Health and safety plus risks on the site

Health and safety plus the risks on a river diversion structure and a reinforced concrete footbridge structure over the bridge. Thats include the excavation,transportation,the apparatus used ……

I would like to have concisely only the reasons of what we have to notice for safety and risks,NOT analytically.

I need to know only the health and safety and risks on the site i dont need introduction or conclusion just the reasons.