All excavations must be inspected by:

The lead supervisor

That statement is false.

Explanation:

According to the regulation which created by the Occupational Safety and Health Administration (OSHA), All excavations that being done in working sites must be inspected by a competent person at the commencement of every shift.

Meaning that the person need to understand:

- the environmental layout in the working site in order to prevent things such as landslides that can trapped workers underneath the ground,

- A certain level of knowledge in Geography/Geology