Back fill for under slab drain line

[PrecisionPlum]

Code calls for no rocks around a drain line. Typically there is 4" of 3/4 crushed stone under a 4" residential basement
slab. As a drain line runs under a slab it passes through the stone and up through the concrete, but passing through
the stone seems to be in conflict with the plumbing code. What is the typical construction and plumbing practice.

 

[breplum]

The point of "no rocks" is to prevent damage to the pipes.
Drainage rock found typically under slabs have edges that are not good.
The best practice under the pipe is to use "base rock" which is "road base" grade of crushed rock, which has enough fine/crushed material so that it can be thumped down smooth and hard under the pipe to prevent sags (assuming you disturbed the soil underneath).
Wrap to protect pipe penetrations thru concrete (of course), or if drain rocks will come in contact.

 

[LIBERTYNY]

If your concerned with the inspection, you can contact the inspector in my area's its a eazy way to get on their good side.
Since rocks are not to code im guessing RCA (Recycle Concrete Agrate is out ?) But for iron it makes scence althow I would personally question it Plastic just has to much expansion.
Hear we have to dig to virigin ground and use block/concrete to support from their, Althow PVC only became Burial legal hear about 10-15 years ago, and earth is mostly sand.