This also happened in Ukraine. The capsule was lost in a gravel pit and ended up being built into the wall of an apartment and several people died as a result.
https://en.wikipedia.org/wiki/Kramatorsk_radiological_accide...
https://en.wikipedia.org/wiki/Kramatorsk_radiological_accide...
In any case the primary expense is going to be one of paying off all the people to get the right approvals. Crunching the numbers on how to safely rectify it and actually going through those actions will be dirt cheap compared to getting someone with the "right credentials" to tell the government, the insurers and whoever else that your obvious solution any highschooler can crunch the numbers on is in fact acceptable
[1] https://www.hemmings.com/stories/2017/10/17/misunderstood-ca...