floor systems / gas-permeable material / gas-permeable layer / soil-gas-retarder membrane / equivalent gas-tight pipe / energy conservation provisions / radon mitigation systems / closure systems / radioactive gas / /
NaturalFeature
Hood River / /
Organization
United States Environmental Protection Agency / AF103.4.5 Foundation / Oregon Health Authority / Residential and Manufactured Structures Board / Freemasonry / Building Codes Structures Board / /
Position
Director of the Department / General / director / /
ProvinceOrState
Polk / Clackamas / Any / Yamhill / Multnomah / Hood River / Washington / /