Don’t be fooled by the ‘approved’ and ‘certified’ method of abandoning and filling of a UST. Yes, it is acceptable by some local codes. Does this mean the buyer/seller is protected with out tests proving that a leak or discharge of gasoline or oil did not occur? No, it does not. The ‘certification’ of cleaning and filling of a UST means ONLY that, and nothing else. This ‘certification’ has almost nothing to do whether a leak occurred from the UST and has no association with soil and/or groundwater testing. Laboratory analysis of properly collected soil and/or groundwater samples and assessment is the answer as to whether a leak or spill is from the UST, or oil supplier. The leak and spread of the petroleum is the important issue and liability; not that the UST was just wiped clean.