S. 4005, the Responsible Containment Reauthorization Act of 2026, extends the operating authorization for a uranium mill tailings disposal site located in Mesa County, Colorado. The bill amends the Uranium Mill Tailings Radiation Control Act of 1978 by removing a September 30, 2031 deadline, allowing the disposal site to continue operating until it reaches its designed storage capacity rather than being shut down at a fixed date. This change primarily affects the site's operators and the surrounding Colorado community by providing certainty that the facility can complete its intended mission of safely containing radioactive waste materials. The bill was introduced by Senators Hickenlooper, Curtis, and Bennet and does not specify new funding allocations in the provided text.
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