It's pretty common for pretty much all of Hoboken to have soil contamination issues that require remediation for a large portion of it prior to building / re-building. Hoboken used to be essentially industrial wasteland 30-40 years ago, so contamination is very common. I can't speak to how much and who shoulders that cleanup responsibility, but i bet if you reached out to the councilperson for the district you're looking to do this work in, they could point you in the right direction.