My house was connected to the city sewer about 10 years ago (I bought it last year from an estate). In the basement there still is a stub from the old soil stack and a vent line connected to the new vent stack. The previous owners passed away and the neighbors don't remember where the septic tank was and whether it was collapsed or filled. Can I cut and seal the old vent stack? After 10 years there shouldn't be much to vent.
EJ