Any radon assessment and mitigation plan shall include appropriate measures designed to detect, avoid, or dissipate dangerous levels of radon gas at potential building sites or during construction of new residential buildings in areas affected by radon. Any of those measures shall be appropriately delineated so as to apply only to certain at-risk buildings and geographic areas, and the plan shall specify construction projects, building characteristics, and geographical areas to which the measures apply, to assure ease of compliance and consistency with the findings and assessment of the United States Environmental Protection Agency regarding radon risks. The plan may include reasonable provisions for testing and detection of radon at potential building sites as well as measures to provide for the appropriate radon-dissipating ventilation and insulation of new residential construction consistent with prevailing techniques.
Ca. Health and Saf. Code § 105430