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Follow directions on this page to complete your Environmental Assessment (EA) and Environmental Impact Statement (EIS) for NEPA (National Environmental Policy Act) documentation for a state transportation project.
View this graphic for an overview of the EA or EIS process (272 kb).
Review Chapter 400: Environmental Review and Transportation Decision Making of the Environmental Manual for policies that must be considered when completing an EA or EIS.
Prepare an EA when the environmental impact of a proposed project is not clearly understood. An EA describes the extent and level of environmental impact. The document will either support a Finding of No Significance (FONSI) or indicate the need for an EIS.
Prepare an EIS for actions that are likely to have a significant impact the natural or built environment or are highly controversial. The EIS describes the extent and level of long and short-term environmental impacts, project benefits, and mitigation measures. Completion of an EIS requires an open public process proscribed by State and Federal Law.
Use these essential documents when working through either an EA or and EIS process:
NEPA Documentation Roles and Responsibilities (pdf 137 kb) table details the specific roles and responsibilities of the WSDOT project teams, discipline specialists, Environmental Services Office, Federal Highway Administration (FHWA), and the State Responsible Official through the various stages of documentation.
Preparing an EA (pdf 749 kb) procedure provides a step-by-step procedure from project assignment to issuance of a FONSI.
Preparing an EIS (pdf 739 kb) procedure provides a step-by-step procedure from project assignment to issuance of the Record of Decision (ROD). This document contains information on creating an administrative record, developing coordination plans, writing discipline reports, and conducting signature briefings.
A re-evaluation establishes whether or not a previously approved NEPA document, determination, or decision remains valid. Re-evaluation generally occurs when a project has elements not previously evaluated (e.g., design changes) or when a “shelved” project comes back to life.
This page guides project teams in the preparation of environmental impact statements and environmental assessments, but many of the tips also apply to documented categorical exclusions. This page provides resources for authors and reviewers to ensure NEPA/SEPA documents are of high quality and readable to the general public.
The following pages provide specific direction and guidance for assessing impacts on the environment by discipline.
Air quality, noise, and energy
Water resources & erosion control