This desk reference provides explanatory guidance for environmental impact analysis performed to comply with Council on Environmental Quality (CEQ) Regulations for Implementing the Procedural Provisions of the National Environmental Policy Act (CEQ Regulations) (40 Code of Federal Regulations (CFR) parts 1500-1508), U.S. Department of Transportation (DOT) Order 5610.1C, Procedures for Considering Environmental Impacts, and Federal Aviation Administration (FAA) Order 1050.1F Environmental Impacts: Policies and Procedures.