I am concerned about…

I am concerned about contaminants leaching into the land and destroying the pure water in our water recharge area under the pit. There will be a source water pond and 3 settling basins on the floor of the pit which is only 1.5m from the water table. The pit sits at the top of a hill that overlooks a significant pure water recharge area for the region We all know water runs downhill.
What are the sewage and contaminants that the existing nearby residents and wetland environment need protection from? What are the potential risks that should be disclosed?
Regards
A very concerned Springwater resident