Underground storage tank (for oil, fuel) in Indianapolis

[Orr Kichin]

Hey there,

I've made an offer on  property from 1959 and it was accepted.

Now I realize  there is an underground storage tank- that was used either for oil or fuel, and I don't know what to do.

I understood from my agent , that it must be filled with gravel/earth (if it's not filled already) and then it is not a problem.

But , I'm still worried - what can be the outcome of buying a house for buy&hold with this tank?

What is the best way to handle this issue?

Should I even purchase it- or is it bad news from the start? 

Thanks for any help!