SGM-SF_2017with 12/20 Revisions

Description of Terms 69 ANSI/AARST SGM-SF 2017 (with 1220 revisions) Soil Gas Mitigation Standards for Existing Homes Quality Management System (QMS): A documented plan of action, often described as a QA plan, that includes Quality Control Procedures for tracking the difference between planned actions and the actual resulting installation or product with systematic review for managing and improving quality. Radon (Rn): A colorless, odorless, naturally-occurring, radioactive, inert gaseous element formed by radioactive decay of radium-226 (Ra- 226) atoms. The atomic number is 86. Although other isotopes of radon occur in nature, in this document, radon refers to the gas Rn- 222. Rn-222 is measured in picocuries per liter (pCi/L) or in becquerels per cubic meter ( Bq/m 3 ) Re-entrainment: The unintended re-entry into a building of radon or soil gas that is being exhausted by a mitigation system. Responsible Party (RP): Can be the property owner(s) or extend to include private businesses and/or governmental agencies Sealed isolation assemblies: The surrounding physical components to an airspace that might include the entire building shell or an isolated airspace within a building that has been sealed to resist air movement between the isolated airspace and both indoor air and outdoor air. Setback: See HVAC Setback . Significantly occupied: The time period when the building is typically occupied by the majority of the workers or students. See “Normal Occupied Operating Condition”, “Occupied”, “Significantly occupied” and “Occupied work or school weeks”. Soil gas collection plenum: A 3-dimensional enclosure for collecting radon and other soil gases from under slabs, soil gas retarders or from behind walls that surrounds a void or gas permeable layer. There are at least six sides to this enclosed airspace and none are perfectly sealed, especially at the side facing soil. Suction pit: Space that exists or is created below the suction pipe. Suction point: Location at which suction piping is routed through the slab, foundation, membrane, drain tile or sump cover. Sump (Sump pit): A pit below the subsurface grade of a building, which is commonly intended as a component of a ground water control system. Sump pumps and drainage piping are often additional components of such ground water control systems. Townhouse: A single family dwelling (also referred to as a townhome) that is constructed in a group of three or more attached units where each unit extends from the foundation to the roof and has a yard or public way on at least two sides. Unique sector of a building: Portions of a common building that are individually classified by the general design and the intended design of each active heating, cooling and ventilation system (HVAC). Unit: 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 is occupied for commercial, residential or public purposes. Working level (WL): Any combination of short-lived radon decay products in one liter of air that will result in the ultimate emission of 1.3 x 105 MeV of potential alpha energy. This number was chosen because it is approximately the alpha energy released from the decay products in equilibrium with 100 pCi of Ra-222. Exposures are measured in working level months (WLM). Working Level Month (WLM): A unit of concentration radioactivity corresponding to 1 working level (WL) for 170 hours per month. Although this unit of measurement came from assuming 40-hour work week exposures, it is commonly used to set limits for annual exposure to radon decay product alpha energy.