We started this issue by reconstructing a deal in Gadsden, Alabama: a $430 million automotive components campus, rising on ground that was a Superfund steel site when EPA began cleanup in 2007. Nearly two decades of environmental work before private capital arrived. That timeline forced a question we couldn't set aside. If proof expires and your team can only keep a few site uncertainties current, which ones do you retire first? Most of what follows is our framework for making that call.