Tennessee Early Intervention Services

Tennessee Early Intervention System

Tiered Environmental Impact Statement. A series of reports developed as part of National Environmental Policy Act (NEPA) requirements, which detail the impacts of a proposed action (i.e., project) on the natural and built environment. Tier 1 – A National Environmental Policy Act (NEPA) corridor-level analysis that may be completed for large studies that require certain broad questions to be answered before a more detailed study (a Tier 2 analysis) can be done. Tier 2 – A National Environmental Policy Act (NEPA) project-level analysis focusing on specific sections of independent utility within the project's selected corridor.