🔍 Key Concepts

• 33 CFR Part 151 – Vessel Pollution Prevention • The definition section for “oily mixture” in the regulations • Difference between specific waste types: sludge, oily ballast, bilge slops

💭 Think About

• Ask yourself: does the regulation define "oily mixture" narrowly (one type of waste) or broadly (several types of oily wastes)? • Consider whether the term is based on where the waste comes from (bilge, ballast, fuel oil tanks) or on its oil content. • Think about MARPOL/33 CFR intent: are they trying to regulate only one kind of oily waste, or most mixtures that contain oil and water?

✅ Before You Answer

• Look up the exact definition of "oily mixture" in 33 CFR Part 151.05 (Definitions). • Check whether sludge, oily ballast water, and bilge slops each fit that definition (mixture with any oil content). • Verify if the regulation groups these under a single broad term or treats only one of them as an "oily mixture".