By G9ija

The reservoir holds “primarily saltwater” from a dredging project and officials said its collapse could lead to 340 million gallons of water flooding out in a matter of minute

There are fears if the collapse happens, homes in the mostly agricultural area would be flooded with up to 6m (20ft) of water.

The Florida Department of Environmental Protection said the water is mixed with wastewater and storm water and has elevated levels of phosphorous and nitrogen and is acidic.Advertisement

The ponds sit in stacks of phosphogypsum, a solid radioactive by-product from manufacturing fertiliser.