This aerial photo taken from an airplane shows a reservoir near the old Piney Point phosphate mine. Photo / AP
This aerial photo taken from an airplane shows a reservoir near the old Piney Point phosphate mine. Photo / AP
Florida Governor Ron DeSantis declared a state of emergency on Saturday after a significant leak at a large pond of wastewater threatened to flood roads and burst a system that stores polluted waters.
Officials in Florida ordered more than 300 homes to be evacuated and closed off a highway near the large reservoir in the Tampa Bay area north of Bradenton.
Residents who live around the Piney Point reservoir received an alert via text saying to leave the area immediately because the collapse was "imminent." Authorities expanded the evacuation area later on Saturday to include more homes, but said they were not planning to open shelters.
The Florida Department of Environmental Protection says a break was detected on Friday in one of the walls of a 33ha pond that has a depth of 8m and holds millions of gallons of water containing phosphorus and nitrogen from an old phosphate plant.
Officials brought in rocks and materials to plug the hole in the pond late on Friday into Saturday, but the attempt was unsuccessful. Manatee County Administrator Scott Hopes said at a press conference on Saturday that the most pressing concern is that the water could flood the area, which he said was agricultural and low in population density.
"We are talking about the potential of about 600 million gallons (2.3 billion liters) within a matter of seconds and minutes leaving that retention pool and going around the surrounding area," Hopes said.
A new expanded emergency evacuation order was sent out to an area around Piney Point, the former phosphate mine. Photo / AP
Workers have been pumping out thousands of gallons per minute at the site to bring the volume down in the event the pond bursts. Pumping the entire pond would take 10 to 12 days.
Others have been working to chart the path to control how the water flows from the pond into the Tampa Bay. DeSantis' declaration of a state of emergency allocates more pumps and cranes to the area.
The owner, HRK Holdings, did not respond to a request for comment on Saturday.
The pond where the leak was discovered is at the old Piney Point phosphate mine, sitting in a stack of phosphogypsum, a waste product from manufacturing fertiliser that is radioactive. It contains small amounts of naturally occurring radium and uranium, and the stacks can also release large concentrations of radon gas.
A significant leak at a large pond of wastewater threatened to flood roads and burst a system that stores polluted waters. Photo / AP
Hopes says that if the pond collapses, there is a risk it could destabilise the walls of other areas in the plant.
"The pond is basically salt water. We saw ducks yesterday, there are snooks swimming in there. It's sustaining wildlife. That's not the case for the other two pools," he said, adding the wastewater in the other ponds would need to be treated to reduce ammonium content and other materials.
The executive order declaring the state of emergency said the breached structure has 1.8 billion liters of seawater mixed with process water and the embankment materials from the old fertiliser manufacturing plant.
Agriculture Commissioner Nikki Fried urged the governor in a letter to convene an emergency session of the state cabinet to discuss a plan, adding that this property has seen similar leaks in the past.
"The immediate evacuation of residents, disruption of families during Easter weekend, and potential environmental catastrophe requires the attention and action of Florida's statewide elected leadership," Fried said.
In 2016, more than 200 million gallons of contaminated waste water from another fertiliser plant in central Florida leaked into one of the state's main aquifers after a massive sinkhole opened up in a pond of a phosphogypsum stack.
There are at least 70 gypsum stacks in the US and about 27 in Florida, mostly in the region of west-central Florida. The wastewater stored in the gypsum stacks can't be seen from the ground as the piles surrounding the structure can go as high as 150m.
