Really, people. The usgs is going on about that this cluster is 'natural' and organic. 'These things happen'. And old Mr. Google shows what is going on.
This is a classic waste injection layout. The trucks drive into the shed and dump the waste. They are all exactly like this.
This shows a truck in the station.
Anyhow, it should stop soon, when they stop handling gas frack waste at twice the normal rate. As usual, it will all be denied. "Wasn't me."