The river sludge is scary in that it contains far more than Tony Soprano's former partners. The fly ash should be safer.
I am concerned however about moving the crap. 500k tons of each every year over the road. If the other trucks you see, with the tarp on an arm that swings over the load like an awning, are any indication of the way this stuff will be transported, we're in trouble.
I assume the sludge will be thoroughly drained to cut shipping costs. If it's allowed to dry then dust becomes a problem like the fly ash. The trucks I see going by work everyday that haul trash into the County Trash-to-Steam plant and haul the ash out to the landfills, leave a trail of dirt and drippy stuff. I'd bet it's not good for children and other living things.