NAVAL INDUSTRIAL RESERVE ORDNANCE PLANT
On this page:
- What Is Being Done to Clean Up the Site?
- What Is the Current Site Status?
- Sampling and Monitoring
- Operable Units (opens new page)
- Cleanup Progress (opens new page)
The 83-acre Naval Industrial Reserve Ordnance Plant (NIROP) site is located about 700 feet from the Mississippi River in Fridley, Minnesota. The U.S. Navy and its contractors have produced advanced weapons systems at the facility since 1940. In 1981, trichloroethylene (TCE) was discovered in on-site groundwater wells and in the City of Minneapolis’ drinking water treatment plant intake pipe, located in the Mississippi River about 1,500 feet downstream from the site. Operation and maintenance of the site’s remedy, including groundwater monitoring and treatment, are ongoing.
What Is Being Done to Clean Up the Site?
The U.S. Navy is conducting the cleanup and groundwater monitoring action at the site under the oversight of EPA and the Minnesota Pollution Control Agency (MPCA).
EPA has conducted several five-year reviews of the site’s remedy. These reviews ensure that the remedies put in place protect public health and the environment, and function as intended by site decision documents. The most recent review concluded that response actions at the site are in accordance with the remedy selected by EPA and that the remedy continues to be protective of human health and the environment in the short term. The U.S. Navy is addressing several issues raised in the most recent five-year review concerning the improvement of the long-term effectiveness of the groundwater remedy under EPA and MPCA oversight. The site’s last five-year review was completed in October 2013.
What Is the Current Site Status?
As of August 2014, the area known as Operable Unit 2, or OU2 will no longer be on the National Priorities List or NPL. The Superfund law allows for deletion of cleaned up sections even if the site as a whole cannot be delisted from the NPL at this time. The OU2 area includes soil within the legal boundaries of the NIROP Superfund site, excluding soil underlying the former plating shop area.
The following areas will remain on the NPL and are not being considered for deletion as part of this action: OU1 and OU3. OU1 includes the contaminated groundwater within and originating from the NIROP site. OU3 includes soil underlying the form plating shop area.
This partial deletion does not stop future actions, in the event of changes in the site conditions. It does not create, change or cancel any individual’s rights or responsibilities. It also does not change EPA’s right to take enforcement actions when appropriate.
Sampling and Monitoring
During cleanup, a site can be divided into a number of distinct areas depending on its complexity. These areas, called operable units (OUs), may address geographic areas, specific problems, or areas where a specific action is required. Examples of typical operable units include construction of a groundwater pump and treatment system or construction of a cap over a landfill.