If emergency circumstances make it necessary to take an action that has a significant environmental impact without observing the provisions of subparts A through C of this part that are required by the CEQ Regulations, the Responsible Official must consult with the NEPA Official at the earliest possible time. Consistent with 40 CFR 1506.11 , the Responsible Official and the NEPA Official should consult with CEQ about alternative arrangements at the earliest opportunity. Actions taken without observing the provisions of subparts A through C of this part will be limited to actions necessary to control the immediate impacts of the emergency; other actions remain subject to the environmental review process.
40 C.F.R. § 6.210