I have a 4" cast iron sewer pipe in a concrete floor basement dating to 1910.
I can't figure out how it is configured. Here is what is visible:
The connection to the house drains is cast iron pipe about 5' long that slopes down into the concrete of the basement. It connects up to a vertical cleanout which might be part of a U or P-shaped trap, but if so it is buried in concrete below and not visible. Then nearby in the well is sloping cleanout. I cannot figure out how these might be connected because they are are at different angles.
The cast iron is 100 years old and probably should be replaced with new pipe, but I am not sure how to configure the new pipe. Should I just start jack hammering the concrete away to expose all the existing pipe so I can see where it goes?