Final answer:
A small spill classification involves an area not more than 10 feet in any plane direction.
Step-by-step explanation:
The spill classification that involves an area not more than 10 feet in any plane direction is considered a small spill. Small spills are usually categorized as Class III spills. These spills are confined to a limited area and can be easily contained and cleaned up. An example of a small spill would be a fuel leak from a small vehicle, such as a lawnmower.