National Emission Standards for Hazardous Air Pollutants for Industrial Process Cooling Towers

概要

On September 8, 1994, we promulgated national emission standards for hazardous air pollutants (NESHAP) from industrial process cooling towers (59 FR 46350). The NESHAP eliminated the use of chromium-based water treatment chemicals that are known or suspected to cause cancer or have a serious health or environmental effect. Section 112(f)(2) of the Clean Air Act (CAA) directs EPA to assess the risk remaining (residual risk) after the application of the NESHAP and promulgate additional standards if warranted to provide an ample margin of safety to protect public health or prevent an adverse environmental effect. Also, section 112(d)(6) of the CAA requires EPA to review and revise the NESHAP as necessary at least every 8 years, taking into account developments in practices, processes, and control technologies. Based on our findings from the residual risk review and technology review, we are proposing no further action at this time to revise the NESHAP. This proposed action requests public comments on the residual risk review and technology review for the NESHAP.