🔍 Key Concepts

• 46 CFR Subchapter D requirements for barges carrying hazardous materials like propylene oxide • Special precautions for toxic/flammable cargoes in fleets or moorings • Difference between mooring arrangement vs personnel/watch requirements when leaving a barge in a fleet

💭 Think About

• Which choice directly addresses the hazard characteristics of propylene oxide (highly flammable/ reactive) and how it should be positioned around other barges? • When a dangerous cargo barge is left in a fleet, is the primary concern watchstanding, internal tank/void condition, or its location relative to other traffic and potential collision? • Think about what a collision could cause with this type of cargo, and how fleet arrangement can reduce the chance or severity of an impact.

✅ Before You Answer

• Verify which option focuses on protecting the dangerous cargo barge from collision or damage in a fleet situation • Check whether any answer choices mention a requirement clearly tied to fleet positioning of hazardous cargo barges, not just good seamanship in general • Ask yourself: if a towboat struck the fleet, which arrangement would best shield the propylene oxide barge from direct impact?