Environmental Protection Agency February 24, 2020 – Federal Register Recent Federal Regulation Documents

The Environmental Protection Agency (EPA) is reproposing to approve under the Clean Air Act an element of the State Implementation Plan (SIP) revision for attaining the 1-hour sulfur dioxide (SO2) primary national ambient air quality standard (NAAQS) for the Southwest Indiana nonattainment area (including parts of Daviess and Pike Counties), based on revised limits for the Indianapolis Power and Light's Petersburg facility (IP&L-Petersburg) that Indiana submitted on September 18, 2019. Indiana's revised limits are based on the same dispersion modeling and the same 1-hour average emission rates that EPA proposed to conclude would result in attainment. However, the revised limits reflect revised calculations of the degree of adjustment needed for the 30-day average limits to be comparably stringent to 1-hour limits at the modeled emission rates. EPA is soliciting additional comments that may arise from these revisions.

The Environmental Protection Agency (EPA) is acting on multiple elements of State Implementation Plan (SIP) revisions from the State of Wyoming to demonstrate that the State meets infrastructure requirements of Clean Air Act (CAA) section 110(a) for the 2015 ozone National Ambient Air Quality Standard (NAAQS). Section 110(a) of the CAA requires that each state submit a SIP for the implementation, maintenance and enforcement of each NAAQS promulgated by the EPA.

EPA is proposing significant new use rules (SNURs) under the Toxic Substances Control Act (TSCA) for chemical substances which are the subject of premanufacture notices (PMNs). This action would require persons to notify EPA at least 90 days before commencing manufacture (defined by statute to include import) or processing of any of these chemical substances for an activity that is designated as a significant new use by this proposed rule. This action would further require that persons not commence manufacture or processing for the significant new use until they have submitted a Significant New Use Notice, and EPA has conducted a review of the notice, made an appropriate determination on the notice under TSCA 5(a)(3), and has taken any risk management actions as are required as a result of that determination.

The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision submitted by the District of Columbia. This revision satisfies the nitrogen oxides (NOX) reasonably available control technology (RACT) requirements under the 2008 8-hour ozone national ambient air quality standard (2008 ozone NAAQS). The District of Columbia's NOX RACT submittal for the 2008 ozone NAAQS: Amends existing regulatory provisions to add new or more stringent regulations or controls that represent RACT control levels for combustion turbines and associated heat recovery steam generators and duct burners, amends the applicability provisions of these regulations to include all combustion turbines and associated heat recovery steam generators and duct burners, and adds conforming definitions; includes a source specific NOX RACT determination for four specific emissions units at one major stationary source of NOX; includes a certification that, for other categories of sources, controls already approved by EPA into the District of Columbia's SIP to meet NOX RACT for previous ozone NAAQS are based on technically and economically feasible controls and continue to represent NOX RACT for 2008 8-hour ozone NAAQS implementation purposes; and in an effort to clean-up its SIP, removes carbon monoxide (CO) emissions limits for combustion turbines that no longer exist in the District of Columbia. This action is being taken under the Clean Air Act (CAA).