The working assumption is that there is no contamination, because before a tank is certified as decommissioned, they do a leak test on it. If a pressure test fails it would trigger further contamination tests at that point.
Although, theoretically someone may screw up the leak tests or there may have been a previous leak that has not been detected.
As far as I understand passage of time also effects the contamination. Bacteria in the soil do feed off of oil and break it down. If enough time passes all oil would be broken down. The concern is of course that if not treated or re-mediated in a timely fashion oil could seep into the water table or aquifer.
Why do you suspect a soil contamination?
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