CHST CHST - Construction Health and Safety Technician Excavation and Trenching Safety Questions and Answers 2

Question 1

At what depth must a registered professional engineer design a protective system for a trench according to OSHA standards?

Accepted Answer

20 feet

Answer

15 feet

Answer

25 feet

Answer

10 feet

Question 2

Which soil type is considered the LEAST stable for excavation purposes under the OSHA soil classification system?

Accepted Answer

Type C

Answer

Type A

Answer

Type B

Answer

Stable rock

Question 3

How far from the edge of an excavation must spoil piles be kept according to OSHA regulations?

Accepted Answer

At least 2 feet

Answer

At least 1 foot

Answer

At least 3 feet

Answer

At least 4 feet

Question 4

What is the maximum allowable slope ratio for Type B soil in an excavation less than 20 feet deep?

Accepted Answer

1-1/2H:1V

Answer

3/4H:1V

Answer

1H:1V

Answer

2H:1V

Question 5

Which of the following conditions would require reclassifying Type A soil to a lower classification?

Accepted Answer

The soil is subject to vibration from heavy traffic

Answer

Soil is completely dry

Answer

The excavation is less than 10 feet deep

Answer

Soil has been undisturbed for over a year

Question 6

When using a trench box or shield, how far above the surrounding grade must the top of the shield extend?

Accepted Answer

At least 18 inches

Answer

The shield does not need to extend above grade

Answer

At least 6 inches

Answer

At least 12 inches