🔍 Key Concepts

• 33 CFR pollution prevention requirements for machinery space wastes • Differences between oily mixtures discharged to bilges vs. contained/controlled systems • What types of drains create a direct overboard pollution risk

💭 Think About

• Which option sends oily waste to a place that is most likely to end up overboard with minimal control or treatment? • Which systems are normally designed to collect and control oil (tanks, drip pans, etc.) versus places where oil should NOT be routinely drained? • Think about the intent of the rules: which practice would the Coast Guard be most concerned about because it makes accidental discharge easiest?

✅ Before You Answer

• Identify which choice involves draining directly or indirectly into the bilge (high pollution risk area) • Distinguish between systems that are part of a controlled oily-waste management system (like a slop tank) and uncontrolled areas • Verify in 33 CFR 155 which kinds of discharges or connections are specifically restricted from leading to bilges or overboard