The key to safe excavations between 5 and 20 feet deep is that the work be supervised closely by a trained, competent person. (Trenches 20 feet or deeper require a safety system devised by a ...
Excavation and trenching are considered two of the most dangerous construction operations by the Occupational Health and Safety Administration, and the governmental agency cites numerous contractors ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback