A client had a question about an underground oil tank (yes, I strongly advised her to have it removed). The house is occupied by tenants who have not used the oil fired boiler for an unknown period (every question I asked the tenant, she refused to answer) but instead have portable electric heaters. During my inspection, the boiler could not be fired for lack of oil. Since the tank is empty, is it possible condensation is present and it could accelerate the deterioration of the tank? The tank was tested in October, but now she's asking if it should be re-tested.