Best results matter, not cost or inconvenience
What should be sought here is the best result. Total cleanup is not always the best option because it disturbs and distributes the pollutant. There have been oil spills where it was insisted that total cleanup be done and the oil company argued that environmentally it would be better to do a partial cleanup. In one area complete cleanup was done, in another partial cleanup. Guess what, the oil company was correct. The partially cleaned area recovered faster and better.
Now I don't know what the right answer is in this case. All I am saying is that the emphasis should be on the best result. If all if the residue needs to be removed, it should be. However, the partial removal may actually yield a better result. People jumping up and down and yelling about something aren't always right, often they are just most noticed.
Environmentally, what is the best way to clean this site?
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