Hello, thanks for reading. I just purchased a new home and am trying to install a new riser on my septic tank. The existing one buckled and one side slid into the opening. After digging out the existing one I noticed this pvc tube running across the top of the opening. Any ideas what it could be? See pictures. Any thoughts on what I think are my two options? 1.) Depending on what this PVC is, cut it and reroute it around the new riser. 2.) Purchase a riser base and cut it in half, trim out enough space for the PVC to run through it. Add curved braces to go over the pvc pip and hold the base together and then bolt the base to the cement tank.