Where should connections to an underground tank be made?

Connections to an underground tank should be made at the top of the tank. This is primarily due to safety and operational effectiveness. Making connections at the top allows for easier access for maintenance and inspection and helps prevent potential leaks since the connections are less likely to be submerged in fuel. Additionally, top connections facilitate proper venting and are more effective for gravity feed systems, ensuring that the liquid can flow into the supply line efficiently.

In the context of the other options, the bottom connections may pose risks of contamination or leaks if not properly sealed, while side connections can create complications related to sediment buildup and are often more challenging to service. Adjacent connections could lead to misunderstandings regarding the fuel delivery and management system because they might imply a different setup that does not correspond to standard practices for safety and efficiency.