I have a sump pump pit in my basment. It has a strong sewer smell coming from it. The sump pump is piped into the plumbing. It was replaced along with the check valve appox 6months ago. This leads me to believe that I have a broken pipe out side of the house and sewer water is draining into the footing drain. However their is no water coming up the surface. If i do have a broken pipe what is the method for splicing in a new section. It is probably cast iron pipe because we were on septic and now tied into the city sewer. But if it turns out to be clay pipe how do i spice in?