CSLB C-27 Landscaping ContractorSite Preparation and DrainageEasy
A landscape contractor is excavating a trench for a new drainage pipe. The trench is 3 feet deep and 18 inches wide. According to Cal/OSHA regulations, what is the primary safety requirement for workers entering this trench?
- AA ladder or ramp must be present within 50 feet of workers.
- BDaily inspections of the trench must be conducted by the contractor.
- CA competent person must be designated to oversee excavation safety.
- DShoring or sloping is required to prevent trench collapse.
Show answer & explanationAnswer & explanation
Correct answer: C. A competent person must be designated to oversee excavation safety.
For any excavation, regardless of depth, a 'competent person' must be designated. This individual has the authority to immediately remove workers from unsafe conditions and is responsible for overseeing all aspects of excavation safety, including inspections and protective system requirements.
Why the other options are wrong
- A. This is a requirement for trenches 4 feet or deeper, not typically for 3-foot trenches unless other hazards exist.
- B. Daily inspections are required, but they must be conducted by a 'competent person,' making option B the more fundamental and encompassing safety requirement.
- D. Shoring or sloping is generally required for trenches 5 feet or deeper, or shallower if specific unstable soil conditions exist. A 3-foot trench in stable soil typically does not require these systems.
Cal/OSHA Competent Person (Excavation)
An individual designated by the employer who is capable of identifying existing and predictable hazards in the surroundings or working conditions which are unsanitary, hazardous, or dangerous to employees, and who has authorization to take prompt corrective measures to eliminate them.
- Required for all excavations, regardless of depth.
- Must have authority to stop work.
- Responsible for daily inspections and protective systems.
Memory trick: Competent eyes, keep workers wise.