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Latest NMI News Recent Documents

Temporary Groundwater Treatment System Continues Operations; Construction of Treatment Building Begins

During the treatment system design process, the Temporary Groundwater Treatment System has been operating since May 2017. Continued hydraulic monitoring and routine sampling of the system and surrounding groundwater monitoring wells indicate the system continues to achieve the three performance objectives required by design: maintaining a hydraulic capture zone, decreasing concentrations of 1,4-dioxane in groundwater, and maintaining acceptable treatment system effluent concentrations. The Demonstration of Compliance Report through June 2018 can be found here.

Work during the spring and summer of 2018 has been focused on completing the final design of the permanent treatment system and continued operations of the Temporary Groundwater Treatment system.

A site specific treatability study was completed in 2017 to identify the best ex-situ treatment option for the 1,4-dioxane and VOCs in the groundwater plume. Based on this study, an Advanced Oxidation Process (AOP) was selected as the most effective treatment option due to its ability to degrade 1,4-dioxane. A 100% Design Report for the system was submitted to the EPA in July 2018. Construction of the Treatment Building began in September and the final treatment system is expected to be installed and operational before the end of 2018.

Temporary Groundwater Treatment System on the Knox Trail Property, operating since May 2017 and maintaining the hydraulic containment.

Temporary Groundwater Treatment System Operational

Since May 23, 2017, a temporary groundwater treatment system has been operating as part of the NMI Superfund Site Non-Time-Critical Removal Action (NTCRA) for Groundwater. This treatment system is designed to extract groundwater and create a zone of hydraulic containment to minimize movement of 1,4-dioxane. This temporary system has been implemented to operate during the design phase of the permanent treatment system. Hydraulic monitoring and analytical results indicate that performance objectives for the temporary treatment system are being achieved, as supported by the data included in the December 2017 Demonstration of Compliance Report, submitted to EPA on January 10, 2018.

Public Information Meeting

USEPA will host a Public Information Meeting for Nuclear Metals, Inc. Superfund site on Thursday, May 25, 2017 at 6:30 pm. The meeting will be held at Acton Town Hall, 472 Main Street Room 204, Acton, MA. If you have any questions or special needs, please contact Sarah White, EPA Community Involvement Coordinator, at 617-918-1026 or white.sarah@epa.gov. The latest site update can be accessed here.

Community Involvement  Recent Documents

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.

EPA Issues Fact Sheet on NMI Activities Update

In light of building demolition resuming on 19 APR 16, EPA issued a fact sheet to update on the status of activities on site and the various winter activities performed for the test of the Assabet 1A and 2A production wells to define the “capture zone,” which will assist in determining an effective location to install and test a pumping well.

Last updated on October 25, 2018