; or (II) if the owner or operator provides the written description under subclause (I), the owner or operator fails to remove the barrier or to make substantial progress in removing the barrier during the period beginning on the date the description is provided and ending 120 days after that date. (C) Specification of details of alleged violation The written notice required under subparagraph (B) must also specify in detail the circumstances under which an individual was actually denied access to a public accommodation, including the address of property, the specific sections of the Americans with Disabilities Act alleged to have been violated, whether a request for assistance in removing an architectural barrier to access was made, and whether the barrier to access was a permanent or temporary barrier. . 4. Effective date This Act and the amendments made by this Act take effect 30 days after the date of the enactment of this Act. 5. Mediation for ada actions related to architectural barriers The Judicial Conference of the United States shall, under rule 16 of the Federal Rules of Civil Procedure or any other applicable law, in consultation with property owners and representatives of the disability rights community, develop a model program to promote the use of alternative dispute resolution mechanisms, including a stay of discovery during mediation, to resolve claims of architectural barriers to access for public accommodations. To the extent practical, the Federal Judicial Center should provide a public comment period on any such proposal. The goal of the model program shall be to promote access quickly and efficiently without the need for costly litigation. The model program should include an expedited method for determining the relevant facts related to such barriers to access and steps taken before the commencement of litigation to resolve any issues related to access.