SGM-SF_2017with 12/20 Revisions

ANSI/AARST SGM-SF 2017 (with 1220 revisions) Soil Gas Mitigation Standards for Existing Homes 67 14.0 DESCRIPTION OF TERMS Terms not defined herein have their ordinary meaning within the context of their use as defined in “Webster’s Collegiate Dictionary.” Active soil depressurization (ASD): A family of radon mitigation systems involving mechanically-driven soil depressurization, including sub- slab depressurization (SSD), sub-membrane depressurization (SMD), block wall depressurization (BWD) and crawl space depressurization (CSD). Backer rod: A semi-rigid closed-cell foam material resembling a rope (available in various diameters) that is used to fill around pipes, large cracks, etc. to assist in making a sealed penetration. Becquerel per cubic meter (Bq/m 3 ): A unit of measure for the amount of radioactivity in one cubic meter of air. CONVERSION: 1 Bq/m 3 equals 0.027 picoCuries per liter ( pCi/L ). Chemicals of Concern (COCs): Chemicals in vapor, liquids or soil that have been identified at a site location to potentially pose health and safety hazards. Client: The person(s), or company that contracts with a contractor to install a mitigation system in a building. Collateral mitigation: The ability to mitigate more than one occupied dwelling or unit with a single mitigation system. Continuous Duty: A motor may be rated as either continuous duty or intermittent duty. Continuous duty rated motors are rated to be run continuously without any damage or reduction in life of the motor while intermittent duty motors must be allowed to stop and cool before restarting. Contractor: Any person(s) or contracting firm regardless of organizational structure who installs a mitigation system. See Section 3 for descriptions of Qualified Mitigation Professionals. Crawl space: A foundation type with an open area beneath the livable space of a dwelling that typically has either a concrete slab or earthen floor. Cubic feet per minute (cfm): A measure of the flow rate of a fluid, such as air. CONVERSION: 1 cfm = 1.699 cubic meters/hour (m 3 /hr). Depressurization: A negative pressure induced in one area relative to another. Diagnostic procedures: One or multiple procedures for identifying or characterizing conditions under, beside and within buildings to project the effects of various system designs. Diagnostic procedures can include: sub-slab pressure field extension tests or analysis; visual observations; characterization of pressure or air exchange rates between indoors and outdoors and also between floors or adjoining air spaces; and diagnostic radon measurements at locations of interest (e.g. common areas, mechanical spaces and spaces not in ground contact). Diagnostic radon measurements: Diagnostic Radon Measurements are intended to confirm specific conditions or effects of mitigation activities. Test locations are identified by their relationship to the specific information being sought. Diagnostic Radon Measurements are not a substitute for testing in accordance with ANSI/AARST measurement protocols. Dwelling: A building or portion of a building that is used, intended or designed to be built, used, rented, leased, let or hired out to be occupied or that are occupied for living purposes. Feet per minute (fpm): A measure of the velocity rate of a fluid, such as air. CONVERSION: 1 fpm = 0.3048 meters per minute (0.3m/min). Flue gas spillage: A condition in which the normal movement of combustion products up a flue (due to the buoyancy of the hot flue gases) is reversed, resulting in the combustion products entering the building. Flue gas spillage of combustion appliances (such as fireplaces and furnaces) can occur when depressurization in the house overwhelms the buoyant force of the hot gases. Flue gas spillage can also be caused by a blockage in the chimney or flue termination. High-rise building: A building that is 75 feet (23 m) or higher. HAC system: Heating and cooling (air conditioning) systems that are not designed to also supply outdoor air ventilation. HAC systems are common to single-family residences. HVAC setback: HVAC “setback” is normally the automated or manual operation of system controls to cause different activity for heating, cooling and ventilation systems during occupied periods compared to un occupied periods. HVAC system: Heating and cooling (air conditioning) systems that are additionally capable of supplying outdoor air ventilation. If they do not supply outdoor air ventilation, they are more technically referred to as HAC systems . Informative: Informational content or guidance that is not considered mandatory by this document. Intentional collateral mitigation : ASD system(s) intentionally designed to reduce radon concentrations in multiple dwellings that have each been identified by testing to indicate radon concentrations that exceed acceptable limits.