Within how many days must permanent or temporary soil stabilization be applied to bare areas after final grade is reached?

• A. Within 14 days after final grade is reached.
• B. Only after rainfall occurs.
• C. Within 7 days after final grade is reached on any portion of the site.
• D. Only when vegetation is established.

Answer: (C)

Prompt stabilization of bare soil after final grading is complete is essential to control erosion and keep sediment from leaving the site. The rule requires that permanent or temporary stabilization be implemented within seven days after final grade is reached on any portion of the site. This means as soon as you finish grading a section, you should protect that area within a week, even if other parts are still unfinished. Vegetation establishment is not a prerequisite for stabilization; you can use temporary measures like mulch, erosion-control blankets, or other cover to protect the soil, with permanent vegetation following later as part of the plan. Waiting longer, such as after rainfall or for 14 days, delays critical protection and increases the risk of erosion and sediment discharge.