Sites with naturally occurring radioactive material residuals (elevated uranium and radium concentrations) in Croatia are the repositories of:
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ash and slag of the Plomin thermal power plant (TPP)
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ash and slag in Kaštel Sućurac
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phosphogypsum near Kutina (Petrokemija).
Until 2015 around 1.110.000 m3 of ash and slag from the operation of the two power plants were disposed at the Plomin TPP site, 900,000 m3 of which came from the Plomin 1 TPP, which used Istrian coal with high levels of uranium and radium in its operation. In Kaštel Sućurac, at the site of the old Jugovinil factory, there is a location with approximately 280.000 m3 of ash and slag, which were products of coal combustion in the factory's thermal power plant.
In 1974, 38.000 m3 of that material was disposed at an on-site repository, and the rest remains to be remediated. A phosphogypsum repository in Kutina is located some 5 km from the “Petrokemija” factory. Phosphogypsum is a white powdery material that remains as a buy-product of phosphoric acid production, and it has been disposed at this site since 1983. The repository covers a 1,6 km2 area, and the phosphogypsum total volume is around 7x106 m3.