There is a vertical 3 inch PVC pipe in my attic that has snapped apart at an elbow and is full of water. When connected it went from the concrete slab up 3 levels into the attic and through the roof. Since I live in a townhouse, that pipe is about 35 ft long at the break. 2 plumbers have said it might be an old radon pipe that filled up with rainwater over the years and snapped at an elbow under the weight of the water. I had the roof end capped to keep the rain out. I called the builder but they couldn't tell me what the pipe was for but they recommended I have it pumped out and reconnected. I'd like to be sure it's not part of the plumbing/venting system. A camera inspection would show that but it's in an un-floored section of my attic and hard to get to and work on. If it's a radon tube I think I'd need it pumped out, reconnected and also have a water proof venting cap installed on it. I can't find anyone to do the job, especially the pumping out part. I live in Northern Virginia and can't physically do the work myself due to a disability, any advice??