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ABS is very tough. Football helmets are made from ABS. There's no minimum distance below the slab. 1/4" per foot pitch is code complaint.
Looks like the pipe will be in the slab pour judging from what I can see in the pics. You need to protect the pipe if it's in the pour and you also need to protect the pipe from stones coming in contact with it. Looks like you're doing that in some of the pics. You can also use washed sand to back fill the trench to protect the pipe.
Do you have any more questions?
The rule for PVC is 1' in all directions. ABS is tougher pipe and it looks like you only have small stones in the trench so 6" should be enough.
I'd appreciate a favorable rating