Dilution is the solution...
That seems to be the EPA’s reaction to the Colorado mine disaster, even though they are holding our feet to the fire to control stormwater runoff from a parking lot...
Not so much, when the reporter from NBC very clearly showed that the “heavy” part of the spill (i.e., the dangerous, lead/arsenic part) was laying on the floor of the river.
How did they clearly show it?
Everyone knows that this material settled out to the bottom. This is one of the reasons they don’t dredge behind dams downstream of the Hanford Nuclear Reservation, because the material is contaminated with all sorts of heavy metals and radioactive materials.