Public Notice – Environmental Permit

PURPOSE OF NOTICE: To seek public comment on a draft permit from the Department of Environmental Quality (DEQ) to limit air pollution emitted by a facility in Ashburn, Virginia.

PUBLIC COMMENT PERIOD: August 28, 2026 to September 28, 2026

PERMIT NAME: Federal Operating Permit issued by DEQ, pursuant to applicable air laws and regulations

APPLICANT NAME AND ADDRESS: Digital Realty – Ashburn Campus 44520 Hastings Dr. Ashburn, VA 20147

FACILITY NAME, ADDRESS AND REGISTRATION NUMBER: Digital Realty – Ashburn Campus; 44480, 44520, 44521, and 44393 Hastings Dr; 44461, and 44490 Chilum Pl; and 21744 and 21745 Sir Timothy Dr, Ashburn, VA 20147, NRO-73370

PROJECT DESCRIPTION: Digital Realty – Ashburn Campus has applied for a new permit for Digital Realty – Ashburn Campus. The facility is located along Hastings Dr, Chilum Pl, and Sir Timothy Dr in Ashburn, Loudoun County. The facility is classified as a major source of air pollution. There is no proposed change in emissions. The permit would allow the source to operate facilities providing computing infrastructure, data processing, web hosting and related services (data centers).

HOW TO COMMENT AND/OR REQUEST A PUBLIC HEARING: DEQ accepts comments and requests for public hearing by hand-delivery, e-mail, or postal mail. All comments and requests must be in writing and be received by DEQ during the comment period. Submittals must include the names and mailing addresses or email addresses of the commenter/requester and of all persons represented by the commenter/requester. A request for public hearing must also include: 1) The reason why a public hearing is requested. 2) A brief, informal statement regarding the nature and extent of the interest of the requester or of those represented by the requester, including how and to what extent such interest would be directly and adversely affected by the permit. 3) Specific references, where possible, to terms and conditions of the permit, with suggested revisions. Please note this draft permit is being concurrently reviewed as a proposed permit by the U.S. Environmental Protection Agency. A public hearing may be held, including another comment period, if public response is significant, based on individual requests for a public hearing, and there are substantial, disputed issues relevant to the permit.

Contact for public comments, document requests and additional information: Jennifer M. Fore; Central Office, 1111 East Main Street, Richmond, VA 23218; Phone: (804) 494-9638; E-mail: Jennifer.Fore@deq.virginia.gov. The public may review the draft permit and application at the Northern Regional Office, 13901 Crown Ct, Woodbridge, VA 22193 or may request copies of the documents from the contact person listed above.

Run Date: August 28th, 2026

AD#104869