CEPSCI Construction Site BMPs and Implementation 2

Question 1

What is the primary purpose of inlet protection (e.g., a filter sock or gravel bag around a storm drain inlet)?

Accepted Answer

To prevent sediment-laden runoff from entering the storm drain system

Answer

To increase the capacity of the storm drain

Answer

To mark the inlet location for the contractor

Answer

To aerate the water before it enters the drain

Question 2

A compost sock (bio-roll) used for erosion control is most appropriately installed:

Accepted Answer

Along the contour of slopes to intercept sheet flow and filter sediment

Answer

At the top of slopes to divert water

Answer

Inside storm drain pipes

Answer

Vertically on steep embankments

Question 3

What is a 'diversion' BMP and what is its primary function?

Accepted Answer

A constructed channel or berm that intercepts and redirects runoff to a safe outlet or treatment area

Answer

A device that filters sediment from runoff

Answer

A chemical treatment for stormwater

Answer

A type of inlet protection device

Question 4

Which temporary stabilization method is most appropriate for areas that will be reactivated within 2 weeks?

Accepted Answer

Temporary mulching with straw or hydraulic mulch

Answer

Permanent seeding and fertilization

Answer

Concrete paving

Answer

Installation of riprap armoring

Question 5

A turbidity curtain (silt curtain) is used to:

Accepted Answer

Contain sediment in open water bodies such as rivers, lakes, or bays during in-water work

Answer

Control erosion on steep slopes

Answer

Filter inlet runoff on land

Answer

Divert stormwater around a work site

Question 6

What is the purpose of a 'rock outlet protection' or 'riprap apron' at the end of a culvert or pipe?

Accepted Answer

To dissipate the energy of high-velocity discharge and prevent scour of the receiving channel

Answer

To filter sediment from pipe discharge

Answer

To increase flow velocity through the culvert

Answer

To prevent animals from entering the pipe