When should land not be used for combustible storage?

The appropriate reason for not using land for combustible storage when there is a risk of an underground fire is grounded in safety considerations. Underground fires can be particularly hazardous as they may not be readily detectable and can lead to severe consequences like smoke inhalation and potential explosions. Storing combustible materials in such an area increases the risk of these materials igniting from the heat or flames generated by an underground fire, thereby putting lives and property at great risk.

When it comes to options like proximity to buildings, designated parking areas, or frequent access by personnel, while these factors do raise safety and operational concerns, they do not carry the same immediate risk factor as the possibility of an underground fire. Proximity to buildings may call for certain precautions, designated areas might be contingent on site plans, and accessibility considerations are relevant for operational efficiency, but the presence of an underground fire represents a critical and often uncontrollable hazard, making it a more pressing reason to avoid using land for combustible storage in such situations.