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Generally a small tank leak, some soil, testing, reporting ect can run up to the $5,000.00 range. Costs can incrementally increase by thousands of dollars based on the increase in soil removal (contaminated soil) and replacement (clean fill). Could you spend $7000.00, $10,000.00 or more, yes, if the tank leak is big enough to require that expense.
Just as a note to all of you. If you trade in you are only getting 13 - 15lbs of propane in the 20lb tank for about 18.00 - 21.00$. It cost me 12.00 for 20lbs to have my tanks refilled. Most rental places refill tanks as well as Ace Hardware.