Has anyone here ever had this done or know someone that has? Can you give me a ball park figure on how much it cost you/them and why? There is no leak (at least none known).
KitKat70-I can't help you with the insurance questions, however let me suggest that you check with your home heating oil provider.
Regulations vary from county to county here in good ol' SOMD. Some counties will allow homeowners to have the tank pumped out and then filled with pea gravel. This will negate the need to have your yard excavated and the cost of tank disposal.
If you still want the tank removed you'll need to know the size of the tank (larger tank=more digging), is the area where the tank is located easily accessable and are you near any any streams or wells?
If you do decide to replace the underground tank with either a basement or above ground type, you should be able to have what oil remains transferred to the new tank unless there is water or a sludge build up in your present tank.
Additionally-how old is your tank and have your neighbors experienced problems with tank leaks? If you are in a subdivision where underground oil tanks were installed during the same construction period, tanks installed in adjacent homes historically start failing around the same time (within a couple of years) due to soil conditions.
Best bet-check with your oil provider before doing anything, some will offer discounts or loyalty credits if they do the work for you and
should be knowledgeable of the laws and regulations in the areas they serve.