EPA is rescinding 40 CFR part 61, subpart T (subpart T) as it applies to owners and operators of uranium mill tailings disposal sites licensed by the Nuclear Regulatory Commission (NRC) or an affected Agreement State (Agreement States). As required by section 112(d)(9) of the Clean Air Act as amended, EPA has determined that the NRC regulatory program protects public health with an ample margin of safety to the same level as would implementation of subpart T. Subpart T is a National Emission Standard for Hazardous Air Pollutants (NESHAPs) which was published on December 15, 1989 and which regulates emissions of radon-222 into the ambient air from uranium mill tailings disposal sites. Subpart T continues to apply to unlicensed uranium mill tailings disposal sites currently regulated under subpart T that are under the control of the Department of Energy (DOE).
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