Radon mitigation in 10 Clinton, New Jersey, houses: A case history

The U.S. EPA conducted a radon mitigation demonstration project in Clinton, New Jersey, which included testing radon reduction techniques in 10 houses. The 10 houses were selected from a group of 56 volunteers in the Clinton Knolls subdivision. Each of the 10 selected houses received an intensive radon diagnostic evaluation before a house-specific radon reduction plan was developed. Before and after the plans were implemented, radon concentrations were determined by charcoal canisters and continuous radon monitors. A variety of sealing and sub-slab depressurization techniques were applied to the 10 houses. Radon concentrations were reduced by over 95% in all 10 houses. Three-month alpha track radon measurements will continue in the radon reduction demonstration houses for the next 2 years