The Department of Natural Resources and Environmental Control (DNREC) Remediation Section (RS) has adopted a plan regarding the clean-up of the Operable Unit 1 (OU-1) of the Riverwalk Phase I (DE-1731) Site (Site) located to the west of South Market Street adjacent to the Christina River in Wilmington, Delaware. The approximately 1.36-acre OU-1 Site of the Riverwalk Phase I is part of Area 1 of the 86-acre proposed South Market Street Redevelopment Project (also referred to as the Riverfront East) located along the Christina River in downtown Wilmington. Historically, portions of OU-1 were operated by multiple commercial and industrial businesses since the early 1900s, including: a tannery, bulk petroleum product terminal, filling stations, salvage yards, used pipe distributor, and other light manufacturers and wholesale distributors.

OU-1 will be subject to the following key remedial actions: the submittal of a Remedial Action Work Plan which specifies the methods to be used to remediate the site including the removal and disposal of the polychlorinated biphenyl (PCB)-impacted soil and arsenic-impacted soils to meet DNREC Hazardous Substance Cleanup Act (HSCA) and applicable Federal standards, implementation of a cap, development and compliance with the Contaminated Materials Management Plan (CMMP) and a Long-Term Stewardship (LTS) Plan, the recording of an Environmental Covenant restricting use to commercial, manufacturing, or industrial; limiting interference with remedy; limiting groundwater withdrawal; and compliance with the CMMP and LTS Plan; and the submittal of a Remedial Action Completion Report.

DNREC issued a public notice of the Proposed Plan of Remedial Action (Proposed Plan) for the OU-1 of the Riverwalk Phase I Site on May 6, 2026. There were no comments or questions from the public regarding the Proposed Plan.

Details of the Final Plan of Remedial Action (Final Plan) are available online at den.dnrec.delaware.gov.

For additional information, please contact:

Morgan McGee-Solomon and Gina Marinacci, Project Managers
DNREC Division of Waste and Hazardous Substances
Remediation Section
391 Lukens Drive, New Castle, DE 19720
DNREC_WHS_REMEDIATIONINBOX@delaware.gov
302-395-2600

Related Topics:  clean-up, final plan, public notice, remediation, waste and hazardous substances