I have a rough idea of what it costs to have an underground oil tank from a residential property when it is not leaking and there are no complications. I also hear horror stories of it sometimes costing many thousands of dollars when the tank was found to have leaked (stories like 50K, 75K, or even more). I know that it costs a lot more when a leaking tank is near a house or structure that needs to be jacked up or supported so contaminated dirt can be excavated from underneath and around the structure.
My real question is, if an underground oil tank on a residential property needs to be removed, and it is found to have been leaking, -- and it is NOT near any structures and is out in the open -- is the cost of removal more or less self-limiting? In other words, is it mostly the cost of removing the tank and removing and disposing of the contaminated dirt around it, and then refilling the hole with clean soil? If so, would a situation like that tend NOT to cost in the 10's of thousands of dollars, and be more like under 10K to get the job done?