Superfund Site Profile

The draft final 2015 Five-Year Review Report for the site is now available for public comment. All comments received by August 24, 2016 will be reviewed and considered in the final report as part of the RMA site record.

The full report is available on the Rocky Mountain Arsenal website at Community members may also review the document at the following locations:

  • Joint Administrative Records and Document Facility: Rocky Mountain Arsenal, 6550 Gateway Road, Building 129, Commerce City, CO 80022 (please call (303) 289-0300 to schedule an appointment.)
  • Anythink Commerce City Library, 7185 Monaco St., Commerce City, CO 80022
  • Denver Public Library, Montbello Branch, 12955 Albrook Dr, Denver, CO 80239

The U.S. Army welcomes questions and comments from the community. Please direct your comments and questions to: Patty Lee, Rocky Mountain Arsenal, 6550 Gateway Road, Building 129, Commerce City, CO 80222. You may also submit your comments by email to or by calling (303) 289-0300.


The Rocky Mountain Arsenal (RMA) is nearly 27 square miles, roughly the size of Manhattan. RMA is located at the western edge of the Colorado plains, near the foothills of the Rocky Mountains, ten miles northeast of downtown Denver, Colorado. The U.S. Army established the RMA in 1942 to produce incendiary munitions and chemical warfare agents such as mustard gas used in World War II. Following the war, and through the early 1980s, the Army continued to use these facilities. Private industry was also encouraged to lease facilities at RMA after the war to foster economic growth in the area, offset operational costs and maintain facilities for national security. Under the lease program, Julius Hyman and Company began producing pesticides in 1946. In 1952, Shell Chemical Company acquired Julius Hyman and Company and continued to produce agricultural pesticides onsite until 1982. These activities over time resulted in widespread and significant environmental contamination across the site.