Thanks for your comments, and yes, I should have been more specific.
The contractor wants to put a 1" water line, regular white PVC for
irrigation, buried directly into the slab... there is a LOT of pipe. I
told him he needs to sleeve it or wrap it, but that it can't be in
direct contact with concrete. He says I am crazy. Do any of you have a
code reference, or manufacturers reference, or something I can show