CEPSCI Construction Site BMPs and Implementation 3

Question 1

Erosion control blankets (ECBs) are primarily used to:

Accepted Answer

Protect seeded slopes from rainfall impact and erosion until vegetation is established

Answer

Block stormwater from reaching the soil

Answer

Permanently armor a channel against scour

Answer

Replace silt fences on flat terrain

Question 2

What is the minimum recommended maintenance interval for silt fences under the US NPDES CGP?

Accepted Answer

At least every 7 business days and within 24 hours after a 0.25-inch or greater storm event

Answer

Once per year

Answer

Only when visibly full of sediment

Answer

Monthly during non-rainy periods

Question 3

What is the purpose of a 'slope drain' or 'temporary slope drain pipe'?

Accepted Answer

To convey concentrated runoff down a slope without causing erosion by protecting the slope surface from flow

Answer

To supply water to construction workers on steep slopes

Answer

To drain groundwater from the slope face

Answer

To pump sediment-laden water to a treatment area

Question 4

Which of the following is an example of a 'good housekeeping' BMP on a construction site?

Accepted Answer

Properly storing and disposing of concrete washout water in a designated lined area

Answer

Installing a silt fence along a stream buffer

Answer

Installing check dams in drainage channels

Answer

Placing riprap at culvert outlets

Question 5

When is it appropriate to use polyacrylamide (PAM) as an erosion control amendment?

Accepted Answer

As a soil amendment applied to disturbed soils to reduce erosion, typically in conjunction with seeding and mulching

Answer

When no other BMPs are available and slope gradients exceed 80%

Answer

As a replacement for all physical BMPs on the site

Answer

Only in wetland areas to stabilize aquatic sediments

Question 6

What is the correct approach when a BMP is found to have failed or to be inadequate during an inspection?

Accepted Answer

Repair or replace the BMP as soon as practicable, typically within a defined timeframe required by the permit

Answer

Document the failure and wait until the next scheduled maintenance cycle

Answer

Remove the failed BMP and leave the area unprotected

Answer

Only act if the regulatory agency has been notified first