Yep, checked the charts and we’re in the middle of the three categories. Not the highest, not the lowest. Having a family member sleep and work in the basement and the radon level is a little over 1 which is below the EPA concerning limit of 4 but still, it’s twice as high as our upstairs. Wouldn’t mind reducing that number more so just to be safe.
Our company has used Advanced Radon Technologies out of Spokane. In the past, Dave has come over to the Puget Sound area for maintenance and installation of mitigation fans for vapor intrusion issues (explained on his website). He has many years experience. I’d give him a call to discuss your concerns. http://advancedradontech.net/