Project Experience

Highlights of Radiological Project Experience

Project Coordination, Construction Management, IQAT, and Public Relations for a former low-level radioactive waste landfill permitted by the state. Radioactive contaminants included Hydrogen-3 (Tritium), Carbon-14, Americium-241, Cesium-137, Radium-226, Thorium-232, Technetium-99, Strontium-90, Plutonium-238, 239/240, and Iodine-129. Project specifics include:

  • Pumping and solidifying over one million gallons of radioactive leachate
  • Construction of a 60-acre cap and storm water drainage system
  • Enlargement of the detention basin and construction of perimeter drainage channels
  • Demolition and disposal of all buildings inside the Restricted Area

Project Manager and Construction Manager for implementation of the Decommissioning Plan (10 CFR Part 20 Subpart E) of a former metal processing plant with industrial debris and both radiological and non-radiological slag. Specifics include:

  • The site closure incorporated a rip-rap cover designed and installed in accordance with NRC regulations. The project site was located on a steep slope adjacent to a large river and required special equipment and construction methods to build the rip-rap cover.
  • Radiological contaminants included naturally occurring uranium (U-238, U-234, U-235) and thorium (T-232, T-228) and their radioactive progenies.
  • Coordination of all work with the NRC (regional and headquarters), the state and local municipal departments.
  • Termination of the source material license.

Project Coordinator and General Contractor for the implementation of the RI/FS, Engineering Evaluation/Cost Analysis (EE/CA),  and Non-Time-Critical Removal Actions (NTCRAs) at a former specialty metal research and development facility licensed to possess enriched, natural, and depleted uranium (DU) and natural thorium. Specifics include:

  • Delineation of contamination in an on-site pond, landfill, sphagnum bog, and groundwater plumes of VOCs and uranium and preparing plan for a removal action to address buried drums.
  • Preparing the EE/CA to evaluate options for the 5-acres of Site buildings and equipment contaminated with DU and beryllium.
  • Implementation of the $65 million Removal Action that included emptying and demolishing the buildings with off-site disposal.
  • Groundwater investigation for plume delineation.
  • Coordination with EPA and state agencies and Radiological Control Program and handling public relations with two highly active citizens groups, including preparation and management of a public communications website.

Client’s Oversight Representative for the demolition and remediation of radiological and other contamination associated with a portion of a building under the Formerly Utilized Sites Remedial Action Program (FUSRAP).

  • Represent the client’s commercial and technical interests during development and implementation of the project plans.
  • Oversee all field work performed by their contractor and works closely with the US Army Corps of Engineers field representatives during implementation of the remedy.
  • Coordination of remediation work with ongoing plant operations.

Project Manager and Construction Manager for a river dredging and disposal project with low-level radioactive waste with uranium, radium, and thorium (along with PCBs, chlorinated compounds, and heavy metals) contaminants.

  • To avoid commingling rad and non-rad waste, a site-specific, dedicated, low-level radiological containment facility was designed and constructed.
  • The containment facility, which meets the Toxic Substance Control Act (TSCA) design requirements, contains nearly 750,000 cubic yards of dredged material from the river.
  • de maximis held a “Possession Only” license for low-level radioactive waste issued by the state Department of Health.
  • Provided health physicist oversight for the duration of the dredged material transfer operations and performed employee and field monitoring.
  • Upon completion of the dredging project, no radiological contamination was detected outside the containment facility and the state terminated the license without any further action.

Project Manager and Construction Manager for Superfund removal action performed under a CERCLA 106 Unilateral Consent Order. This site involved a former metal reclamation facility which had processed low‑level radioactive materials (radioactive thorium compounds along with cadmium and nickel contaminated soils and mixed waste residues).

  •  The project involved the characterization, removal and disposal of approximately 1000 drums and containers, and 3,500 cubic yards of contaminated soil.
  • de maximis also coordinated the preparation and development of work plans for additional contaminant studies that were performed subsequent to the initial removal action.