In cases of environmental contamination, that can limit what could be there in the future, for example a former car repair shop (that you found the stale yelp reviews for) is likely sufficiently contaminated that it can only ever be something like that, you won't be able to put a daycare center or restaurant in there. 

That means that the prior leaks and soil/groundwater contamination have already been taken care of. 

thanksYes I have lots of experience cleaning contaminated sites up.

It's not something someone can fix-this worry they would have about soil contamination affecting themselves and their family and their pets.

Wetlands, underground oil storage tanks, easements, contaminates of other kinds and a host of other issues could exit.

I have made money on 2 foot strips along someones property.I have purchased environmentally contaminated parcels and made millions oh a $500 investment.

I would not allow tenant to do this as they could easily contaminate the petri dishes.

I've used it in pet, mold, cigarette and sewage contaminated structures with near perfect results. 

So even elements that don’t appear damaged can be contaminated.

Radioactive Thorium contamination in several areas of town as well as the DuPage River going back many years.