Closing the Mulberry Phosphates Phosphogypsum stack system.

The Master Agreement provides for comprehensive maintenance and closure services of the Mulberry Phosphogypsum Stack System located in Polk County, Florida. Services available under this indefinite delivery vehicle include process water management and disposal, process water treatment, general maintenance of dams and dikes, equipment and facility repairs and replacements, emergency construction services, site security, closure construction activities, and long-term maintenance following closure completion. The contract also encompasses ancillary services such as reverse osmosis water treatment, water piping and pump installation, bathymetric surveys, and administrative support. These services are designed to prevent uncontrolled discharges of untreated process water to Florida waters and to facilitate the orderly closure of the phosphogypsum stack system in accordance with environmental regulations and departmental oversight.

The prime contractor is Mosaic Fertilizer, LLC (formerly Cargill Fertilizer, Inc.), with the contracting organization being the Florida Department of Environmental Protection. The original contract was executed on May 23, 2002, with a completion date of May 22, 2057, providing for an extended performance period covering closure construction and long-term maintenance activities. The contract applies statewide throughout Florida and is structured as a Master Agreement with an indefinite delivery format. The initial contract ceiling was established at Twenty-Five Million Dollars, subsequently revised through multiple amendments to reflect closure construction costs of $28,263,867 and a Water Management Fee capped at $29,516,159, with additional Long Term Maintenance Fees established at $2,700,816 upon closure completion. Numerous amendments and work orders have been executed to adjust funding allocations by fiscal year, modify scope elements, and extend performance periods through the contract term.