CPESC BMP Selection 5

Question 1

Which condition would make a silt fence installation INEFFECTIVE regardless of proper installation technique?

Accepted Answer

Concentrated flow channelized toward the fence

Answer

Silt fences are designed for sheet flow only; concentrated or channelized flow will overtop or undercut the fence, rendering it ineffective.

Question 2

A project near a cold-water trout stream requires extra protection. Which BMP standard is typically elevated for such sensitive receiving waters?

Accepted Answer

Sediment basin design storm (larger storm event used for sizing)

Answer

Near sensitive water bodies, sediment basins are often designed to capture runoff from larger design storms (e.g., 10-year vs. 2-year) to provide additional protection.

Question 3

Which BMP is most appropriate for stabilizing a large stockpile of excavated soil expected to remain in place for more than 14 days?

Accepted Answer

Temporary seeding and erosion control blanket

Answer

Temporary seeding with erosion control blanket provides surface stabilization for stockpiles inactive for more than 14 days, which is a common regulatory threshold.

Question 4

During BMP selection, 'redundancy' means:

Accepted Answer

Using backup BMPs so that failure of one does not result in off-site discharge

Answer

Redundancy in BMP design means layering multiple controls so that if one fails, subsequent BMPs prevent sediment from leaving the site.

Question 5

A temporary diversion dike is installed at the top of a disturbed slope. Its primary function is to:

Accepted Answer

Intercept upslope runoff and redirect it around the disturbed area

Answer

A diversion dike at the slope crest intercepts clean runoff from undisturbed upslope areas and routes it around the disturbed zone, reducing erosion potential.

(CPESC) Certified Professional in Erosion and Sediment Control Practice Test

(CPESC) Certified Professional in Erosion and Sediment Control Practice Test

CPESC BMP Selection 5