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In the context of underground storage tanks (USTs), set-points for overfill alerts play a critical role in preventing tank overfills, which can lead to environmental contamination and safety hazards. The correct percentage for these alerts is 90% of the tank capacity.
Setting the overfill alert at this level ensures that operators receive a timely warning before the tank reaches a critical point. It allows sufficient time for corrective actions to be taken, such as ceasing product delivery or safely managing the tank's content. This threshold mitigates the risk of overfilling while also allowing for some operational flexibility in managing tank volumes.
Setting the overfill alert any higher than this could increase the risk of a spill if there is unexpected inflow or a delay in response to the alert. Excessively high alerts could also lead to operational inefficiencies, as staff may not be responsive enough to prevent an overfill situation. Thus, maintaining a set-point at or below 90% capacity is a crucial safety and regulatory measure in UST management.