Final Plan of Remedial Action for 429 South Governors Avenue Site (DE-1792)

Division of Waste and Hazardous Substances

Published: July 24, 2022

The Department has adopted a plan regarding the clean-up of the 429 S. Governors Avenue Site located in Dover. The Site is currently vacant but in the past was used as dentist office.

The Site requires Environmental Management During Construction- Develop and implement a Contamination Material Management Plan (CMMP); Vapor Mitigation System; Institutional Controls- placement of an environmental covenant limiting groundwater withdrawal and compliance with the CMMP and Long-Term Stewardship (LTS) Plan; LTS Plan to monitor air to ensure that vapor migration system is effective and Remedial Action Completion Report.

DNREC issued a public notice of the Proposed Plan for the 429 S. Governors Avenue Site on June 26, 2022. There were no comments or questions from the public regarding the Proposed Plan.

Details of the Final Plan are available online at:

For additional information, please contact Rick Galloway, Project Manager at (302) 395-2600 or via email at