The disposal layer at the Waste Isolation Pilot Plant (WIPP)site is

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The disposal layer at the Waste Isolation Pilot Plant (WIPP) site is bedded salt. This layer was chosen because it has a low permeability that helps to contain the waste and prevent any leaks into the surrounding environment. Additionally, the salt has the ability to "creep" over time, which will gradually close any openings or voids left by the waste emplacement. This long-term stability and impermeability make bedded salt an ideal material for nuclear waste disposal.

The Disposal Layer at the Waste Isolation Pilot Plant (WIPP)site