I recently had my in-ground concrete pool closed and during the process the technician discovered a leak in the return lines. When he pressurized the return lines, air and water came up from under ground about 3 feet from the edge of the concrete decking (which is 4ft wide). When I got home I could clearly see the spot where the air/water had escaped. Oddly, there are no pipes running adjacent to that spot (I got to see the plumbing when the pool was built 3 years ago). Also strange is that I observed no indication of a leak in the system before I drained the water down and had the pool closed.
Has anyone had a situation like this?
Is it normal for the air/water to escape the ground so far away from the source of the leak?
Could the process of lowering the water (below the return line) and pressurizing the line CAUSE the leak or expose the existence of a leak?
I believe the leak is under the concrete decking - what should I do now?