Questions on plumbing code for pvc pipe under concrete floor

I read the plumbing code:
https://law.resource.org/pub/us/code…c.ipc.2003.pdf
and it does not mention what is the minimum depth the 2″ pvc pipe has to be under the concrete slab?
For inspection, do i put the sand under the pipe so that it is resting on the sand?


Questions on plumbing code for pvc pipe under concrete floor