The EA process chart is organized to best meet the One Federal Decision timeframe from initiation of the EA to publication of the EA or the Finding of No Significant Impact (FONSI), and applicable timeframes for authorization. The timing of the concurrence points within the NEPA process are suggested to help best meet the timeframe and prevent delays to the project schedule by ensuring agencies address key concerns early in the environmental review process.

Refer to the Section 139 Environmental Review Process: Efficient Environmental Reviews for Project Decisionmaking and One Federal Decision Interim Final Guidance for information concerning the statutory framework at 23 U.S.C. 139.