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NASCLA Commercial General Building Contractor — Practice Exam

Site construction: stormwater: practice questions

Our NASCLA Commercial GC bank has 9 questions on this topic. Here are 3 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1

Where should concrete washout water go?

  1. Into a nearby creek
  2. Into a designated, lined washout area, never into storm drains
  3. Onto bare soil anywhere on site
  4. Into the nearest storm drain, after the solids have settled out for a day
Show the answer

B. Into a designated, lined washout area, never into storm drains — Washout water is highly alkaline.

Question 2

Under the 14-day inspection option in EPA's https://www.epa.gov/system/files/documents/2025-04/2022-cgp-permit-as-modified.pdf, what storm triggers an extra inspection within 24 hours?

  1. 0.25 inches of rain or more in 24 hours
  2. Any rain at all during working hours, however light
  3. 2 inches of rain in 24 hours, or a declared flood
  4. Only a declared flood
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A. 0.25 inches of rain or more in 24 hours — Snowmelt from 3.25 inches of snow also counts.

Question 3

What is the purpose of silt fence on a construction site?

  1. To keep the public off the site and mark the property lines at the same time
  2. To stop concentrated flow from large drainage areas
  3. To trap sediment from sheet flow before it leaves the site
  4. To mark property lines
Show the answer

C. To trap sediment from sheet flow before it leaves the site — It isn't meant for concentrated flow in channels.

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