RMS-LB 2018 with 12/20 Revisions

Building Investigations Prior to Design 8 ANSI/AARST RMS-LB 2018 (with 1220 revisions) Radon Mitigation Standards for Schools and Large Buildings c. identification of general safety concerns that may warrant precautions for worker or occupant health to include any visual observations of friable asbestos and flue gas spillage from combustion appliances as described in Section 11.2 . 5.4.3.1 Air Intake Openings An effort shall be made to identify air intake and passive relief vents that might affect choices in design. Among other purposes, this information can aid in prevention of radon re-entrainment into the building from active soil depressurization (ASD ) systems. 5.4.3.2 Mechanical Systems including HVAC The visual inspection shall also include identifying the design nature of HVAC and other mechanical systems that may affect the areas of the building to be mitigated. This includes design nature of HVAC systems that may cause significant building depressurization or have ducting in contact with the soil. 5.4.4 Identify unique sectors The following procedure is required to evaluate mitigation design needs for each portion of a building: a) Within ground contact areas of the building, identify each addition to the original building and each structurally isolated airspace; b) For ground contact areas, identify the general design and intended purpose of each active HVAC component; and c) Classify each of the following areas as a “Unique Sector”: 1. Each ground contact area of the building where the multiple rooms are served by individual yet similar basic heating and cooling technology (as described in Table 5.4.4 for “Group 1” Basic Heating and Cooling, or similar individual room systems); and 2. Each ground contact area of the building served by a central HVAC air handling system. 5.4.5 HVAC usage evaluations Informative advisory —The HVAC design group that serves each unique sector of the building should be documented with either narrative descriptions or annotated on the diagram(s). HVAC operational parameters should be documented with either narrative descriptions or annotated on the diagram(s) to include: a) HVAC setback schedules in terms of hours each day for each operational mode; b) Ventilation systems that actively bring outdoor air into the building (as described in Table 5.4.4 , Group 3) and controls activate these systems. Note—You should consult with a building representative to better identify operating parameters established for the building(s). See Companion Guidance Section E for typical operating parameters of such systems; c) Exhaust systems designed to intentionally cause negative pressure in a unique area of the building (i.e., kitchen, shop or laboratory areas); and d) Ventilation airflow measurements and pressure measurements obtained from existing records or as determined by conducting diagnostic procedures. Figure 5.4.4 Figure 5.4.5 a) and b) Figure 5.4.5