I know this is not automotive related but a significant chunk of VA has a radon problem. If you have not had testing done, I recommend Jim Schroff who owns Radon Testing Inc, PO Box 7304, Fairfax Station, VA. They can be reached at (703) 591-1111. He tested, found our levels to be 11.0. After a mitigation system was installed at a very good price, we had 1.2, well below the govt standard of 4.0. I think he tests very reasonably for club members.