SGM-SF_2017with 12/20 Revisions

ANSI/AARST SGM-SF 2017 (with 1220 revisions) Soil Gas Mitigation Standards for Existing Homes 51 13.0 ADDITIONAL REQUIREMENTS—VAPOR INTRUSION 13.1 Qualified Professionals and Teams 13.1.1 Qualified professionals are required Qualified contracting or management teams shall include at least one “Qualified Soil Gas Mitigation Professional.” For compliance with the intent and purposes of this standard, persons, including soil gas mitigation professionals, hazardous waste consultants and system designers, shall be qualified for their apportioned task. 13.1.2 Qualified Soil Gas mitigation professionals “Qualified Soil Gas Mitigation Professionals” are defined as “An individual who has demonstrated a minimum degree of appropriate technical knowledge and skills specific to radon mitigation and additionally specific to mitigation of existing homes for soil gas entry that contains hazardous chemicals, vapors or gas: a) as established in the chemical vapor intrusion requirements for certification 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.” Criteria for determining qualifications or credentials for professionals who mitigate exposure to chemical vapor intrusion or other gases include demonstration of all qualification criteria associated with a radon mitigation professional and additional training and skills needed to comply with Sections 11 and 13 of this standard. 13.2 Assemble Site Information 13.2.1 Handling and control of hazardous substances and condition The contractor shall request from the client a written statement confirming any need, or if there is not a need, for special considerations in handling and control of hazardous substances and other site conditions, to include: a) Worker Exposures: This consideration is specific to maximum concentrations that workers should expect to encounter from inhalation, ingestion and dermal exposures to hazardous substances; b) Groundwater and Soil: This consideration is specific to soil and groundwater toxicity that might be encountered in close proximity under the building, including groundwater that can intermittently be found in sump wells or intruding above slabs and into crawl spaces ; c) Contaminated Vapor: This consideration is specific to contaminated vapor exhausted from active soil depressurization (ASD) systems and evaluations after installation for compliance with federal, state or local requirements or guidance; d) Flammable or Explosive Gasses or Vapors: This consideration is specific to flammable or explosive gasses or vapors; and e) Other Known Hazards: This consideration is specific to safety hazards as known by the client for each building being mitigated to include, among others, pesticides, asbestos, lead paint, fire hazards, underground utility dangers or other hazards. Responses shall be sought from the client in these regards, and the overseeing team , overseeing professional or Environmental Consultants shall provide safety guidance related to known chemical hazards at the site. It is highly recommended that the contractor obtain written information sufficient to facilitate responsible practices prior to contract engagement or initiation of mitigation activities. Note—See the Companion Guidance for discussion on activities that normally are outside the scope of work. 13.2.2 Existing measurements (chemical vapor intrusion) The contractor shall request from the client all measurement reports and diagnostic information available related to the common building structure(s) or portion(s) of the building(s) to be mitigated. This includes: a) existing measurements of chemicals or substances that relate to the purpose of the mitigation project, including chemical(s) of concern, regulatory action levels for site classification and supporting toxicology information; b) existing indoor air measurements, sub-slab measurements, groundwater measurements, outdoor air measurements, and existing data regarding soil gas origination and pathway of migration; and c) information on diagnostics conducted or planned and information on any other concurrent remedial actions.