Governments must assess risk by factoring in costs and the number of lives impacted by a particular law. To that end, the EPA is tasked with regulating hazardous air pollutants like uranium mill tillings which can cause serious health impacts, and even death. Though the deeper the earth cover for the mill tillings, the safer the surrounding community, the EPA decided not to provide a deeper earth cover for uranium mill tillings which would increase lives saved from 95 to 99%. Why did the EPA decide not to increase the depth of earth cover?