When could active containment measures be appropriate for mobile refuelers?

Active containment measures require deployment or other specific action by the owner or operator.  For discharges that occur only during manned activities, such as transfers, an active measure may be appropriate, as long as the measure can contain the volume and rate of oil, is properly constructed, and is deployed in a timely manner.

These active measures could also be applied to other situations, as deemed appropriate by a Professional Engineer (or owner/operator of a qualified facility).