It's about as bad as the replacement of single-walled tanks with double-walled was. Easier, because the double-walled tanks probably aren't leaking. When you se

It's about as bad as the replacement of single-walled tanks with double-walled was. Easier, because the double-walled tanks probably aren't leaking. When you see a gas station with a little fenced-off area and a tiny building with warning signs, that's usually because there was a leaky tank there and the slow cleanup process is underway. Gas stations are all about location. There will probably be a business in doing a turnkey conversion. Prepare to bring in heavy power, shut down gas station, remove pumps, remove tanks, clean up and repair convenience store, put in chargers on the islands, replace signage, power up.