Certified Storm Water Operator Practice Exam

In what scenario is a Part 91 permit not required?

1. Disturbing less than one acre of land

2. Working more than 500 feet from water

3. Conducting maintenance on existing structures

4. Changing landscaping within private properties

The correct answer is: Disturbing less than one acre of land

A Part 91 permit, which falls under the state’s water quality regulations, is not required when disturbing less than one acre of land. This is significant because many regulatory frameworks establish thresholds for permitting based on the area of land disturbed, with the idea being that smaller disturbances have a lesser potential to impact water quality. Disturbing less than one acre typically falls below the permit threshold, leading to the exemption from a Part 91 permit. In contrast, scenarios like working more than 500 feet from water or conducting maintenance on existing structures may still involve activities that could impact water resources, especially if erosion or runoff is a factor. Similarly, changing landscaping within private properties might also require oversight depending on the potential for runoff or the introduction of pollutants, regardless of the specific area being disturbed. These activities could trigger the need for management practices or permits to ensure that water quality is protected.