When pouring concrete in a slab where you've replaced a sewer line- it's always good to drill rebar into the area you're pouring the slab in.
I love to fill the holes the rebar is in with concrete epoxy, too.
You may need to call the dig line for sewer line replacements.
Here's the link to the Dig Line-How To Manual: https://sites.google.com/burroak.capital/bocmanual/table-of-contents/plumbing-rough-in/the-dig-line
This video explains the process of replacing Orangeburg sewer pipe.
This video shows how to replace leaking cast iron pipe
This picture shows an example of an Orangeburg pipe going to sewer main at the main street
This video shows how to read your water meter to check for leaks.
Recommend that project managers check the water meter monthly on all projects with active water service.