There are a few different methods that can be used to locate a sewer line under a finished slab. One method that may be effective is to use a pipe locator device, which can help to determine the general location of the sewer line. To use this method, you will need to have access to a pipe locator device, which can be rented or purchased from a plumbing supply store.

Paulk Workbench Plans: https://thesmartwoodshop.com/ronsstore