SEIS Process

A Supplemental Environmental Impact Statement, or SEIS, reviews the findings of an existing Environmental Impact Statement, or EIS. An EIS is required for projects with major impacts on the natural and human environment by the National Environmental Policy Act of 1969 (NEPA).

An SEIS allows agencies and the public to consider the impacts of significant changes and/or planned improvements to a project for which the NEPA process had previously been completed.

 Graphic of SEIS Process with Five Steps
Step 1: NOI Posted to Federal Register. Step 2: Develop Draft SEIS. Step Three: Public Review of Draft SEIS (The I-94 project is currently between Steps 2 and 3). Step 4: Develop Final SEIS. Step 5: File a Record of Decision.

  • Notice of Intent
    The NOI published on July 7, 2017 regarding the I-94 project indicated that an SEIS was necessary because changes to the project have been proposed that may result in impacts not evaluated in the 2004 Final EIS.
  • Draft SEIS
    A Draft SEIS is prepared which focuses on the proposed changes. Once prepared, a Notice of Availability is widely published. The Draft SEIS is circulated and a public hearing is held to gather public and agency comments.
  • Final SEIS
    After circulation of the Draft SEIS and consideration of comments received, a Final SEIS is prepared. This document summarizes public and agency involvement and describes mitigation measures that will be incorporated into the project. The Final SEIS also documents compliance with all other applicable environmental laws and executive orders.
  • Record of Decision
    The ROD is the final step in the environmental review process. It presents the basis for the decision, summarizes mitigation measures to be incorporated into the project, and allows further approvals to be made including securing project funding for construction.