|(a) This subchapter applies to the operation of municipal solid waste storage and processing units. If separate authorizations are required to conduct storage and processing activities at a permitted landfill facility, those activities are subject to this subchapter and the commission may reconcile any conflicting site operating plan provisions between this subchapter and Subchapter D of this chapter (relating to Operational Standards for Municipal Solid Waste Landfill Facilities). (b) Permits and registrations for units that existed before the comprehensive rule revisions in this chapter as adopted in 2006 (2006 Revisions) became effective remain valid, except as provided by this subchapter. The permittee or registrant is under an obligation to apply for a modification within 180 days, unless approved otherwise by the executive director, in accordance with §305.70(k) of this title (relating to Municipal Solid Waste Permit and Registration Modifications), as applicable, to incorporate the 2006 Revisions. The application will be processed as a modification requiring public notice and any subsequent applications will be processed in accordance with Chapter 305, Subchapter D of this title (relating to Amendments, Renewals, Transfers, Corrections, Revocation, and Suspension of Permits). Timely submission of a request for a modification qualifies the owners or operators of existing units to operate under requirements contained in the existing authorization.