Sewer line replacement options?
I've gotten some great info over in the HVAC forum, so now it's time to confront my sewer demons.
I'm currently under contract to buy a gutted (down to the studs) home in New Orleans, with the intention of rebuilding it and moving in over the next few months. I had the sewer line scoped last week and found major issues, now trying to identify my options to determine whether I can close the sale.
The house is one story, monolithic slab foundation. Generally, there is a kitchen on the right exterior wall and two bathrooms on the left exterior wall. The existing sewer line runs from the kitchen across the width of the house to a main line, which runs from the back bath straight forward to the street. We've found 2 breaks on the main line: one above the junction with the kitchen line and one below. The kitchen line is also obstructed about 15 feet from the drain by debris from demolition after Katrina. That leaves about 1/2 of the line that we can't get to with a scope (between the two breaks and the obstruction).
I've gotten three suggestions:
1) Tunnel underneath the house along both lines replacing all sewer lines with PVC. This would require one tunnel that would almost completely cut the house in half from front to back, then a second to come up the center of the house and replace the main line.
2) Run new lines up each side of the house to provide sewer access to kitchen and both baths... requires demo and replacement of driveway and tunneling to existing drain locations to tie in. I've been told (without explanation) that this solution (which was mine) isn't feasible.
3) Cut channels through slab w/ concrete saw to lay new sewer line from front of house (where current line is intact) to baths and kitcen (essentially carving a V into the slab).
Needless to say, the thought of cutting the slab into three sections and then patching it makes me EXTREMELY nervous, but two contractors have told me it's nothing to worry about.
Can anybody with any experience in this offer thoughts or suggestions? I can provide add'l details if necessary.