EPA is required to review standards issued under Section 112 and to revise them "as necessary (taking into account developments in practices, processes and control technologies)" no less frequently than every 8 years. EPA also must evaluate the MACT standards within 8 years after promulgation and promulgate standards under CAA section 112 (f)(2) if required to provide an ample margin of safety to protect public health or prevent an adverse environmental effect. The source category potentially will be assessed for inhalation risks, including cancer risk and incidence, population cancer risk, and non-cancer effects (chronic and acute). EPA also plans to potentially evaluate multipathway risk associated with the source categories with significant levels of persistent and bioaccumulative HAP. The agency will follow the Benzene Policy to identify the source category as low risk, acceptable risk, or unacceptable risk. EPA will then evaluate the effectiveness and cost of additional risk reduction options and make acceptability and ample-margin-of-safety determinations. If the need for additional controls is identified, the standards will include technology, work practice, and/or performance standards as amendments to the existing MACT standards.
Work on the review began in April 2012. EPA anticipates publishing a Notice of Proposed Rule Making (NPRM) in th Federal Register in November 2012.
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