Which of the following may indicate the presence of an abandoned buried fuel oil storage tank?

The presence of an abandoned buried fuel oil storage tank can be suggested by several indicators, with one of the most relevant being related to the physical signs associated with the heating system in the area. In this case, small diameter copper tubes emerging from the foundation wall are typically used in residential heating oil systems. However, they do not provide definitive evidence of an abandoned tank.

The approximately 1-inch diameter vent pipe located outside is a strong clue often associated with heating systems that used oil tanks. This vent pipe, typically related to the oil tank's ventilation system, would indeed indicate the previous presence of an oil tank, especially if it is no longer in use.

Deteriorated mortar joints in the brick chimney, on the other hand, generally relate to chimney wear or structural issues but do not specifically imply the existence of a fuel oil tank. While poor chimney condition could suggest neglect in maintenance, it does not correlate strongly with the presence of a buried tank.

Knowledge of the neighborhood's heating methods can be informative, as it provides context on whether homes commonly used oil for heating. However, this knowledge alone does not serve as a direct physical indicator of an abandoned tank like the vent pipe would.

In summary, the presence of specific ventilation or piping related