CESSWI Erosion Control BMPs 4

Question 1

What is the purpose of a tracking control BMP such as a stabilized construction entrance?

Accepted Answer

Reduce sediment tracked onto public roads by construction vehicles

Answer

Stabilized construction entrances use aggregate to dislodge mud from vehicle tires, preventing sediment from being tracked onto public roadways.

Question 2

When is it appropriate to use a slope drain (pipe slope drain) as an erosion control BMP?

Accepted Answer

To convey concentrated runoff from the top to the bottom of a slope without causing erosion

Answer

Slope drains (pipe slope drains) safely convey concentrated runoff down steep slopes, discharging at the base with energy dissipation to prevent erosion.

Question 3

A CESSWI inspector finds that an erosion control blanket on a 2:1 slope is not stapled at the recommended density. Which immediate risk does this create?

Accepted Answer

Wind and water can lift the blanket, leaving soil exposed underneath

Answer

Insufficient stapling allows wind or water to displace the blanket from the soil surface, creating gaps where erosion can occur.

Question 4

What is the primary limitation of using straw mulch alone (without tackifier or netting) on slopes steeper than 3:1?

Accepted Answer

Straw will be displaced by wind and runoff velocity on steep slopes

Answer

On slopes steeper than 3:1, water velocity and wind forces exceed the stability of loose straw, requiring tackifier, netting, or blankets to hold mulch in place.

Question 5

Which vegetative BMP is BEST suited for stabilizing the banks of a constructed drainage channel carrying intermittent high-velocity flows?

Accepted Answer

Turf reinforcement mat (TRM) with seeding

Answer

Turf reinforcement mats provide structural reinforcement to established vegetation roots, allowing grass to withstand high-velocity flows that would otherwise erode bare or lightly vegetated banks.

(CESSWI) Certified Erosion, Sediment, and Storm Water Inspector Practice Test

(CESSWI) Certified Erosion, Sediment, and Storm Water Inspector Practice Test

CESSWI Erosion Control BMPs 4