OS Environmental Standards 5 — Questions and Answers
Question 1: Ballast water exchange by the sequential method must replace at least what percentage of the ballast water by volume?
- 50%
- 75%
- 90%
- 95% (Correct answer)
Correct answer: 95%
The D-1 standard requires at least 95% volumetric exchange.
Question 2: When ballast is exchanged by the flow-through (pumping-through) method, how many times the tank volume must be pumped through?
- One time
- Two times
- Three times (Correct answer)
- Five times
Correct answer: Three times
Pumping through three times the tank volume is treated as meeting the 95% exchange standard.
Question 3: Which of these is in a MARPOL special area, where garbage and oil discharge rules are stricter?
- Gulf of Alaska
- Mediterranean Sea (Correct answer)
- Coral Sea
- Sea of Japan
Correct answer: Mediterranean Sea
The Mediterranean is a MARPOL special area, as are the Baltic, Black Sea, Red Sea, Gulfs area and Wider Caribbean.
Question 4: Under the revised MARPOL Annex V, what is the rule for discharging dunnage, lining and packing materials that float?
- Allowed beyond 25 nm from land
- Allowed beyond 12 nm from land
- Allowed beyond 3 nm if comminuted
- Prohibited at sea (Correct answer)
Correct answer: Prohibited at sea
Since 2013, Annex V has prohibited discharge of all garbage, including dunnage, except a few listed exceptions such as food waste.
Question 5: Which MARPOL annex regulates noxious liquid substances carried in bulk, such as chemicals in chemical tankers?
- Annex I
- Annex II (Correct answer)
- Annex III
- Annex V
Correct answer: Annex II
Annex II covers the control of pollution by noxious liquid substances carried in bulk.
Question 6: Which MARPOL annex covers harmful substances carried in packaged form?
- Annex II
- Annex III (Correct answer)
- Annex IV
- Annex VI
Correct answer: Annex III
Annex III deals with harmful substances in packaged form, which are linked to the IMDG Code.
Question 7: Under U.S. regulations, which vessels must have a written waste management plan?
- All vessels over 16 feet
- Manned oceangoing vessels 40 feet or more with a galley and berthing (Correct answer)
- Only cargo ships over 400 GT
- Only passenger vessels
Correct answer: Manned oceangoing vessels 40 feet or more with a galley and berthing
33 CFR 151.57 requires a waste management plan on manned oceangoing U.S. vessels 40 feet or more that have a galley and berthing.
OS Environmental Standards 5
Ballast water exchange by the sequential method must replace at least what percentage of the ballast water by volume?