The problem is I am not sure what is the best way to cut these roots there are two pieces about 2" in diameter so it's pretty thick. I tried using a recipicating saw but the angle is such that it's real difficult and the blade would strike the pipe when fully extended.
I tried a handsaw and same problem could not extend back and forth without striking the pipe or other parts of the roots. About the only thing I think would work would be a mini-hack saw but that will not go far with that size root.
I do have a 4.5" angle grinder but I only have metal or masonry blades, no wood blades and I don't think they make one. Could a grinder with metal blade work in this case? It seems that it should.