PUBLIC NOTICE WASHINGTON DULLES INTERNATIONAL AIRPORT Transwestern northgate development FINAL ENVIRONMENTAL ASSESSMENT AVAILABLE FOR REVIEW AND COMMENT AVAILABILITY OF FINAL ENVIRONMENTAL ASSESSMENT AND FINDING OF NO SIGNIFICANT IMPACT/RECORD OF DECISION Notice of Impacts to Wetlands in Accordance with Section 2(b) of E.O. 11990, Protection of Wetlands This notice is intended to advise the public that on September 11, 2026, the Federal Aviation Administration (FAA) issued a Finding of No Significant Impact (FONSI) for the federal actions reviewed in the Final Environmental Assessment (EA) for the Transwestern Northgate Development at Washington Dulles International Airport (IAD or the Airport). The Proposed Action includes lease of an approximately 53-acre parcel northeast of IAD for development as a warehouse facility. The purpose of the Proposed Action is to develop sufficient warehouse space to meet the demand for logistics and distribution facilities in the IAD area. The Proposed Action is needed to support the essential flow of goods to the local population. The Federal Aviation Administration (FAA) is the lead federal agency to ensure compliance with the National Environmental Policy Act of 1969 (NEPA) for airport development actions. The Final EA has been prepared pursuant to the requirements of Federal Aviation Administration (FAA) Order 1050.1G, FAA National Environmental Policy Act Implementing Procedures and Department of Transportation’s (DOT) Order 5610.1D, DOT’s Procedures for Considering Environmental Impacts. The FONSI indicates that the project is consistent with NEPA policies and objectives in that it will not significantly affect the quality of the human environment. The Proposed Action includes potential impacts to 970 linear feet of streams and 0.26 acres of wetlands. It is anticipated that the project will qualify for a State Programmatic General Permit and Virginia Water Protection Permit based on further consultation with the United States Army Corps of Engineers and the Virginia Department of Environmental Quality which will include compensatory mitigation for project impacts. The Final EA can be accessed on the Airports Authority’s website under the Environmental Information section: https://www.mwaa.com/about/environmental-information. A physical copy of the Final Programmatic EA is available at the Brambleton Branch of the Loudoun County Library: Loudoun County Library, Brambleton Branch 22850 Brambleton Plaza Brambleton, Virginia 20148 Please direct any comments or questions on the Final EA or FONSI to: Rachel Morgan, Planning Department Metropolitan Washington Airports Authority 1 Aviation Circle Washington, D.C. 22202 [email protected] IAD Transwestern Northgate Final EA 091026 (Signed)_2.pdf Appendix A - Figures_2.pdf Appendix B - Loudoun County Policy Area Map_2.pdf Appendix C - Project Site Plans UPDATED 31July_2.pdf Appendix D - Unaffected Resources_2.pdf Appendix E - Northgate_Final Air Quality Analysis_July 2026_2.pdf Appendix F - Endangered and Threatened Species Databases_2.pdf Appendix G - Agency Correspondence_2.pdf Appendix H - Hazardous Materials Information_2.pdf Appendix I - Land Use_2.pdf Appendix J - US Census Bureau Census Tracts_2.pdf Appendix K - Waters of the United States_3.pdf Appendix L - FEMA FIRM_1.pdf Appendix M - State Scenic Rivers and EPA Map of Sole Source Aquifer Locations_1.pdf Appendix N - Public Involvement_revised_1.pdf IAD Transwestern Northgate FONSI (Final Signed).pdf Hide related content Off Editorial Section(s) Environmental Information