Under OSHA excavation soil classification, which material is Type C?

1. Intact hard clay with unconfined compressive strength of 1.5 tsf or greater, not fissured and not previously disturbed
2. Stable rock that can be excavated with vertical sides
3. Granular soil such as gravel, sand, or loamy sand, or submerged soil from which water is freely seeping
4. Any soil a competent person prefers to call Type A to allow a steeper slope