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February 27, 2024
USEPA and MassDEP approved Effluent Discharge Criteria Memorandum
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December 20, 2023
Inspection performed of the completed Enabling Phase site work
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October 11, 2023
USEPA approved In-Situ Sequestration of Uranium in Overburden Groundwater Pre-Design Investigation Report
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September 13, 2023
USEPA and MassDEP approved the Bedrock Groundwater Pre-Design Investigation Work Plan Addendum Rev 1
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September 27, 2023
USEPA and MassDEP approved the 100% Sitewide Soils and Sediment Remedial Design Report Phase I
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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
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August 31, 2023
USEPA and MassDEP approved the 100% Enabling Phase Remedial Activities Design
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August 28, 2023
USEPA and MassDEP issued conditional approval of the Mount Carmel Construction Abatement Work Plan
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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
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July 13, 2023
USEPA and MassDEP issued conditional approval of 2021-2022 Annual Groundwater Monitoring Report
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June 30, 2023
Charter Contracting completed all work associated with AOI-8 and AOI-9
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June 28, 2023
USEPA, MassDEP, and Town of Concord citizens/representatives participated in a site walk and site reuse meeting
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May 30, 2023
USEPA approved the Transportation and Off-Site Disposal Plan
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May 11, 2023
Anchor QEA and HRS Water Consultants presented the Matrix Diffusion Model to USEPA and MassDEP
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March 29, 2023
de maximis held a meeting to update community groups on recent remedial activities
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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
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April 22, 2021
The rotosonic rig is mobilized to Valley Sports and drilling began through overburden at MW-BS52, MW-BS53, MW-SD15
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April 19, 2021
The second comprehensive sampling event (as required by the Site Wide Monitoring Plan) is compete
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April 7, 2021
Additional geoprobe sampling identified in SSS PDIWP Addendum #3 is complete
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March 31, 2021
Community members are updated on PDI progress and remaining investigative work in a community group meeting
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March 29, 2021
Access agreement is executed with Valley Sports for access to 2320 Main Street property
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March 25, 2021
USEPA approves Bedrock PDWP Addendum regarding Deep Bedrock Wells at MW-13 and MW-28 clusters
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March, 2021
Onsite scale is recalibrated and certified for future work
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February 16 & 23, 2021
PDI data and initial findings are reviewed and presented to the Agencies
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February, 2021
Perimeter site fencing is reinstalled
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January 15, 2021
Drill crews demobilize for the winter
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January, 2021
Monitoring wells and borings associated with the first round of PDI activities are installed
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January, 2021
CMT's are installed around the perimeter of the Holding Basin. Soils are recollected for the Treatability Study
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2021
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December, 2020
Six piezometers are installed in the cooling water pond
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December, 2020
76,875 gallons of IDW-water generated throughout drilling activities are shipped and disposed
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November, 2020
Ground penetration radar survey of the landfill is completed and Drone survey of the gabion wall is completed
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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
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November, 2020
Adequate treatment for uranium and 1,4 dioxane are indicated by the 7-day continuous pump-test and BEW-2
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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
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October 27, 2020
USEPA approves PDI Water Treatment and Disposal Approach
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October 18, 2020
USEPA approves RD/RA Appendix C - Holding Basin Containment Pre-Design Investigation Work Plan, Attachment 4 - Addendum 1
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October 8, 2020
USEPA approves RDWP Appendices E (QAPP) and J (TSWP)
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October 1, 2020
USEPA RDWP Implementation Plans
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October 2020
Temporary treatment system for extracted groundwater from BEW pump tests is completed
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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
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October 2020
Office trailer and radiation lab setup is completed
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September 15, 2020
USEPA approves RDWP and Appendices A, B, C, D, F, H, K, & L
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September, 2020
Installation began for bedrock extraction wells through overburden. Mark out and survey of soil sample locations are completed
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July 27, 2020
Installation begins on wells MW-BS50 and MW-BS54
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May, 2020
Radiation Safety Training was provided for consultants and the Agencies
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May 2020
Survey of the 2229 Mainstreet property is complete
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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
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April 17, 2020
Wetland and property surveys are complete
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March 23, 2020
Excess PPW from Building NCTRA is donated to the Concord Fire Department to assist in COVID-19 efforts
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January 21, 2020
USEPA approves Trust Agreement
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December 31, 2019
Project Coordinator and Supervising Contractor de maximis, inc., is given authorization to proceed by USEPA
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December 12, 2019
Settling Defendants designate de maximis inc. as Project Coordinator and Supervising Contractor
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December 6, 2019
NMI Superfund Site RD/RA Consent Decree becomes effective