The Diamond State Port Corporation (DSPC) has submitted a Class III Permit Modification Application to the Delaware Department of Natural Resources and Environmental Control (DNREC) for the Port of Wilmington Edgemoor facility, located at 4600 Hay Road in Wilmington, Delaware.

DSPC will host a public meeting on the proposal on Monday, Nov. 16, 2026, at the Brandywine Fire Hall, in Wilmington. DNREC will accept public comments on the proposed permit modification through Dec. 28, 2026.

For more information, please contact Katie Faulkner, Project Manager, at RS_Public_Comments@delaware.gov or 302-739-9403

2026 Class III Permit Modification

The proposed modification would update the facility’s existing Resource Conservation and Recovery Act (RCRA) Permit (HW31B04), which governs site-wide corrective action and post-closure care.

Specifically, the modification would update the Post-Closure Care Plan for four former surface impoundments (Solid Waste Management Units 6A, 6B, 6C and 6D) to address the remedial activities proposed for Phase 1 of the project.

The Phase 1 activities include asphalt capping as part of the presumptive remedy selected by DNREC in its 2021 Final Decision and Response to Comments.

Public Meeting and Comment Period

DSPC will host a public meeting to provide information about the proposed Class III Permit Modification and answer questions from community members.

Public Meeting Details

• Date: Monday, November 16, 2026 
• Time: 6:00 pm 
• Location: Brandywine Fire Hall, 1006 Brandywine Blvd., Wilmington, DE 19809 

How to Submit Public Comments

Members of the public may submit formal written comments regarding the proposed permit modification to DNREC at: RS_Public_Comments@delaware.gov

The public comment period will close at 4:30 pm on Monday, Dec. 28, 2026.

2026 Permit Modification Documents

The following documents are associated with the proposed Class III Permit Modification and Phase 1 remedial activities.

• Public Notice of Class III Permit Modification
• Class III Permit Modification Application
  • Appendix A: Proposed Post-Closure Care Plan
• Phase 1 Design Report
• Corrective Measures Implementation Work Plan
• Excavated Materials Handling and Contingency Plan

Previous Permits and Public Hearings

Historical permitting documents and public hearing materials are available for review.

• Diamond State Corporation – 2020 Public Hearing Exhibits  
• 2020 Port of Wilmington – Edgemoor Proposal

Related Topics:  dspc, permitting and regulation, remediation, waste and hazardous