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  • February 27, 2024

    USEPA and MassDEP approved Effluent Discharge Criteria Memorandum

  • December 20, 2023

    Inspection performed of the completed Enabling Phase site work

  • October 11, 2023

    USEPA approved In-Situ Sequestration of Uranium in Overburden Groundwater Pre-Design Investigation Report

  • September 13, 2023

    USEPA and MassDEP approved the Bedrock Groundwater Pre-Design Investigation Work Plan Addendum Rev 1

  • September 27, 2023

    USEPA and MassDEP approved the 100% Sitewide Soils and Sediment Remedial Design Report Phase I

  • August 31, 2023

    USEPA and MassDEP approved the In-Situ Sequestration of Uranium in Groundwater - Addendum No.1: Material Precipitation Investigation Work Plan, Revision 1

  • August 31, 2023

    USEPA and MassDEP approved the 100% Enabling Phase Remedial Activities Design

  • August 28, 2023

    USEPA and MassDEP issued conditional approval of the Mount Carmel Construction Abatement Work Plan

  • July 13, 2023

    USEPA and MassDEP approved the 2022 Knox Trail Annual Treatment System Report and the Knox Trail Groundwater Treatment System O&M Plan Revision 3

  • July 13, 2023

    USEPA and MassDEP issued conditional approval of 2021-2022 Annual Groundwater Monitoring Report

  • June 30, 2023

    Charter Contracting completed all work associated with AOI-8 and AOI-9

  • June 28, 2023

    USEPA, MassDEP, and Town of Concord citizens/representatives participated in a site walk and site reuse meeting

  • May 30, 2023

    USEPA approved the Transportation and Off-Site Disposal Plan

  • May 11, 2023

    Anchor QEA and HRS Water Consultants presented the Matrix Diffusion Model to USEPA and MassDEP

  • March 29, 2023

    de maximis held a meeting to update community groups on recent remedial activities

  • Timeline

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  • April 28, 2021

    Initial test pits presented in the original PDIWP and five additional test pits identified in SSS PDI Addendum #3 were completed

  • April 22, 2021

    The rotosonic rig is mobilized to Valley Sports and drilling began through overburden at MW-BS52, MW-BS53, MW-SD15

  • April 19, 2021

    The second comprehensive sampling event (as required by the Site Wide Monitoring Plan) is compete

  • April 7, 2021

    Additional geoprobe sampling identified in SSS PDIWP Addendum #3 is complete

  • March 31, 2021

    Community members are updated on PDI progress and remaining investigative work in a community group meeting

  • March 29, 2021

    Access agreement is executed with Valley Sports for access to 2320 Main Street property

  • March 25, 2021

    USEPA approves Bedrock PDWP Addendum regarding Deep Bedrock Wells at MW-13 and MW-28 clusters

  • March, 2021

    Onsite scale is recalibrated and certified for future work

  • February 16 & 23, 2021

    PDI data and initial findings are reviewed and presented to the Agencies

  • February, 2021

    Perimeter site fencing is reinstalled

  • January 15, 2021

    Drill crews demobilize for the winter

  • January, 2021

    Monitoring wells and borings associated with the first round of PDI activities are installed

  • January, 2021

    CMT's are installed around the perimeter of the Holding Basin. Soils are recollected for the Treatability Study

  • 2021

  • December, 2020

    Six piezometers are installed in the cooling water pond

  • December, 2020

    76,875 gallons of IDW-water generated throughout drilling activities are shipped and disposed

  • November, 2020

    Ground penetration radar survey of the landfill is completed and Drone survey of the gabion wall is completed

  • November, 2020

    Step-Test and 7-day continuous Pump-Test are completed at BEW-3. To date, 129,000 gallons of extracted water have been treated

  • November, 2020

    Adequate treatment for uranium and 1,4 dioxane are indicated by the 7-day continuous pump-test and BEW-2

  • November, 2020

    Soil samples are collected from within the Holding Basin for geotechnical data necessary for cover system design. Demobilization of equipment out of the Holding Basin is completed

  • October 27, 2020

    USEPA approves PDI Water Treatment and Disposal Approach

  • October 18, 2020

    USEPA approves RD/RA Appendix C - Holding Basin Containment Pre-Design Investigation Work Plan, Attachment 4 - Addendum 1

  • October 8, 2020

    USEPA approves RDWP Appendices E (QAPP) and J (TSWP)

  • October 1, 2020

    USEPA RDWP Implementation Plans

  • October 2020

    Temporary treatment system for extracted groundwater from BEW pump tests is completed

  • October 2020

    Down hole geophysics at BEW-1 through BEW-4 are completed. Ground Penetrating Radar surveys are completed in Northern Parking lot and landfill area

  • October 2020

    Office trailer and radiation lab setup is completed

  • September 15, 2020

    USEPA approves RDWP and Appendices A, B, C, D, F, H, K, & L

  • September, 2020

    Installation began for bedrock extraction wells through overburden. Mark out and survey of soil sample locations are completed

  • July 27, 2020

    Installation begins on wells MW-BS50 and MW-BS54

  • May, 2020

    Radiation Safety Training was provided for consultants and the Agencies

  • May 2020

    Survey of the 2229 Mainstreet property is complete

  • May 28, 2020

    USEPA approves the Groundwater Treatment System Annual Report. Condition approval is received on the Groundwater NTCRA Construction Completion and Final Report to the Agencies

  • April 17, 2020

    Wetland and property surveys are complete

  • March 23, 2020

    Excess PPW from Building NCTRA is donated to the Concord Fire Department to assist in COVID-19 efforts

  • January 21, 2020

    USEPA approves Trust Agreement

  • December 31, 2019

    Project Coordinator and Supervising Contractor de maximis, inc., is given authorization to proceed by USEPA

  • December 12, 2019

    Settling Defendants designate de maximis inc. as Project Coordinator and Supervising Contractor

  • December 6, 2019

    NMI Superfund Site RD/RA Consent Decree becomes effective