A reader sent in a question about considerations that should be taken when installing a replacement system over an existing system.
The first response should be identifying what local code or regulations specify when 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.The next concern would be whether the system will be installed in a 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
