Post-Construction and Site Restoration Flashcards

What is 'permanent stabilization' in the context of post-construction erosion control?

Answer: Establishment of permanent vegetative cover or non-vegetative measures sufficient to prevent long-term erosion without ongoing maintenance

Permanent stabilization ensures that soil will be protected from erosion after construction is complete, typically through vegetation achieving at least 70% coverage per the NPDES CGP.

What is a 'seed mix' and why is it important for post-construction stabilization?

Answer: A combination of grass and other plant species selected to provide rapid cover, erosion resistance, and long-term site compatibility

Selecting appropriate seed species for local climate, soil type, and site conditions ensures successful establishment and long-term erosion control without requiring ongoing reseeding.

Which post-construction BMP is specifically designed to remove pollutants from stormwater before it discharges from a developed site?

Answer: A post-construction stormwater management facility such as a bioretention cell or wet pond

Post-construction stormwater management facilities (bioretention, extended detention basins, wet ponds) are designed to treat runoff from the completed development for the long term.

What is 'bioretention' (rain garden) as a post-construction BMP?

Answer: A shallow, vegetated depression that captures and treats stormwater through filtration, infiltration, and plant uptake

Bioretention cells use engineered soil media and native plants to filter stormwater pollutants, reduce runoff volume through infiltration, and attenuate peak flows.

What is the primary goal of restoring native vegetation on a post-construction site?

Answer: To establish a self-sustaining plant community that prevents erosion, supports biodiversity, and requires minimal long-term maintenance

Native vegetation is adapted to local climate and soils, establishing deep roots and dense canopy that provide superior erosion control, habitat value, and reduced maintenance needs.

After final grading, what is the recommended maximum time before temporary or permanent stabilization should be initiated on disturbed areas under the NPDES CGP?

Answer: 14 days after grading activity has ceased in that portion of the site

The NPDES CGP requires initiation of stabilization within 14 days after the last land-disturbing activity in any area, minimizing the window of erosion vulnerability.