PUBLIC NOTICE WASHINGTON DULLES INTERNATIONAL AIRPORT Transwestern northgate development DRAFT ENVIRONMENTAL ASSESSMENT AVAILABLE FOR REVIEW AND COMMENT Notice of Impacts to Wetlands in Accordance with Section 2(b) of E.O. 11990, Protection of Wetlands The Metropolitan Washington Airports Authority (Airports Authority) has prepared a Draft Environmental Assessment (EA) to evaluate 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 Draft EA has been prepared pursuant to the requirements of 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. This Notice also serves to notify the public that this EA process will satisfy the public notice and comment requirements of Executive Order 11990, Protection of Wetlands. 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. This public review and comment period is also being conducted pursuant to the 1987 Programmatic Memorandum of Agreement among the FAA, the Virginia State Historic Preservation Officer (VASHPO) and the Advisory Council on Historic Preservation (as regards Section 106 of the National Historic Preservation Act of 1966 – 36 CFR 800) and Section 4(f) of the DOT Act of 1966. Beginning August 7, 2026, the Draft EA will be available for public review under the Environmental Information section of the Airports Authority website: https://www.mwaa.com/about/environmental-information. A physical copy of the Draft EA is available at the Brambleton Branch of the Loudoun County Library: Loudoun County Library, Brambleton Branch 22850 Brambleton Plaza Brambleton, Virginia 20148 Written comments on the information disclosed in the Draft EA may be submitted by email (preferred) or mailed to: Rachel Morgan, Planning Department Metropolitan Washington Airports Authority 1 Aviation Circle Washington, D.C. 22202 [email protected] All comments must be received no later than 5:00 PM, August 21, 2026. Please ensure adequate time for mailing. Comments can only be accepted with the full name and address of the individual commenting. Before including your address, phone number, email address, or other personal identifying information in your comment, be advised that your entire comment – including your personal identifying information – may be made publicly available at any time. While you can ask in your comment to withhold from public review your personal identifying information, it cannot be guaranteed that it will be withheld. Comments received on the Draft EA and responses to those comments will be disclosed in the Final EA. IAD Northgate Draft EA_080626.pdf Appendix A - Figures.pdf Appendix B - Loudoun County Policy Area Map.pdf Appendix C - Project Site Plans UPDATED 31July.pdf Appendix D - Unaffected Resources.pdf Appendix E - Northgate_Final Air Quality Analysis_July 2026.pdf Appendix F - Endangered and Threatened Species Databases.pdf Appendix G - Agency Correspondence.pdf Appendix H - Hazardous Materials Information.pdf Appendix I - Land Use.pdf Appendix J - US Census Bureau Census Tracts.pdf Appendix K - Waters of the United States.pdf Appendix L - FEMA FIRM.pdf Appendix M - State Scenic Rivers and EPA Map of Sole Source Aquifer Locations.pdf Appendix N - Public Involvement.pdf Hide related content Off Editorial Section(s) Environmental Information