December 6, 2019
NMI Superfund Site RD/RA Consent Decree becomes effective.
December 9, 2019
Summary of On-Going Work under the Groundwater NTCRA is submitted.
December 12, 2019
Settling Defendants (SDs) designate de maximis, inc. as Project Coordinator and Supervising Contractor.
December 31, 2019
Project Coordinator and Supervising Contractor de maximis, inc., is given Authorization to Proceed by USEPA.
January 5, 2020
Trust Agreement is submitted to USEPA for approval.
January 21, 2020
USEPA approves Trust Agreement.
March 23, 2020
Excess PPE from Building NCTRA is donated to the Concord Fire Department to assist in COVID-19 efforts.
March 26, 2020
Remedial Design Work Plan and associated documents are submitted to USEPA for approval.
April 2, 2020
Groundwater Treatment System Annual Report is submitted to USEPA in accordance with the O&M Plan.
April 3, 2020
Groundwater NTCRA Construction Completion and Final Report are submitted to Agencies.
April 17, 2020
Wetland and property surveys are complete.
May 28, 2020
USEPA approves the Groundwater Treatment System Annual Report. Conditional approval is received on the Groundwater NTCRA Construction Completion and Final Report to the Agencies.
Survey of the 2229 Main Street property is complete.
Radiation Safety Training was provided for consultants and the Agencies.
July 27, 2020
Installation begins on wells MW-BS50 and MW-BS54.
Installation began for bedrock extraction wells through overburden. Mark out and survey of soil sample locations are completed.
September 11, 2020
Final RDWP and all appendices apart form Appendices E & I are submitted.
September 15, 2020
USEPA approves RDWP and Appendices A, B, C, D, F, H, K & L.
Office trailer and radiation lab setup is complete.
Down hole geophysics at BEW1 through BEW-4 are completed. Ground Penetrating Radar surveys are completed in Northern Parking lot and landfill area.
Temporary treatment system for extracted groundwater from BEW pump tests is complete.
October 1, 2020
USEPA approves RDWP Implementation Plans.
October 8, 2020
USEPA approves RDWP Appendices E (QAPP) and J (TSWP).
October 18, 2020
USEPA approves RD/RA Appendix C - Holding Basin Containment Pre-Design Investigation Work Plan, Attachment 4 - Addendum 1 (submitted October 13, 2020).
October 27, 2020
USEPA approves PDI Water Treatment and Disposal Approach (submitted October 20, 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 safely and successfully.
Adequate treatment for uranium and 1,4 dioxane are indicated by the 7-day continuous Pump-Test at BEW-2.
Step-Test and 7-day continuous Pump-Test are completed at BEW-3. To date, 129,000 gallons of extracted water has been treated.
Ground Penetration Radar survey of the landfill is completed. Drone survey of the gabion wall is complete.
76,875 gallons of IDW-water generated throughout drilling activities are shipped and disposed.
Six Piezometers are installed in the Cooling Water Pond.
Recollection of Treatability Study Sample Soils is submitted to USEPA.
Monitoring wells and borings associated with the first round of PDI activities are installed.
CMT's are installed around the perimeter of the Holding Basin. Soils are recollected for the Treatability Study.
January 15, 2021
Drill crews demobilize for the winter.
Perimeter site fencing is reinstalled.
February 16, 2021 & February 23, 2021
PDI data and initial findings are reviewed and presented to the Agencies.
On-site scale is re-calibrated and certified for future work.
March 24, 2021
Site Wide Soild and Sediment PDWP Addendum #3 is submitted.
March 25, 2021
USEPA approves Bedrock PDWP Addendum regarding Deep Bedrock Wells at MW-13 and MW-28 clusters.
March 29, 2021
Access agreement is executed with Valley Sports for access to 2320 Main Street property.
March 31, 2021
Community members are updated on PDI progress and remaining investigative work in a community group meeting.
April 7, 2021
Additional geoprobe sampling identified in SSS PDIWP Addendum #3 is complete.
April 19, 2021
The second comprehensive sampling event (as required by the Site Wide Monitoring Plan) is complete.
April 22, 2021
The rotosonic rig is mobilized to Valley Sports and drilling began through overburden at MW-BS52, MW-BS53, and MW-SD15.
April 28, 2021
Initial test pits presented in the original PDIWP and five additional test pits identified in SSS PDI Addendum #3 are complete.