Dupont said the were taking care of the removal. It is very easy to replace 9 45 ft spruces for 93k. Hell they will have plenty of money left over to be honest.
By the way, I have no fear at all that the soil needs to be treated. Just using common sense, Imprelis absolutley knocked out violets and ground ivy last year. Take a walk around your neighborhoods and look at all the pretty purple flowers this year. That leads me to believe it is flushed from the soils.