SGM-SF_2017with 12/20 Revisions

Note—12/20 revision (The remainder of this document does NOT contain changed requirements) ANSI/AARST SGM-SF 2017 (with 1220 revisions) Soil Gas Mitigation Standards for Existing Homes 35 9.0 RADON POST-MITIGATION 9.1 Post- Mitigation Functional Evaluation 9.1.1 For ASD systems In conjunction with activating an active soil depressurization (ASD) system, the suction in system’s main riser piping (e.g., fan monitor) shall be measured and recorded. Informative advisories— (1) At least one pressure field extension (PFE) measurement is strongly recommended upon completion of installation. This practice is widely witnessed to reduce unnecessary or unexpected costs of repeated retests and further system enhancement. (2) Post- mitigation PFE measurements should be considered particularly important where the contractor has little experience in similar buildings. (3) Locations where PFE tests are made should be recorded and the test holes or test ports be closed in a nonpermanent fashion to facilitate any future needs. (4) It is further recommended to include consideration for worst-case conditions when evaluating the results of post- mitigation PFE measurements. 9.1.2 Inspection for compliance 9.2 Note— Section 8.5 contains requirements to inspect the system after installation. Initial Radon Test After Mitigation To provide an initial measure of system effectiveness, a short-term radon measurement shall be conducted no sooner than 24 hours after a mitigation system is operational and within 30 days after installation of the system(s). Exception: It shall be permissible that the initial retest after mitigation is delayed beyond 30 days in accordance with Section 13.6.2. 9.2.1 Non-ASD If applicable, additional testing requirements in Section 12 for non- ASD systems shall also be conducted. 9.2.2 Qualified Measurement Professionals For the purpose of this document, a Qualified Measurement Professional is an individual who has demonstrated a minimum degree of appropriate technical knowledge and skills specific to radon measurement in single-family residences: 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. 9.2.3 Contractor obligations Contractor obligations to ensure post- mitigation testing is conducted have been satisfied once post- mitigation test results are accepted by the client as satisfactory evidence for the initial status of system effectiveness. For the purposes of this initial post- mitigation test, contractor obligations are satisfied regardless of whether this testing is conducted by: a. an independent, qualified measurement professional; or b. the contractor who installed the mitigation system(s), if also a qualified measurement professional (and if allowed by local statutes or code). To avoid any appearance of conflict of interest, the contractor shall recommend to the client that post- mitigation testing be conducted by an independent qualified measurement professional; or c. the owner or occupant of the home. 9.2.3 .1 Exception : Contractor obligations to obtain some form of test data that sufficiently demonstrates initial system effectiveness are, under this standard, satisfied when the client and client representatives or other person responsible for the property: a) refuse to provide access or retest reports, or b) are nonresponsive to outreach efforts to coordinate testing or obtain test reports; or c) are prohibited by state or local law from contacting the person(s) responsible for the property. If access is refused or legally unavailable, or if reasonable efforts across 3 months after installation do not result in a response, the contractor shall forward a radon test kit to the property in care of the current occupant. The