We are planning ot expand out house. We are planning to expand such that the new addition will be located over a sewer line that goes from our pool house. The addition will be over a crawl space and the sewer line is below the depth for the footing. ALso, the sewer line would enter almost perpendicular to a wall and exit almost perpendicular to the opposite wall. We are located in the San Francisco Bay Area.
1. Is it OK to build over the existing sewer line PVC), or should I relocate it to go outside the addition?