Amended Final Plan of Remedial Action for 427 WEST 7th Street (DE-1574)

Division of Waste and Hazardous Substances

Published: Dec. 4, 2022

The Department has adopted an amended plan regarding the clean-up of the 427 West 7th Street Site located in New Castle. The Site was an automotive sales and repair facility operated on the Site since the early-1990s.

The Site will be subject to the following key remedial actions: the submittal of a Remedial Action Work Plan (RAWP) which specifies the methods to be used to remediate the Site including: the delineation, excavation, removal and disposal of primarily polycyclic aromatic hydrocarbon (PAH)-impacted soils to meet DNREC Hazardous Substance Cleanup Act (HSCA) standards; design and implementation of a physical barrier restricting human access to the on-site wetland area; sampling and analysis plan for reevaluating the soil gas after significant site condition changes; and sampling and analysis the surface water at low tide. Additional remedial actions required for the Site include: the development and compliance with the Contaminated Materials Management Plan (CMMP) and Long-Term Stewardship (LTS) Plan; the recording of an Environmental Covenant restricting groundwater withdrawal and compliance with the CMMP and LTS; and the submittal of a Remedial Action Completion Report (RACR).

DNREC issued a public notice of the Amended Proposed Plan for the 427 West 7th Street Site on November 2, 2022. There were no comments or questions from the public regarding the Amended Proposed Plan. Details of the Amended Final Plan are available online at:

For additional information, please contact Morgan McGee-Solomon, Project Manager at (302) 395-2600 or via email at