This technical guidance document has been prepared to serve as a comprehensive aid in the detailed selection, design, installation and operation of indoor radon reduction measures for existing houses based on active soil depressurization techniques. It is intended for use by radon mitigation contractors, building contractors, concerned homeowners, state and local officials and other interested persons. Office of Research and Development.

• Radon Reduction Technique for Existing Detached Houses Technical Guidance for Active Soil Depressurization Systems (PDF)(334 pp, 29 MB, October 1993)