Several days ago there was a discussion on another thread about this subject and a poster named Greg Grimes mentioned filling in the old system by a process called "high pressure grouting". He said it had to be done correctly to prevent leaks. I am looking for more details about how this process is done. If Greg is around maybe he can help give us the details and how to find a company that does it correctly. I have thought about filling in with concrete but at this point do not know if that is the proper/best way to do it. All responses are greatly appreciated.

OldBob