ASP ASP Construction Safety and Fall Protection 3

Question 1

Under OSHA 29 CFR 1926.652, what minimum trench depth requires a protective system such as sloping, shoring, or shielding?

Accepted Answer

5 feet

Answer

OSHA requires a protective system for trenches 5 feet or deeper unless the excavation is entirely in stable rock.

Question 2

What maximum slope ratio does OSHA require for a Type C soil excavation to prevent cave-in?

Accepted Answer

1½:1 (34°)

Answer

Type C soil, the least stable classification, requires a maximum slope of 1½H:1V (approximately 34°) for safe open-cut excavation.

Question 3

What is the minimum distance excavated spoil (soil) must be kept from the edge of a trench per OSHA standards?

Accepted Answer

2 feet

Answer

OSHA requires spoil piles and other materials to be kept at least 2 feet from the edge of an excavation to reduce surcharge loads that can trigger cave-ins.

Question 4

Under OSHA excavation standards, what is the maximum lateral distance a worker may be from a means of egress inside a trench 4 feet or deeper?

Accepted Answer

25 feet

Answer

OSHA requires ladders, steps, or ramps to be placed within 25 lateral feet of any worker in a trench 4 feet or deeper.

Question 5

Which OSHA soil classification has the highest unconfined compressive strength and is the most stable for excavation?

Accepted Answer

Type A

Answer

Type A is the most stable soil classification under OSHA, requiring unconfined compressive strength of 1.5 tsf or greater and no fissuring.

(ASP) Associate Safety Professional Practice Test

(ASP) Associate Safety Professional Practice Test

ASP ASP Construction Safety and Fall Protection 3