What action should be taken if a buried oil supply line is discovered to be unprotected and still in use?

Removing the buried oil supply line from service and oil is the most prudent action because unprotected lines pose significant risks, including potential leaks, environmental contamination, and safety hazards. Over time, even the most robust materials can corrode or degrade when buried underground without adequate protection. By taking this action, you ensure that no oil is at risk of seeping into the surrounding soil or water supply, which is critical for environmental safety and compliance with regulations regarding hazardous materials.

This action not only mitigates the immediate risks associated with an unprotected line but also allows for further evaluation and potential remediation of the situation. Proper inspection and assessment can help determine whether a replacement or an alternative solution is necessary. It's vital to prioritize safety and environmental responsibility in any scenario involving oil supply lines, especially those that are buried and might not be regularly inspected.