Rocky Flats Site, Colorado

The U.S. Department of Energy (DOE) Office of Legacy Management (LM) is conducting a Five-Year Review of the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) remedy at the Rocky Flats Site, Colorado.

The purpose of the Five-Year Review is to evaluate remedy performance to determine if it remains protective of human health and the environment. The Rocky Flats Site remedy consists of institutional and physical controls, monitoring, and maintenance. The Rocky Flats Site Five-Year Review team will conduct a remedy performance technical assessment based on monitoring data, inspection, and surveillance reports; changes in risk assessment parameters; and other relevant information. Results of the Five-Year Review will be documented in a report to be completed by August 2027 and posted to the Rocky Flats Site webpage. 

Members of the public may provide input on the Five-Year Review by sending comments to: 
Rocky Flats Site Five-Year Review Comments,11035 Dover Street, Suite 600, Westminster, CO 80021 or by email to rfinfo@lm.doe.gov. 

Public input must be received in writing no later than July 30, 2026, to be considered for the report. To adhere to the review schedule, written input received after this date will not be incorporated. 

The previous Five-Year Review Report, completed in 2022, is available at https://lmpublicsearch.lm.doe.gov/lmsites/s35622_rfs_5th_fyr_signed_wepa%20letter.pdf. 

For more information about the Rocky Flats Site, visit https://www.energy.gov/lm/rocky-flats-site-colorado or contact:  

Michelle Franke, LM Rocky Flats Site Manager  
(303) 746-5409 
michelle.franke@lm.doe.gov  

Padraic Benson, LM Program Analyst 
(303) 404-4821
padraic.benson@lm.doe.gov 

Information on the CERCLA Five-Year Review process and guidance for conducting Five-Year Reviews is available at: Writing Five-Year Reviews at Superfund Sites | US EPA.