Question

question 1
when can machinery be close to a ditch while in it?
if the soil is stable
when an osha trained person is in the machine
never
when an osha trained person is in the ditch

Explanation:

OSHA (Occupational Safety and Health Administration) regulations prioritize safety. Machinery near a ditch poses risks like cave - ins. Even stable soil can be unpredictable. Having an OSHA - trained person in the machine or ditch doesn't eliminate all risks. The safest rule is to avoid the situation entirely.

Answer:

never