I have planning permission to extend my single garage into a double. When I started to dig out the footings I came across a 10" clay pipe about 1 foot down. I have enquired with the local water and sewage authorities and looked at their plans but everyone denies any knowledge of it. From the direction it runs it seems to link in with the storm water drains but that is just an educated guess.
Unfortunately it runs tight alongside the wall I wish to extend from of my existing garage. Does anyone have any suggestions as to how to deal with it?