Vertical farming is cool stuff

I'm not so worried about what's in the air, but what's in the water or will move like/with water underground. The surface soil might test clean if the contaminants have been driven down by the natural cycle of rain water. But what happens when plants start rooting and irrigation is used? If there's an undetected shift in the water table or sudden contamination thanks to abandoned sewers or utilities decaying, what had been a safe field could all of a sudden be cancer central.

I'm really against developing on greenfield sites as much as farming on brownfield sites. Undisturbed greenfield sites should be kept for farming as farming as possible. Brownfield sites should be kept for development.
 
We've been turning abandoned lots into small community gardens in metro Boston (and other cities) for several decades now. Have such problems arisen in these smaller-scale enterprises?
 
My cousin who lives in Providence has friends who farm on abandoned lots.
 
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