System Design 6 ANSI/AARST RMS-LB 2018 (with 1220 revisions) Radon Mitigation Standards for Schools and Large Buildings b) Durability ; c) Acceptable aesthetics (including system appearance, noise and occupant comfort); d) Ease of service; and e) Long-term cost (that includes power consumption, conditioned air loss and maintenance and future replacement costs of system components). Note—Design choices should incorporate options that maximize energy conservation; 5.3.1 Other building systems The mitigation system shall be designed and installed to avoid compromising the function of any mechanical system or ground water control system and to avoid obstructing doorways or windows and accessibility to switches, controls, electrical boxes or equipment requiring maintenance. 5.3.2 Adjoining units or dwellings Considerations during design and installation shall include potential impact on adjoining occupied spaces within a shared building. Where one systemmight be intended to mitigate several units, dwellings or other areas within a shared building, see requirements for collateral mitigation in Section 8.3.5 and disclosures in Section 10.3 . 5.3.3 Permanent systems required Mitigation systems shall be designed and installed as an integral, permanent addition to the building. 22.214.171.124 Limits on Temporary Solutions When delays in the installation of a permanent mitigation system are unavoidable and a temporary system utilizing any mitigation method is employed, the following actions are required: a) Labeling The contractor shall place label(s) in a conspicuous location on the system or system components stating the words “Temporary Radon Reduction System” and the date of implementation. The label(s) shall also include a description of the temporary system and an estimated date for completion of a permanent system that shall not exceed the time limits in Section 126.96.36.199 b . The label shall include the contractor's name, phone number, and applicable certification number and certifying agency. Note—See label example in Exhibit C . b) Time Limits All contractor correspondence shall indicate that use of a temporary mitigation system is limited to no longer than 30 days except for the following specific cases: 1. The use of a temporary system is limited to no longer than 90 days where diagnostics for optimizing final design can be justified to necessitate delay in the installation of a permanent system; or 2. The use of a temporary system is limited to no longer than 90 days subsequent to completion of major renovation, change in building use, or building permit requirements that necessitate delay in the installation of a permanent mitigation system; or, 3. The use of a temporary mitigation system shall be extended only to a point that is reasonably appropriate when multiple parties or jurisdictions of authority must individually and collectively approve the installation plan and the logistics of such approval process thereby necessitates a delay in the installation of a permanent mitigation system. c) Risk Communication The contractor shall notify the client of labeling requirements upon implementation of the temporary system. In addition, the contractor shall provide the client with risk information relative to concentrations measured in the dwelling(s) as portrayed in EPA’s publication “Citizens Guide to Radon” or state publications. Note—The contractor should inform the client that the standard of care requires due diligence for timely completion of a permanent mitigation system and that the client is responsible for the health and safety of occupants. Where measured concentrations exceed those rendered in EPA’s “Citizens Guide to Radon” (e.g., > 20 pCi/L [740 Bq/m 3 ]), an extrapolation of the greater risk indicated should be included. See example in Exhibit C.