Piles of lead at a range is irrelevant. I'm not preaching that lead is poisoning the drinking water supplies or such nonsense. The issue is simple and will likely end the varmint hunter's sport:
Killing animals with lead bullets and leaving the carcasses in the field results in lead poisoning of wildlife. The raptors feed upon the dead and as I've said, only a piece of lead the size of a grain of rice is required to kill a raptor.
Most lead is non-leachable and doesn't wash into our water supplies from dirty range practices. This issue is solely related to fresh dead animals being contaminated with lead which are then consumed by predators.
Lead is already illegal in areas inhabited by the vast amount of California Condors (a whopping 71 of them remaining in existence last I checked). The Condors were eating varmint hunters left out kills.
This issue bothers me immensely because all it would take is 5 minutes of cleanup after a shoot and glad trash bag to protect the future of lead in shooting sports overall...yet the varmint hunters don't want to be told what to do. (and the uplander will pay the price for the varminter's habits...lead banned in all circumstances)