System and Method is described that controls the release of contaminated water by rapidly freezing the ground water, including salt water, which permeates the area underneath the a contamination source, so that the resulting ice lens mitigates the extent to which radioactive water is released into the environment. An aperture in the containment area allows the dispersal and dilution of the contaminates by allowing in ground water from outside, and/or removing water from the containment area. The variable aperture may be a physical valve or preferably an opening in the ice shield which size may be controlled by freezing or thawing portions of the ice shield.
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