SGM-SF_2017with 12/20 Revisions

Additional Requirements—Chemical Vapor Intrusion 56 ANSI/AARST SGM-SF 2017 (with 1220 revisions) Soil Gas Mitigation Standards for Existing Homes 1. A temporary ASD system not necessarily conforming with all requirements of Section 6 ; 2. Enhanced Mechanical Ventilation: The addition of temporary blowers and/or manipulation of HVAC air handler controls. (See Sections 12.3 , 12.4 and 12.8 ); or 3. Other methods that might be applicable but with less certain protections such as carbon filtration of indoor air or sealing large openings to soil. (See Sections 12.12 and 12.13 ). 13.6.2 Limits on temporary solutions All contractor correspondence shall indicate that use of a mitigation system that is not fully installed or not designed as an integral, permanent addition to the building is limited to no longer than 30 days for occupied buildings except with the following requirements for specific cases: a) The use of such temporary system is limited to no longer than 90 days when diagnostics for optimizing final design can be justified to necessitate delay in the installation of a permanent system; or b) The use of such 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 c) The use of such 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 necessitate a delay in the installation of a permanent mitigation system. 13. 6.2.1 Label Temporary Systems The contractor shall place label(s) in a conspicuous location on the system or system components stating the words “Temporary Soil Gas Mitigation 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 A-3.1 The label shall include the responsible party or representative, phone number, and applicable certification number and certifying agency. Note—See label example in Exhibit D. 13. 6.2.2 Risk Communication (Temporary Systems) The contractor shall notify the client of labeling requirements and its content upon implementation of the temporary system. 13. 6.2.3 Request Notification to Occupants The contractor shall request that the client assign a designated party to make all appropriate notifications to occupants and facilitating staff about the temporary nature of the system and related health risk. Note—It is recommended that the contractor obtain signed acknowledgment from the client that the request for notification to occupants was received.