Caption title. "Sept. 1987." "EPA/600-S8-87-027." At head of title: Project summary. Distributed to depository libraries in microfiche.

In the spring of 1986, the New Jersey Department of Environmental Protection (DEP) found a cluster of houses with extremely high radon levels in the town of Clinton, New Jersey. Research Triangle Institute was contracted to develop and demonstrate radon reduction techniques in 10 of these houses. The work was to be completed before the 1986-87 winter heating season began. The demonstration homes were selected from 56 houses in the subdivision of Clinton Knolls. All of these houses had shown radon concentrations in excess of 64 pCi/l when monitored in the spring of 1986. Each of the houses was inspected, and 10 representative houses were selected for the radon reduction demonstration project. Following intensive diagnostic work and monitoring in each of the houses, a radon reduction plan was developed. With the agreement of the homeowners, radon reduction systems were installed during the summer of 1986. All 10 houses had radon concentrations significantly reduced by the fall of 1986. The average cost of radon reduction was $3,127.