A reader sent in a question about considerations that should be taken when installing a replacement system over an existing system.
My first response would be: What do your local code or regulations specify regarding installing a new system over an existing system? I think the reader was trying to help the local code writers with info pertaining to this.My next concern would be whether this would require installing a system in fill, since the area had obviously been dug up and backfilled at least once before for the existing system's installation.
The reader mentioned the potential to pretreat the new system with
