My tanks are next to my driveshed, and so far they have said nothing. A few years ago, they insisted that my tanks be on reinforced concrete. Patio style stones were OK. Once I had a piece of pressure treated lumber under one set of legs to get the diesel in an almost empty tank down to one side. The driver didn't like that and removed it!
I can understand the merits of a double wall tank but can't for the life of me understand the concrete containment system on some tanks. What is one to do with the contaminated water?
I am probably coming really close to getting a truck mounted fuel tank, fill up at best prices and store the **** stuff any way I see fit, using common sense of course! That would even give me 30 days to pay on my credit card and I get points! And no, I don't have any insurance because we told those guys to go screw themselves a very long time ago! lol