Stabilization of Disposal Structures at Risk of Failure

Update: This comment period has been extended until June 29, 2020

A 2019 report identified three underground liquid waste disposal structures – 216-Z-2 Crib, 241-Z-361 Settling Tank and 216-Z-9 Crib – to be at risk of age-related failure. To prevent the potential spread of contamination, the Department of Energy and contractor CH2M Hill Plateau Remediation Company are preparing to stabilize the structures by filling them with engineered grout. The grout will provide near-term protection of human health and the environment against potential collapse and release of contamination, while not precluding future remedial or closure actions. Planning for the stabilization work is underway, including design, regulatory documentation and a subcontracting approach for materials and services. Fieldwork preparations will begin in the coming months, with grouting of the two smallest structures planned to start this summer. Grouting of the larger structure (216-Z-9 Crib) is anticipated to be completed within a year. The stabilization work is planned to be done as a Time Critical Removal Action under the Comprehensive Environmental Response, Compensation and Liability Act.

• Prenotice
• Fact Sheet – Stabilizing Disposal Structures at Risk of Failure
• Recommendation and Summary Report 
• Structural Evaluation of Select Aging Structures
  • Quantitative Structure Evaluation
  • Additional Quantitative Analysis for 241-Z-361, PUREX Deep Bed Filter Housing, and the REDOX Sand Filter
  • Qualitative Structure Evaluation
• Presentation – Stabilization of 216-Z-2 Crib, 216-Z-9 Trench, and 241-Z-361 Settling Tank
• 241-Z-361 Tank Video
  • Video 1 of 4
  • Video 2 of 4
  • Video 3 of 4
  • Video 4 of 4
• CHPRC Selects Subcontractor to Stabilize Three Hanford Site Structures with Engineered Grout
• Request for Expression of Interest/Sources Sought
• Request for Proposal 
• Statement of Work 
• Action Memorandum for the Interim Stabilization of 216-Z-2 Crib, 216Z9 Trench, and 241Z361 Settling Tank – Draft A
• Action Memorandum for the Interim Stabilization of 216-Z-2 Crib, 216Z9 Trench, and 241Z361 Settling Tank – Revision 0
  • Action Memorandum Letter
• Documented Safety Analysis for the 216-Z-9 Waste Storage Crib Facility 
• Technical Safety Requirements for the 216-Z-9 Waste Storage Crib Facility 
• Documented Safety Analysis for the 241-Z-361 Settling Tank
• Technical Safety Requirements for the 241-Z-361 Settling Tank
• Department of Energy letter to Environmental Protection Agency
• Environmental Protection Agency letter to Department of Energy 
• Remedial Design/Remedial Action Work Plan for the 200-CW-5, 200-PW-1, 200-PW-3, and 200-PW-6 Operable Units
• Record of Decision Hanford 200 Area Superfund Site 200-CW-5 and 200-PW-1, 200-PW-3, and 200-PW-6 Operable Units
• PUREX Tunnel 2 Expert Panel Presentation
• Presentation - PUREX Tunnel #2 Options Considered
• PUREX Tunnel 2 Expert Panel Report

This website will be updated as more information is available.