Natural Resource Damage Assessment and Restoration

Natural Resource Damage Assessment and Restoration (NRDAR) is the process used to determine whether natural resources have been injured, destroyed, or lost as a result of a release of hazardous substances or oil, and to identify actions and funds needed to restore such resources. NRDAR is authorized by several state and federal environmental laws.

Contact Us

Remediation Section
391 Lukens Drive
New Castle, Delaware 19720

Federal and State Laws

At the federal level, NRDAR authority is part of the Comprehensive Environmental Response, Compensation and Liability Act of 1980 (CERCLA), Oil Pollution Act of 1990 (OPA) and the Clean Water Act (CWA).

Both CERCLA and OPA define “natural resources” broadly to include “land, fish, wildlife, biota, air, water, groundwater, drinking water supplies, and other such resources…” Both statutes limit “natural resources” to those resources held in trust for the public, termed Trust Resources.

The state of Delaware also has independent authority for NRDAR under the state’s Hazardous Substance Cleanup Act (HSCA).

These laws provide for recovery from the Potentially Responsible Parties (PRPs) of damages (money or other compensation) for injuries to natural resources and the costs of assessing those damages, if those injuries are due to releases of hazardous substances, or oil.

Natural Resource Damage Assessments (NRDAs) are investigations of injuries to natural resources that are held in the public trust. Injuries to natural resources may occur at hazardous substance sites or in connection with oil spills.

Natural Resource Trustees

Damage to natural resources is recoverable by the agencies having jurisdiction over those resources, known as “Natural Resource Trustees.”

For state resources, including fish, wildlife, wetlands, forests, groundwater, and recreational uses, the Trustee (delegated by the Governor) is the Secretary of DNREC. The Secretary has further delegated this function to staff from the Divisions of Waste and Hazardous Substances, Fish and Wildlife, and Water.

Federal Trustees generally involved in Delaware cases include the National Oceanic and Atmospheric Administration (NOAA) and the U.S. Fish and Wildlife Service (USFWS).

Conducting Assessments

NRDA Study Plans: Koppers Superfund Site

The Koppers Natural Resource Trustees are seeking public comment on study plans for a Natural Resource Damage Assessment for the Koppers Superfund Site, near Newport.

Please submit comments (by April 15, 2023) to the US Fish and Wildlife Service.

Much of the natural resource damage assessment and administrative work is conducted by case managers in the DNREC Remediation Section, which manages the Hazardous Substances Cleanup Act (HSCA) program, as well as state involvement in the Superfund program. A Deputy Attorney General handles legal issues.

Generally, the Trustees will attempt to engage in a cooperative assessment process with Potentially Responsible Parties. This approach can often result in more cost-effective assessments and a reduction in the need for “defensive” studies on both sides. The Trustees also generally promote integration of restoration with remediation to allow quicker and less costly accomplishment of both goals at once.

Once a damage assessment is completed, the Trustees select one or more projects designed to restore, rehabilitate, replace, or acquire the equivalent of the specific resources or services lost at the spill or release site. Projects are then carried out with funding from the Potentially Responsible Parties by DNREC, the Potentially Responsible Party, or a contractor.

An important factor in measuring damages and scaling restoration projects is the length of time the injuries existed before being brought to an end and then restored. When the injuries are too extensive or too long-lasting to be compensated for by a restoration at the incident site, off-site restoration projects are used.