Digging holes in 1972

From Have a safe day: A handbook for safe living (1972. Published by 3 organisations inc Workmen’s Compensation Board of BC !)

P9 Excavations. (part 1)

When a man works in an unsafe excavation he may be digging his own grave.

Every ditch more than four feet deep must be shored or flared. Excavation and shoring must be done at the same pace.

Be careful when digging in wet soil, sandy soil or clay. Vibrations, even from passing traffic, can bring the walls tumbling down. Exit ladders should be in every trench and they must extend three feet above the ground level.

Proper crosswalks should be built over trenches. men should never jump across.

Excavations must be barricaded and well marked to prevent persons from falling in.