Author(s)

M. Koch & T.T. Shinkawa

Abstract

The phosphate industry in Florida produces phosphate in the form of phosphoric acid. The waste-product phosphogypsum (PG) is pumped out as a slurry and precipitates to form a stack. Because the PG contains various radionuclides, there are concerns that the underlying groundwater aquifer might be impaired! In an effort to assess flow and transport in a specific PG stack and its interaction with groundwater, a comprehensive investigation that included hydrological testing and flow modeling has been carried out. The aquifers tests include pressure transducer tests, various pump and recovery tests and in situ flowmeter tests to determine vertical variations of the hydraulic conductivity. The pressure transducer- and the pump tests, together with the vertical head gradients, hint of some vertical leakage from the

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