(b) When an Agency Official proposes an emergency undertaking as an essential and immediate response to a disaster declared by the President or the appropriate Governor, and Section 800.12(a) does not apply, the Agency Official may satisfy section 106 by notifying the Council and the appropriate State Historic Preservation Officer of the emergency undertaking and affording them an opportunity to comment within seven days if the Agency Official considers that circumstances permit.

(c) For the purposes of activities assisted under title I of the Housing and Community Development Act of 1974, as amended, Section 800.12(b) also applies to an imminent threat to public health or safety as a result of natural disaster or emergency declared by a local government's chief executive officer or legislative body, provided that if the Council or the State Historic Preservation Officer objects, the Agency Official shall comply with Sections 800.4 through 800.6.