FDEP executes Mosaic New Wales sinkhole consent order

The Florida Department of Environmental Protection today executed a consent order with Mosaic following the sinkhole at its New Wales facility.

The consent order requires numerous actions that will ensure Mosaic remains accountable for recovering the process water, repairing the sinkhole and protecting Florida’s drinking and groundwater resources. Key provisions of the Consent Order require Mosaic to:

• Implement a Corrective Action and Grouting Plan to permanently seal the sinkhole and verify the long-term effectiveness of the repair work.
• Operate Recovery Well System to continue capturing impacted groundwater from the Floridan Aquifer and prevent any migration of process water away from the site.

• Install New Standby Recovery Well to be activated if the primary recovery well becomes inoperable or the enhanced monitoring program indicates that recovery operations need to be expanded to ensure the complete onsite capture of the process water.

• Implement an Enhanced On-site Monitoring Program to monitor the success of the recovery well system and verify no off-site transport of the process water. This includes more frequent monitoring and the installation of additional monitoring wells.

• Implement a Comprehensive Off-site Monitoring Program at least through December 2018 to ensure that off-site groundwater and private drinking water wells are monitored to verify that residents continue to have a safe source of drinking water.

• Remediate or provide alternative source of drinking water if off-site wells are affected by the process water.

• Perform a Hydrogeological and Geotechnical Site Investigation to evaluate the potential for any additional subsurface anomalies at the active phosphogypsum stack system at the New Wales site.

• Perform Additional Hydrogeological and Geotechnical Site Investigations to evaluate the subsurface conditions at the other three active Mosaic phosphogypsum stacks located near Bartow, Riverview and Plant City, Florida.

• Provide at least $40 million in financial assurance for the performance of the on-site corrective actions, off-site monitoring, and any potential off-site rehabilitation. Mosaic must increase the financial assurance if cost estimates for the actions increase.



A copy of the consent order and more information on DEP's ongoing oversight at the New Wales facility is available here.