Pre RD/RA

Superfund work performed by the Respondents prior to the Remedial Design / Remedial Action includes performance of the Remedial Investigation and Feasibility Study from June 2003 through October 2014, the Engineering Evaluation / Cost Analysis (EE/CA) issued in 2008, the Non Time-Critical Removal Action (NTCRA) for Building demolition and removal from 2011 – September 2016, and the Groundwater NTCRA from 2016 through 2019.

Detailed information and documents from the RI/FS, EE/CA, Building NTCRA, and GW NTCRA can be found on the Pre RDRA website.

NMI Site Building NTCRA 2011-2016
The NTCRA included, but was not limited to, the removal of all contents from, followed by the demolition of, a two-story, five-section interconnected building (Buildings A, B, C, D, and E), a tank house, a hydrogen peroxide tank house, two gas cylinder storage huts, Pump House #2 and four “Butler” metal storage buildings, which had a combined footprint of approximately 185,000 square feet.
Building C Contents and 1,400 ton Extrusion Press
Buildings contents were removed and equipment and machines were dismantled and hauled off-site for disposal prior to building demolition completion.
Hauling Waste for Off-site Disposal
912 trucks plus 2 tankers hauled approximately 23.5 million pounds of waste from the site for disposal at US Ecology in Idaho.
Three Phases of Demolition
Phase 1 – Removal of “high hazard” materials; utility decommissioning; removal of chemicals; and removal of combustibles; • Phase 2 – Removal of equipment and manufacturing systems; • Phase 3 – Building demolition included asbestos abatement, PCB, universal waste removal, and beryllium waste removal, filling of subsurface features, and placement of temporary cover (Building E Mezzanine Demolition, July 2016)
Temporary Liner Placement
Building slabs were covered with temporary liner during Building NTCRA to prepare for RDRA.
Building Demolition Complete
NMI Superfund Site in 2016 following completion of Building NTCRA.
GW NTCRA July 2016 - Dec 2019
The GW NTCRA included the design, installation and monitoring of the groundwater treatment system for the hydraulic capture of 1,4-dioxane and VOC plumes in overburden and shallow bedrock groundwater in the NTCRA Area of the Site.
Temporary GW Treatment System
The Temporary Groundwater Treatment System operated on the Knox Trail Property from May 2017 to April 2019, maintaining the hydraulic containment while the permanent GW Treatment system was constructed.
Groundwater Treatment Building
The Groundwater NTCRA concluded with the construction and operation of the Treatment Building and start of RDRA.
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