CC-1000_2018

Soil Gas Control Systems ANSI/AARST CC-1000 2018 in New Construction of Buildings 2 chemical vapor intrusion, see ANSI/AARST SGM-SF “ Soil Gas Mitigation in Existing Homes.” 1.5.6 Sources other than soil gas This standard does not address mitigation techniques for hazards other than soil gas, such as airborne radon that results from radon in water, building materials or other less common radon sources. 1.5.7 Changes to structure Effectiveness witnessed as a result of specifications in this standard cannot be guaranteed or be sustainable where modifications, alterations, structural changes or additions to a building occur. 1.5.8 Prior systems This standard shall not apply to systems installed prior to the effective date of this standard. 1.5.9 Safety This standard is not intended to address all of the safety concerns associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices. It is the responsibility of the user of this standard to determine the applicability of regulatory limitations prior to use. SECTION 2: TERMS AND DEFINITONS Terms not defined herein have their ordinary meaning as defined in “Webster’s Collegiate Dictionary.” 2.1 active soil depressurization (ASD), n— A fan-driven system to create a vacuum beneath a structure that is greater in strength than the vacuum applied to the soil by the building above. 2.2 base (or base course), n— The layer of gas permeable material on top of the subbase and directly under the slab. 2.3 branches, n— Air duct piping that routes air from only one inlet or inlet network. 2.4 collection wells, n— Pits designed as a soil gas inlet or to transition or join multiple trunks or branches of an inlet trunk network. 2.5 crawl space, n— A foundation type with an open area beneath livable or enclosed spaces that typically has either a concrete slab or earthen floor and is surrounded by foundation and/or partition components that typically includes flooring above the soil. 2.6 duct piping, n— See exhaust vent piping 2.7 equivalent length, n— The resistance of a duct and additional resistance caused by a pipe elbow, valve, damper, orifice, bend, fitting, or other obstruction to flow, expressed in the number of feet of straight duct or pipe of the same diameter that would have the same resistance. 2.8 exhaust, n— A pipe or other piece of apparatus through which soil gases escape or are discharged. 2.9 exhaust vent piping, n— Sometimes referred to as a riser pipe, main stack or vent pipe, these air duct trunk or branch pipes transfer air between soil gas inlets or inlet networks within the soil gas collection plenum and the outside air exhaust location above the roof. 2.10 gas permeable layer, n— Void space or permeable aggregate that allows hydraulic conductivity for soil gas movement into and across a soil gas collection plenum. 2.11 hydraulic conductivity, n— The capacity of liquids or gas to pass through permeable materials. 2.12 inlets, n— See Soil Gas Inlets. 2.13 inlet piping, n— Air duct piping that connects one or more soil gas inlets to exhaust piping . 2.14 inlet trunk network, n— Air duct pipe configuration that connects one or more soil gas inlets to exhaust piping . 2.15 main trunks, n— Air duct piping that routes the entire system air volume capacity from the soil gas collection plenum(s) to the system exhaust or termination point. Above slab main trunks are commonly referred to as the “main stack” or “riser pipe.” 2.16 mitigation system, n— Any system designed to reduce indoor concentrations of radon or other soil gas pollutants. 2.17 plenum, n— See Soil Gas Collection Plenum 2.18 primary trunks, n—Main trunks that directly adjoin an ASD fan. 2.19 qualified mitigation professional, n— An individual that has demonstrated a minimum degree of appropriate technical knowledge and skills specific to radon mitigation: a) as established in certification requirements of the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB); and b) as required by statute, state licensure or certification program, where applicable. 2.20 radon (Rn), n— 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 Becquerel per cubic meter (Bq/m 3 ) 2.21 secondary trunks, n— Air duct piping that routes only a portion of the system air volume capacity from more than one inlet. 2.22 soil gas, n— Air within soil that can contain radon or other hazardous gasses or vapors. 2.23 soil gas collection plenum, n— A three-dimensional enclosure, in whatever shape it may be, constructed for collecting radon and other soil gases from under slabs, soil gas retarders and from behind walls that surround a void or gas-permeable layer. This description of the cavity under a foundation observes that there are at least six sides to this enclosed airspace and that none are perfectly sealed, especially at the side facing soil. 2.24 soil gas control, n— Planned control of soil gasses to reduce radon concentrations or other pollutants in indoor air. 2.25 soil gas inlets, n— Air transfer openings to the face of adjoining granular aggregate or soil sometimes referred to as suction points for ASD systems. 2.26 soil gas retarder, n— Pliable plastic sheeting that establishes a barrier between soil gas and enclosed spaces within a building. Commonly referred to as “vapor barrier.”