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Obligatory XKCD chart for understanding the radiation amounts in the article

100 mrem == 1mSv

Thinking about the article... for those who understand the risks of increased background radiation, I bet for these businesses rent is cheap!

How many inches of lead on the ground is considered safe?

How much lead is seeping into the groundwater from this location?

That's why they wrap it in a steel sandwich -- to protect the lead, not principally for radiation protection.

I can understand why the lead on the streets of New York needs to be wrapped in 2 inches of steel for protection: otherwise it would be stolen.