I emailed Val after a radon specialist wanted to dig holes in the basement to determine why my radon mitigation system was not working. The radon level in the basement was between 8-10 pCi/L. Val asked me a couple of questions before he figured out what was wrong. He determined that a blockage at the bottom of the radon system was causing the increased level. We had cut the base and removed the small rocks. One week later, the radon level is less than 0.5.