What is required when 10 acres or more are disturbed during construction?

When 10 acres or more are disturbed during construction, the installation of a sediment/retention pond is required. This requirement arises from the need to manage and control stormwater runoff and sedimentation, which can significantly impact the environment.

A sediment/retention pond serves as a critical stormwater management tool that captures sediment-laden runoff from the disturbed area. This allows sediments to settle out of the water before it is released into nearby streams, rivers, or other bodies of water, thereby protecting water quality and preventing erosion and further sedimentation downstream. These ponds are designed to hold water temporarily, reducing peak flow and providing a means of treating the water to allow for pollutants to settle out.

The other options, while they have their own uses in construction and environmental management, do not fulfill the same critical role as a sediment/retention pond when large areas are disturbed. Temporary fencing can help limit access and protect sensitive areas, drainage ditches manage water movement on site, and erosion blankets serve to stabilize bare soil and prevent surface erosion. However, for the specific requirement related to large-scale land disturbance, sediment/retention ponds are essential for effective stormwater management and compliance with environmental regulations.