CHST Excavation and Trenching Safety 2

Question 1

Under OSHA 1926.650, what is the definition of an 'excavation'?

Accepted Answer

Any man-made cut, cavity, trench, or depression in the earth's surface formed by earth removal

Answer

Only cuts in the ground deeper than 4 feet

Answer

Any underground work area where workers are present

Answer

A trench that is at least as wide as it is deep

Question 2

Which OSHA soil classification represents the least stable, most hazardous condition for excavation work?

Accepted Answer

Type C

Answer

Type A

Answer

Type B

Answer

Stable Rock

Question 3

How far must excavated soil and materials (spoil pile) be kept from the edge of an excavation under OSHA 1926.651?

Accepted Answer

At least 2 feet from the edge

Answer

At least 3 feet from the edge

Answer

At least 5 feet from the edge

Answer

At least 4 feet from the edge

Question 4

Under OSHA 1926.651(c)(2), at what trench depth must a stairway, ladder, ramp, or other safe means of egress be provided?

Accepted Answer

4 feet or more in depth

Answer

6 feet or more in depth

Answer

5 feet or more in depth

Answer

8 feet or more in depth

Question 5

What must be done before excavation work begins near underground utilities under OSHA 1926.651(b)(3)?

Accepted Answer

Contact utility companies and use detection equipment to determine the location of underground utilities

Answer

Assume utilities are absent if no records exist

Answer

Dig slowly and stop if you hear or feel any resistance

Answer

Utilities only need to be marked if the excavation is deeper than 5 feet

Question 6

Under OSHA 1926.651(g)(1), what must be done before workers enter an excavation greater than 4 feet deep where a hazardous atmosphere may exist?

Accepted Answer

Test the atmosphere for oxygen content, flammable gases, and toxic substances before entry

Answer

Post a warning sign at the entrance

Answer

Ventilate continuously regardless of test results

Answer

Send one worker in to confirm safety before others enter