CPESC Construction Site Controls 3

Question 1

Which type of check dam material is most appropriate for installation in a high-velocity channel where rock is locally available?

Accepted Answer

Rock riprap check dam

Answer

Rock riprap check dams are durable and resistant to scour in high-velocity flows, making them the preferred choice when local rock is available.

Question 2

Under the NPDES Construction General Permit, how frequently must a qualified person inspect a construction site's BMPs?

Accepted Answer

At least every 14 days and within 24 hours after a 0.5-inch or greater rainfall event

Answer

The EPA's Construction General Permit requires inspections at least every 14 days and within 24 hours after any storm event of 0.5 inches or more.

Question 3

What is the main function of an outlet protection apron at a pipe culvert discharge?

Accepted Answer

To dissipate the energy of concentrated flow and prevent scour at the pipe outlet

Answer

Outlet protection aprons, typically made of rock riprap or concrete, absorb and dissipate the kinetic energy of pipe discharge to prevent channel erosion.

Question 4

A SWPPP requires that all areas of land disturbance be stabilized within 14 days of final grading. Which of the following does NOT meet this requirement?

Accepted Answer

Rough grading the surface to a 2:1 slope and leaving bare

Answer

Leaving bare, rough-graded soil without any stabilization measure does not meet the 14-day stabilization requirement under most NPDES permits.

Question 5

Which sediment control BMP is best suited for capturing sediment-laden runoff from a large disturbed area before it discharges off-site?

Accepted Answer

Sediment basin

Answer

Sediment basins are designed to handle large drainage areas and provide sufficient retention time for sediment particles to settle before discharge.

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

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

CPESC Construction Site Controls 3