Right. The United Kingdom's Environment Agency has determined in a report released to The Guardian that the "dump is virtually certain to be eroded by rising sea levels and to contaminate the Cumbrian coast with large amounts of radioactive waste." The report also noted, in a somewhat underwhelming fashion, that "it is doubtful whether the location of the [dump] site would be chosen for a new facility for near-surface radioactive waste disposal if the choice were being made now." Tanks for nuttin', EA! JK.
It concluded that the 35 million cubic feet (1 million cubic liters) of waste will start leaking on to the shoreline and the coast in "a few hundred to a few thousand years from now." Environmentalists and some citizens aren't happy about it, arguing that use of the site is "unethical, unsustainable and highly dangerous." But the site's operator says the risks are insignificant. As The Guardian noted:
[The] operator, LLW Repository Ltd, said it had introduced new restrictions on the amounts of radioactivity that can be disposed of at the site in order to make sure that radiation doses to people will be "very small" if the wastes are exposed by coastal erosion.
The company's head of science and engineering, Dr Richard Cummings, accepted that erosion could start "in a few hundred years." But he added: "The radioactivity in the wastes will largely have decayed away by this time."
There is, however, some concern that not all of the waste deposited in the past was "low-level"--meaning it could have come from nuclear submarines and weapons, and thus present a greater hazard. The Environment Agency has already asked the consortium of companies that manage the site to "start preparations to defend the site against floods and erosion," The Independent reported.