Within how many days must vegetation be established after final grade of a site?

The correct timeframe for establishing vegetation after the final grading of a site is within 7 days. This requirement is key in stormwater management practices, as it helps to prevent soil erosion and sedimentation, which can adversely affect water quality. By establishing vegetation quickly, the root systems can help stabilize the soil, reducing the possibility of runoff and sediment transport into waterways.

The regulation is designed to minimize the time that bare soil is exposed to the elements, which is when erosion risks are highest. During this critical period, the vegetation can start to take root and provide the necessary cover to protect the soil. This prompt action is essential for both environmental protection and compliance with local regulations, assisting communities in managing stormwater effectively.