CESSWI Erosion Control BMPs 2

Question 1

Which factor most directly determines the appropriate spacing of contour wattles on a slope?

Accepted Answer

Slope steepness and wattle diameter

Answer

Spacing of contour wattles is primarily determined by slope steepness and wattle diameter, with steeper slopes requiring closer spacing.

Question 2

A hydroseeding operation fails to establish vegetative cover within the specified timeframe. What is the FIRST corrective action an inspector should require?

Accepted Answer

Reapply hydraulic mulch and seed to bare areas

Answer

Reapplying hydraulic mulch and seed to bare areas addresses the establishment failure directly and maintains the erosion control intent.

Question 3

What minimum ground cover percentage is typically required before temporary erosion controls can be removed from a stabilized slope?

Accepted Answer

85%

Answer

Most regulatory standards, including NPDES Construction General Permits, require 70–80% vegetative cover; 85% is the typical conservative threshold for final stabilization.

Question 4

Crimped straw mulch without tackifier is MOST effective when used in which situation?

Accepted Answer

Flat to gently sloping areas with wind protection

Answer

Crimped straw mulch without tackifier is best suited for flat to gently sloping areas where wind and slope forces won't dislodge it.

Question 5

Which erosion control BMP provides both sediment filtering and slope stability reinforcement simultaneously?

Accepted Answer

Erosion control blanket (ECB)

Answer

Erosion control blankets protect the soil surface from raindrop impact and runoff while also reinforcing slope stability as vegetation establishes.

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

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

CESSWI Erosion Control BMPs 2