The Occupational Safety and Health Administration has a few rules you should to be aware of:
Banks over 4 feet must be shored
Trenches deeper than 4 feet and longer than 8 feet must be shored
Shoring slope cannot exceed 1:2 (H:V)
Bell bottom trenches (wider at the bottom) must have bracing on the thin part to prevent cave-in. Workers entering these should wear a life-line.
Ladders must be provided at 25 feet intervals for all trenches deeper than 3 feet.
Toilets must be provided at the site.
< 20 1
>20 1 toilet and 1 urinal for every 40 workers
>200 1 toilet and 1 urinal for every 50 workers
The Prime contractor assumes all obligations. If the work has been subcontracted they may share obligations with the sub-contractor.
Employer must have an emergency action plan for evacuation
First aid supplies are required
Incident rate = number of injuries (annual) / number of annual hours * 200,000
Employees must be protected form high sound levels
Employees must be protected from extreme light intensities
Proper signs must be placed.
The Critical Fall height is 6 feet. Anything over this height must have guardrails or other protective measures taken. Guardrails must be 42 inches.
While construction masonry walls a limited access zone must be set up adjacent to the wall. The size of it needs to be the wall height plus four feet. Only employees constructing the wall can enter it.
Construction sites need to have adequate access to roads around the site to ensure safe transportation of construction equipment and materials. Pedestrian and vehicle access in nearby roads must be maintained and controlled.
The site must be firm, properly drained and dry, and have adequate space to perform the work, operate equipment etc, and be large enough to store needed materials.