This was previously discussed on HN: https://news.ycombinator.com/item?id=28979532
The linked article is about how NB went out of their way to shut out federal investigators. If it’s environmental, it’s possible the NB government is trying to cover it up.
This is also briefly touched on in this article:
> The scientist said teams are ready to begin the research, but “New Brunswick has specifically told us not to go forward with that work”.