If your asphalt barge has operated more than 12 months in saltwater in the 24 month period since it was last dry-docked, when is it required to be hauled out again?

Correct Answer: Option D — 36 months since last dry-docking

Under 46 CFR Table 31.10-21(a), non-self-propelled vessels carrying certain cargoes like asphalt operating extensively in saltwater (more than 12 months out of the 24-month period since the last dry-docking) require a more frequent mandatory dry-dock interval, specifically every 36 months.