CSOC Excavation and Earthwork Safety

Question 1

What is the main danger of excavation work on Singapore construction sites?

Accepted Answer

Collapse of excavation walls (cave-in), which can trap and kill workers

Answer

Noise pollution only

Answer

Damage to tools only

Answer

Aesthetic impact on the neighbourhood

Question 2

At what depth must shoring or other protective measures be used for excavations in Singapore?

Accepted Answer

Excavations deeper than 1.5 metres require earth retaining or stabilising structures unless the sides are sloped to a safe angle

Answer

Any depth over 5 metres

Answer

Only excavations over 10 metres deep

Answer

Protective measures are never required

Question 3

What must be done before starting any excavation work on a Singapore construction site?

Accepted Answer

Locate underground services (utilities), conduct soil assessment, prepare a safe work plan, and obtain necessary permits

Answer

Nothing special is needed

Answer

Only inform neighbouring buildings

Answer

Only check the weather forecast

Question 4

What access and egress requirements apply to excavations on Singapore construction sites?

Accepted Answer

Safe means of entry and exit (ladders, ramps, steps) must be provided within 7.5 metres of any worker in the excavation

Answer

Workers can climb the soil walls

Answer

Only a rope is needed

Answer

Access is only needed at one end

Question 5

How should spoil (excavated earth) be stored on Singapore construction sites?

Accepted Answer

At least 1 metre away from the edge of the excavation to prevent surcharge loading and material falling back in

Answer

Against the edge of the excavation

Answer

On top of the shoring system

Answer

Anywhere on site

Question 6

What inspection requirements apply to excavations on Singapore construction sites?

Accepted Answer

A competent person must inspect the excavation daily, after rain, and after any event that could affect stability

Answer

Inspections are not required

Answer

Only inspect once at the start

Answer

Only inspect when workers report problems