CC-1000_2018

Soil Gas Control Systems ANSI/AARST CC-1000 2018 in New Construction of Buildings 23 12.3 OM&M manual recommended radon testing The following statements regarding radon testing in Sections 12.3.1 through 12.3.4 , or equivalent statements, shall be included in the OM&M manual: 12.3.1 Radon testing recommended • “It is recommended that all new buildings be tested for radon gas after initial construction in accordance with standard practices specified in national 16 , federal or state standards regardless of steps taken during building construction to reduce soil gas entry”; 12.3.2 Elevated radon concentrations (e.g., ≥ 4 pCi/L) • “If testing at any time indicates concentrations above the action level, it is recommended to conduct evaluations of the mitigation systems(s), corrections and further testing until testing indicates radon concentrations have been mitigated to below the action level. It is recommended that all buildings where elevated radon has been found and mitigated be retested in accordance with standard practices specified in national, federal or state standards at least every 2 years.” 12.3.3 If passive or non-ASD systems are installed • “If the mitigation system is based on passive methodologies or includes pressurization or dilution of building air, additional seasonal testing is required. Conduct post-mitigation or diagnostic radon testing during the first year subsequent to construction to verify if system capacity and control settings are effective under stressed or different seasonal conditions. Repeat testing procedures to verify effectiveness is retained for both the: a) heating season (i.e., when outdoor temperatures at least at night are less than 65˚ F [18 C]); and b) cooling season (i.e., when outdoor temperatures at least in daytime are greater than 83˚ F [28 C]).” 16 National measurement standards include, as applicable: ANSI/AARST MAMF "Protocol for Conducting Radon and Radon Decay Product Measurements In Multifamily Buildings" ; ANSI/AARST MALB "Protocol for Conducting Measurements of Radon and Radon Decay Products In Schools and Large Buildings" ; or ANSI/AARST MAH "Protocol for Conducting Measurements of Radon and Radon Decay Products in Homes" . 12.3.4 Low concentrations (e.g., < 4 pCi/L) (per initial testing or after activating mitigation systems) • Retest the building(s) at least every 5 years and in conjunction with any sale of a building. • In addition, be certain to test again when any of the following circumstances occur: 3 A new addition is constructed or alterations for building reconfiguration or rehabilitation occur; 3 A ground contact area not previously tested is occupied; 3 Heating or cooling systems are altered with changes to air distribution or pressure relationships; 3 Ventilation is altered by extensive weatherization, changes to mechanical systems or comparable procedures; 3 Sizable openings to soil occur due to: - ground water or slab surface water control systems are added or altered (e.g., sumps, perimeter drain tile, shower/tub retrofits, etc.); or - natural settlement causing major cracks to develop; 3 Earthquakes, construction blasting or formation of sink holes nearby; or 3 A mitigation system is altered, modified or repaired. SECTION 13: ADDITIONAL CONSIDERATION FOR CHEMICAL VAPOR INTRUSION 17 AND OTHER HAZARDOUS SOIL GASES 13.1 Lines of evidence and collective expanses. When lines of evidence indicate that the spatial distribution of a hazardous gas or chemical of concern may be limited to only one portion of a building, an evaluation shall be made for the appropriateness of limiting plenum sizes that are joined to each soil gas vent system (e.g., to less than 4,500 square feet [418 m 2 ] expanses). The criteria for determining appropriate limits shall include the likely need of ASD fan control for areas where there is a known soil gas concern. 13.2 Duct pipe materials. An evaluation shall be made prior to installation regarding the corrosive effects that chemicals may have on the iron, steel, copper or other pipe materials. 17 For additional health and safety considerations when the purpose of soil gas control is chemical vapor intrusion, see ANSI/AARST SGM-SF "Soil Gas Mitigation in Existing Homes" .