SGM-SF_2017with 12/20 Revisions

Health and Safety 41 ANSI/AARST SGM-SF 2017 (with 1220 revisions) Soil Gas Mitigation Standards for Existing Homes 11.4.2 Disclosure All mitigation installers for systems intended to reduce occupant exposure to hazards from chemical vapor intrusion or other soil gas of concern shall be advised of the known hazards of exposure to such substances and the need to apply protective measures when handling and controlling the hazardous substance. 11.4.3 Worker personal protection Informative advisory —Efforts to reduce exposure to hazardous chemicals and substances are paramount when mitigating chemical vapor intrusion. Personal Protection Equipment (PPE) such as impermeable gloves and clothing are important for minimizing dermal contact. Ventilating the workspace and the use of respirators that are suitable for chemical vapors expected to be present are equally important. Note—OSHA mandates special requirements and worker training under certain circumstances. It is also recommended to test for radon gas and monitor for hazardous or explosive gasses. For guidance, see: • The NIOSH pocket guide to chemical hazards: www.cdc.gov/niosh/npg/ • USEPA Benchmarks: www.epa.gov/superfund/health/conmedia/soil/pdfs/tbld2rev.pdf • ATSDR (The Agency for Toxic Substances and Disease Registry) — list of contaminants commonly encountered: www.atsdr.cdc.gov/SPL/index.html — and their minimal risk levels: www.atsdr.cdc.gov/mrls/index.asp 11.4.4 OSHA's HAZWOPER standard Informative advisory — OSHA requirements are summarized in this following excerpt. "The Hazardous Waste Operations and Emergency Response Standard (HAZWOPER) applies to five distinct groups of employers and their employees. This includes any employees who are exposed or potentially exposed to hazardous substances -- including hazardous waste -- and who are engaged in one of the following operations as specified by 1910.120(a)(1)(i-v) and 1926.65(a)(1)(i-v): • clean-up operations -- required by a governmental body, whether federal, state, local, or other involving hazardous substances -- that are conducted at uncontrolled hazardous waste sites; • corrective actions involving clean-up operations at sites covered by the Resource Conservation and Recovery Act of 1976 (RCRA) as amended (42 U.S.C. 6901 et seq.); • voluntary clean-up operations at sites recognized by federal, state, local, or other governmental body as uncontrolled hazardous waste sites; Ta ble 11.4.1 Chemical Exposure Scenarios Summary of various exposure scenarios associated with the installation and maintenance of mitigation systems. Receptor (Persons) Media to Which Exposed Routes of Exposure Common Exposure Durations Hazards Related to Installations Hazards Related to Frequency of Exposure Personnel: Installation of Mitigation System for Chemical Vapor Intrusion Sub-slab soil 1. Dermal contact 2. Ingestion following hand-to-mouth 3. Inhalation of vapor / particulates 4. Ingestion of particulates 2-hr/event Varies depending upon chemicals present on each jobsite and materials used during mitigation system installation Varies from one-time acute exposure to a series of acute exposures over many years (that can combine to result in a subchronic or chronic risk scenario) Indoor air Inhalation of vapor and, to a lesser extent, particulates 6-hr/event Personnel: Monitoring Events Indoor air Inhalation of vapor 1-hr/event Residents Indoor air Inhalation of vapor 12-24 hours/day Short-term and dependent upon materials used during mitigation system installation