Here's some pictures of the work done from last night, in an imgur album:
They had to jack hammer through my floor and concrete to get to the piping to replace it.
They said that they're going to pour 6 inches of concrete to ensure that it's reinforced and sturdy when they pour concrete. Currently have 4 inches there.
They pulled permits and are working with the county inspector as well.
Anything else I should know? Will the pvc and Pex be safe under the concrete like that? I live in Ohio, it gets pretty cold. Don't want it to crack or burst.