct risk assessments on each source category subject to maximum achievable control technology (MACT) standards and determine if additional standards are needed to reduce residual risks. The section 112(f)(2) residual risk review is to be done within 8 years after promulgation. Section 112(d)(6) of the CAA requires EPA to review and revise the MACT standards, as necessary, taking into account developments in practices, processes, and control technologies. The section 112(d)(6) technology review is to be done at least every 8 years. These risk and technology reviews for secondary aluminum production facilities will be conducted in this rulemaking, which will address possible residual risks, technology advancements, and clarifications to the existing rule.