Hi Neal. Thank you for your response! Now we know why the hole is there. It sounds like moving the shower pan can be quite the process if we aren't careful. I'll take your suggestion and phone the City. As I said before we are worried about radon levels but at the same time if the hole is...
I'm not sure if I have enough information for anyone to help; but here goes. We removed the drywall on the outside wall of the basement corner shower (pipes leaked but are now fixed). After we removed the drywall we were able to see under the corner shower. The base is about 4 inches high and...