CHST CHST - Construction Health and Safety Technician Excavation and Trenching Safety Questions and Answers 3

Question 1

What test method is commonly used in the field to determine soil classification for excavation safety?

Accepted Answer

Thumb penetration test

Answer

Proctor compaction test

Answer

Slump test

Answer

Permeability test

Question 2

According to OSHA, how often must a competent person inspect excavations where workers are exposed to hazards?

Accepted Answer

Daily and after every rainstorm

Answer

Once per week

Answer

Once at the start of the project

Answer

Only after a cave-in incident

Question 3

What is the primary purpose of a benching system in excavation safety?

Accepted Answer

To reduce the risk of cave-in by creating a series of horizontal steps

Answer

To provide a work platform for heavy equipment

Answer

To redirect groundwater away from the trench

Answer

To support underground utility lines

Question 4

Which of the following is NOT an acceptable method of worker egress from a trench that is 4 feet or more in depth?

Accepted Answer

Being lifted out by a backhoe bucket

Answer

Ladder placed within 25 feet of workers

Answer

Structural ramp designed by a competent person

Answer

Steps built into the side of the excavation

Question 5

What must be done before excavation begins when underground utilities may be present in the work area?

Accepted Answer

The contractor must contact utility companies or the local one-call system to locate utilities

Answer

Workers must wear rubber-soled boots

Answer

A fence must be erected around the entire work zone

Answer

All work must be performed during daylight hours only

Question 6

In an excavation where oxygen deficiency or hazardous atmospheres could exist, what must be provided to workers before entry?

Accepted Answer

Atmospheric testing and appropriate respiratory protection

Answer

Hard hats and high-visibility vests only

Answer

A written evacuation plan posted at the site entrance

Answer

Sunscreen and hydration stations