2010 Oregon Structural Specialty Code Special Amendment Section 1812 Radon Mitigation R-2 and R-3 New code section 1812 has been adopted by the State of Oregon. Effective Date: April 1, 2011 The over-all purpose of the proposed amendments to the 2010 OSSC is to implement Senate Bill 1025 approved by the 2010 Legislature. The bill required the Building Codes Structures Board to adopt radon mitigation standards for certain types of new residential buildings and new public buildings. Radon mitigation standards adopted by these rules amend the 2010 OSSC. These requirements are applicable in Baker, Clackamas, Hood River, Multnomah, Polk, Washington and Yamhill Counties.