We pump brine inland to a large flat expendabe plain and flood it to allow the water to evaporate off and the salt to sette. 20-50 years later, pod racing on the salt flat.
Is it just a case of the scale making it safe?
0: https://www.timeout.com/croatia/things-to-do/ston-salt-works
The brine slowly go down through geological layers. After 5 years it reaches groundwater reservoir.
20-50 years later, the regions become famous for its fun pod racing and for its numerous ghost cities around the old plain.