Class 2 Permit Modification to the Hanford Dangerous Waste Permit PUBLIC COMMENT PERIOD: Sep. 2 – Nov 1, 2025 The U.S. Department of Energy is holding a 60-day public comment period and meeting on a proposed Class 2 permit modification to the Hanford Dangerous Waste Permit. If approved, the modification would allow the Waste Treatment and Immobilization Plant’s Low-Activity Waste Facility to perform environmental performance demonstration tests in a single and a dual melter configuration. When temporary authorization is approved, BNI will continue work toward the Oct. 15 hot commissioning timeline recently agreed to by the state. A temporary authorization request is also submitted with this modification to allow additional testing in a single melter configuration. The Waste Treatment and Immobilization Plant is in the 200 East Area of the Hanford Site and will vitrify, or immobilize in glass, liquid tank waste from Hanford’s Tank Farms in support of the Direct-Feed Low-Activity Waste Program. The comment period will run from September 2 – November 1, 2025. A hybrid public meeting will be held October 6, at 5:30 p.m. PT, in the Gallery Room of the Richland Public Library, 955 Northgate Drive, Richland, WA 99352. You may participate virtually using Microsoft Teams by following these instructions: Join on your computer or Teams mobile app http://bit.ly/3HSIZXt Or call in (audio only) (509) 931-1284 United States (833) 633-0875 United States (Toll-free) Phone Conference ID: 923 301 973# Please submit comments by November 1, 2025, electronically https://bit.ly/41q5mdD or by mail to: Washington State Department of Ecology 3100 Port of Benton Boulevard Richland, WA 99354 Copies of the proposed plan and supporting documentation will be available online during the public comment period in the Administrative Record at https://bit.ly/4oVTYzY. The Hanford Public Information Repository locations are listed at https://bit.ly/45RrkY5. Questions? Contact Dana Cowley, Hanford Mission Integration Solutions at Dana_C_Gribble@rl.gov or Daina McFadden, Washington State Department of Ecology at Hanford@ecy.wa.gov. To request disability accommodation, please contact Dana Cowley at least 10 working days prior to the event.