Which statement correctly defines the MAJOR class of oil spills?

Which statement correctly defines the MAJOR class of oil spills?

• A. Inland spills over 100,000 gallons.
• B. Coastal spills over 10,000 gallons.
• C. Inland spills over 1,000 gallons.
• D. More than 10,000 gallons inland or more than 100,000 gallons coastal.

Answer: (D)

The major class is defined by location and amount spilled: inland spills become major when they exceed 10,000 gallons, while coastal spills become major when they exceed 100,000 gallons. This dual threshold mirrors how the potential impact and the complexity of response differ by environment. Inland water bodies can be more sensitive to smaller volumes, so a lower threshold triggers a higher level of response, whereas coastal and nearshore areas involve larger scales and more complex operations, requiring a much larger volume before classifying a spill as major. The other options don’t align with these established thresholds, which is why this dual, location-based definition is the correct one.

The major class is defined by location and amount spilled: inland spills become major when they exceed 10,000 gallons, while coastal spills become major when they exceed 100,000 gallons. This dual threshold mirrors how the potential impact and the complexity of response differ by environment. Inland water bodies can be more sensitive to smaller volumes, so a lower threshold triggers a higher level of response, whereas coastal and nearshore areas involve larger scales and more complex operations, requiring a much larger volume before classifying a spill as major. The other options don’t align with these established thresholds, which is why this dual, location-based definition is the correct one.