Question

what must an employer do before you start working in a 10 - foot - deep trench? determine that you are only digging into type a soil or solid rock. call a structural engineer to design the trench. slope, shore, or brace the trench walls. assign a spotter to monitor signs of trench collapse.

Explanation:

In construction - related work, especially for deep trenches like 10 - foot - deep ones, to ensure worker safety, the trench walls need to be stabilized to prevent collapse. Sloping, shoring, or bracing the trench walls is a key safety measure. Just determining soil type (Type A soil or solid rock) is not sufficient for safety. Calling a structural engineer to design the trench might be part of a larger project but is not the most immediate pre - work requirement. Assigning a spotter is also important but comes after ensuring the physical stability of the trench walls.

Answer:

Slope, shore, or brace the trench walls.