Three years ago I had my house's septic tank replaced, and the guys put in new cleanouts because they couldn't find the original ones. Well, by chance I just found them: buried under about 6" of dirt and rocks about two feet away from the house.
What should I do with them? Abandon them because there are now new cleanouts? Or add some PVC risers to make them accessible at grade level? And if so, how should I make the connection between the old cast iron pipe to a new 3" PVC pipe? A no-hub coupler wouldn't work since the exposed cast iron pipe is flanged.