USCG Exam PracticePollution prevention and environmental awareness
Under 33 CFR §151.10, what is the maximum oil content of effluent, without dilution, that may be discharged overboard from machinery space bilges when a vessel is more than 12 nautical miles from the nearest land and proceeding enroute outside a special area?
- A. Less than 100 parts per million (ppm)
- ✓ Less than 15 parts per million (ppm)Correct
- C. Not more than 25 parts per million (ppm)
- D. Not more than 50 parts per million (ppm)
Why B is correct
33 CFR §151.10(a)(5) requires that the oil content of the effluent without dilution be less than 15 ppm as one of the conditions that must all be satisfied for a lawful discharge beyond 12 nautical miles. The 15 ppm threshold is the controlling standard; no other value stated in the options appears in the regulation.
Cited:33 CFR §151.10