Here's a study of the risks of storing nuclear waste on the surface:

https://www.bund.net/fileadmin/user_upload_bund/publikationen/atomkraft/atomkraft_zwischenlager_studie_2020.pdf Since this is a pdf I can not provide a link to the translated version, but you can download the pdf and have it translated by e.g. the Google Translator yourself. Sorry for the inconvinience.