Tracy
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Why not bury it in a subduction zone? Like 1000 ft down or so away from human activity. Even with a half life of 100,000s of years, there's no worries. It's taken down to the earth's mantle.
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Well, maybe. The subduction zone off of Washington and Oregon allows the Casdadia plate to slide under those states to the Cascade Mountains where molten lava formed in the subduction zone is spewed out of the volcanoes (Rainer, St. Helen's). The subduction zone is about 12 miles deep under the Cascades, offshore it is less and extends out to an offshore trench. I suppose the nuclear waste could be dumped into the trench where it would be slowly subducted. It might take a million years for the radioactive material to get to the volcanoes. Since humans will have done themselves in long before that it would not be a problem.
