OSHA 10-Hour Construction ReviewFocus Four HazardsEasy
A trench is being excavated for a new water line. The trench is 5 feet deep and 3 feet wide. According to OSHA standards, what is the minimum distance that excavated material (spoil pile) must be kept from the edge of the trench?
- AAt least 3 feet
- BAt least 4 feet
- CAt least 2 feet
- DAt least 1 foot
Show answer & explanationAnswer & explanation
Correct answer: C. At least 2 feet
OSHA requires that spoil piles and other materials be kept at least 2 feet (0.61 meters) from the edge of an excavation. This prevents the material from falling back into the trench, and also reduces the load on the trench wall, which could lead to a collapse.
Why the other options are wrong
- A. 3 feet is more than required but not the minimum, and may not always be practical.
- B. 4 feet is also more than required, and often impractical on a job site.
- D. 1 foot is insufficient and does not meet OSHA's minimum requirement.
Excavation Spoil Pile Distance
Excavated material (spoil pile) must be kept a minimum distance from the edge of a trench or excavation to prevent material from falling in and to reduce pressure on the trench walls.
- Minimum distance is 2 feet (0.61 meters).
- Helps prevent 'struck-by' incidents from falling debris.
- Reduces the load that could cause trench wall collapse.
Memory trick: Two feet back, or you'll get smacked!