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Statement of Need: This action addresses EPA's statutory obligations to perform Risk and Technology Reviews (RTR) and NSPS reviews for chemical sector MACT. It will address Clean Air Act (CAA) section 112(f)(2) to conduct residual risk reviews, section 112(d)(6) to conduct technology reviews, and section 111(b)(1)(B) to conduct NSPS reviews for multiple chemical sector source categories. Under the "technology review" provision of CAA section 112, EPA is required to review maximum achievable control technology (MACT) standards and to revise them "as necessary (taking into account developments in practices, processes, and control technologies)" no less frequently than every 8 years. Under the "residual risk" provision of CAA section 112, EPA must evaluate the MACT standards within 8 years after promulgation and promulgate standards if required to provide an ample margin of safety to protect public health or prevent an adverse environmental effect. Under the CAA section 111, EPA must evaluate NSPS requirements and, if appropriate, revise existing NSPS every 8 years.

Summary of the Legal Basis: CAA sections 111 and 112

Alternatives: Unavailable.

Anticipated Costs and Benefits: We are currently estimating the costs and benefits associated with this action.

Risks: We are currently assessing the risks associated with this action.