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Latest NMI News Recent Documents

Final Treatment System Operational

Treatment Building upon construction completion.

The Final Treatment System for Groundwater has been in operation since April 2, 2019. More photos of the system can be found in GW NTCRA Progress Photos.

GW Treatment System Vanox Unit Installed

Visit GW NTCRA Progress Photos for more photo updates.

GW Treatment System Vanox Unit with persulfate tank, January 2019.

GW Treatment System Building, January 2019.


Treatment System Building Completely Erected; 100% Remedial Design for Treatment System Approved by EPA 12DEC18

To date, the Groundwater Treatment System building has been completely erected and minor interior work continues. During the coming weeks, it is anticipated that the electrical and plumbing services will be completed, finishing the construction phase of the building.

Concurrent with completion of the building, work has begun to install and assemble the treatment system. The system will be constructed as designed in the 100% Removal Design-Treatment System, approved by the EPA on December 12, 2018. This system will include a metals pre-treatment process prior to treating the groundwater through the Vanox™ Advanced Oxidation Process. This final step in the treatment process is a destructive technology, and it is anticipated that 1,4-dioxane will be treated to nearly non-detectable concentrations.

The Temporary Groundwater Treatment System continues operations. The Demonstration of Compliance Report through September 2018 can be found here.

Installation of the Treatment System is anticipated to last through February, 2019.

Community Involvement  Recent Documents

Public Meeting and Hearing on Proposed Remedial Action Plan

There will be a Public Meeting at 6:30 PM on Wednesday, November 12, 2014 at the Concord Town Hall Meeting Room (22 Monument Square, Concord, MA) on the Proposed Remedial Action Plan.

The Public Hearing on the Proposed Remedial Action Plan for the Nuclear Metals, Inc. Superfund Site will be at 6:30 PM on Wednesday, December 10, 2014 at the Concord Town Hall Meeting Room (22 Monument Square, Concord, MA).

Site Meeting on Building and Groundwater NTCRAs

On 31 AUG 2016, representatives from EPA, MassDEP and de maximis met with members of the 2229 Main Street Committee, CREW, and Green Acton, as well as representatives of the Town of Acton and Acton Water District to present an update on the Building and Groundwater Non-Time-Critical Removal Actions (NTCRAs).

The Groundwater NTCRA AOC became effective in July 2016. Between October 2015 and July 2016, significant further delineation of the extent of groundwater contamination was completed. The next steps under the Groundwater NTCRA will be installation of pumping and monitoring wells, hydraulic testing, and design and construction of an ex-situ groundwater treatment system.

Last updated on January 6, 2021