The Twin Cities Army Ammunition Plant (TCAAP) Superfund site in Arden Hills operated for several decades during a time when there were few laws governing the disposal of chemicals. The Army disposed of industrial wastes with accepted practices at the time, including on-site dumping, burial, and open burning. The manufacturing processes and historical disposal areas at the facility caused contamination of groundwater, soil, sediment, and surface water.
The Army has a proposed plan for addressing the sediment in Round Lake (located within the TCAAP site) which is contaminated with metals and polychlorinated biphenyls. The Army plans to dredge contaminated sediments from Round Lake and dispose of them at an offsite disposal location. This clean-up strategy was one of several options considered in a feasibility study completed in 2020 and reviewed by various project partners, including the MPCA. Dredging and offsite disposal provides a more permanent risk reduction and clean-up strategy compared to other technologies considered. Learn more on the TCAAP web page.
The public comment period on the Army's cleanup plan runs to Friday, August 13, 2021. The Army’s planned outreach activities include:
- Open house: July 20, 2021, 10:00 a.m. to 3:00 p.m., at the Arden Hills Army Training Site (4761 Hamline Ave N, Arden Hills, MN 55112 – call 651-282-4420 for directions)
- Restoration Advisory Board virtual meeting: July 20, 2021, 7:00 p.m. using Microsoft Teams. Oral comments will be accepted at the end of the meeting. Both MPCA and EPA are represented on the board and will attend the virtual meeting. Contact Kay Toye (520-903-4363) to get meeting access information and register to provide oral comments.
Send written comments on the proposed plan to:
- U.S. Army Environmental Command
2455 Reynolds Road, Mailstop 112
JBSA Fort Sam Houston, TX 78234-7588
After the public comment period, the Army will address all comments for the administrative record and incorporate any significant comments into a revised plan and ultimately select a remedy for sediment cleanup at Round Lake.