Channel 12: Norwood officials working on funds for a salt dome

In another story about the shortage of salt in the Tri-State, Channel 12 is reporting that unnamed “Norwood officials say they can't pre-order order extra salt because Norwood doesn't have the space to store it. Norwood officials say so far, they've been able to make do…Norwood says it is working on funds to build a salt dome. That way the city will have the space to store a lot more during the winter.”

Question: What's the best location to build a salt dome?