The basement pCi/L was 12.8. After installing a vent in the sump pump pit along with a RP140 fan, the basement pCi/L is now 0.5. Thanks to Val Riedman for the good advice.
Since radon was prevalent in the area where I built my new house, I had the builder place a 3 PVC pipe into the perforated drainage pipe installed around
After finishing the basement in our 1925 era home with new windows and spray foam insulation I knew I had a very tight basement. I did however, also know