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Trenching and Excavation is a very dangerous activity. Every company involved in trenching and excavation must have a designated competent person assigned who conducts daily inspections of your site. Although the competent person is responsible for your employees, everyone entering into the trench / excavation should be trained and have at least rudimentary knowledge of the requirements. Provided are several key numbers everyone needs to know and live by:
· Call before you dig to have underground utilities located. Call #811 several days before digging
· The competent person must conduct inspections prior to entry and changing conditions
· The competent person must conduct soil tests (1 visual, 1 manual) to classify the type of soil.
· 2 feet
o The distance the spoil pile, tools and objects must be kept away from the edge
o The distance that walkways must extent past both sides of a trench
o The maximum height a trench shield can be from the bottom of the trench
· 3 feet – The distance that a ladder must extend above the top of a trench/excavation
· 4 feet
o The depth when ladders or other systems must be used to enter/exit the dig
o The depth where atmospheric testing is required to be conducted before entering
· 5 feet – The depth that shoring, sloping, or benching is required to be used to protect workers
· 6 feet – The depth that construction fall protection is required i.e. walkways, guardrails
· 10 feet – The minimum distance that equipment must operate from overhead electrical lines
· 15 feet – Maximum width at the base to be defined as a trench, greater makes it an excavation
· 20 feet – Maximum depth protective systems can be used without an engineer’s design/plan
· 25 feet – Maximum lateral distance for any employee to have access to a ladder/egress point
By remembering these numbers, you can do your part to ensure everyone makes it home safely.
For more information on guidelines for Trenching and Excavation, or other construction safety questions or concerns, please contact PGM Safety Services, an affiliate company of Pro Group Management. We will be happy to assist when you visit us at www.pgmnv.com or call (800) 859-3177.
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