EPA is issuing regulations applicable only to members of EPA's National Environmental Performance Track Program (Performance Track, or the Program). Today's action includes a revision to the Resource Conservation and Recovery Act (RCRA) regulations to allow hazardous waste generators who are members of Performance Track up to 180 days, and in certain cases 270 days, to accumulate their hazardous waste without a RCRA permit or interim status; and simplified reporting requirements for facilities that are members of Performance Track and governed by Maximum Available Control Technology (MACT) provisions of the Clean Air Act (CAA). Today's final rule reflects EPA's response to comments filed by the public, interested stakeholders and associations, the Performance Track Participants Association, and Performance Track members. These provisions are intended to serve as incentives for facility membership in the National Environmental Performance Track Program while ensuring the current level of environmental protection provided by the relevant RCRA and MACT provisions.