Hi all , I have a steep concrete driveway and about 6 feet from the end ( at a join in the concrete , I no have some very smelly water seeping out . It stinks and appears to have a kind of oily film on the top of it , which after a day or two of sitting seems to look green . I assume this is a leaking sewer pipe ( which runs under the driveway ) . Only thing that Im confused about is that it seems to drip all the time , surely if the pipe was cracked there would only be small amount of seepage as the pipe doesnt have stuff in it all the time . There is no evidence of it being blocked at all . I have read about the insertion of an epoxy soaked pipe into sewage pipes as the way to go in terms of repairing them ( instead of digging everything up ) . Anyone had any experience of this ? is it good ? is it expensive ? thanks all