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There are three main types of NEPA review requiring different levels of documentation and analysis: categorical exclusion, environmental assessment, and environmental impact statement.

A categorical exclusion (CE) is a class of actions that a Federal agency has determined, after review by CEQ, do not individually or cumulatively have a significant effect on the human environment and for which, therefore, neither an environmental assessment nor an environmental impact statement is normally required.

There are three main types of NEPA review requiring different levels of documentation and analysis: categorical exclusion, environmental assessment, and environmental impact statement.

Categorical exclusions (CEs) are categories of actions that have been determined not to have a significant effect on the human environment either individually or cumulatively.

10.5 Categorical Exclusions. A. Operation, Maintenance, and Replacement of Existing Facilities. Examples are normal renovation of buildings, road maintenance and limited rehabilitation of irrigation structures.

Categorical exclusions are categories of actions that DOE has determined, by regulation, normally do not have a significant effect on the human environment and for which, therefore, neither an environmental assessment nor an environmental impact statement normally is required.

Definition of a Categorical Exclusion Categorical exclusions (CEs) are categories of actions that have been determined not to have a significant effect on the human environment either individually or cumulatively.

Categorical Exclusion The C-list (23 CFR 771.118(c)) is a specific list of CEs that normally require minimal documentation. The D-list (23 CFR 771.118(d)) describes other project types that may quality as a CE if appropriately analyzed, documented, and approved by FTA.