2000 PPM is 0.2% or one-in-fivehundred, right? That’s massive pollution. My layman’s logic would suggest you need to dump 0.2% of total aquifer volume of 100% PFAS to reach that level? And then I expect pollution to spread in a semi-sphere unless there are rocky sediments. Edit: thinking more about water, perhaps you can dump less in wetter conditions and then in a drought get higher values because PFAS won’t evaporate. But still, it suggests tons and tons of dumping?