Including materials from OSHA and the UK HSE – good stuff:
Click links for documents:
On the videos – start the video briefly, stop it, then look in the left hand corner for an arrow – click on this and there will be an option to download.
A Guide to the OSHA Excavations Standard
Excavation – What you need to know as a busy builder
Preventing Accidents In Excavations
Trench Safety – QuickCard