SGM-SF_2017with 12/20 Revisions

Vapor Intrusion (VI)—Informational Guidance 61 ANSI/AARST SGM-SF 2017 (with 1220 revisions) Soil Gas Mitigation Standards for Existing Homes A-1.5 Partial list of chemicals commonly associated with contaminated indoor air (and potential sources) 14 Advisory Note 2 There are many thousands of contaminants in commerce and others that occur naturally. Compiling a definitive list that might be encountered at a contaminated property is not feasible. Benzene (Collectively known as BTEX; gasoline, diesel fuel, #2 fuel oil) Toluene Ethylbenzene Xylenes Carbon tetrachloride (tetrachloromethane; chemical releases from cleaning fluids or other industrial discharges) Tetrachloroethylene (perchloroethylene, or PCE; chemical releases at dry cleaning facilities; other industrial discharges) Trichloroethylene (TCE; degradate of PCE; other industrial discharges) cis-1,2-Dichloroethylene (cis-1,2-DCE; degradate of TCE; other industrial discharges) trans-1,2-Dichloroethylene (trans-1,2-DCE; degradate of TCE; other industrial discharges) Vinyl chloride (VC; degradate of cis-1,2-DCE and trans-1,2-DCE; other industrial discharges) A-2 Guidance for Teams A-2.1 Roles and responsibilities Informative advisories —Efforts to reduce occupant exposures to hazardous soil gas often times begin with decisions made by persons responsible for possible vapor intrusions into a property. This Responsible Party (RP) can be the property owner(s) or extend to include private businesses and/or governmental agencies. Commissioning When achieving an objective requires persons qualified in varied disciplines with different skill sets, a commissioning process first engages identification of roles and responsibilities of an Overseeing Team . The overseeing team will normally include: a) The Responsible Parties; b) Regulatory Authorities when compliance with local, state or federal regulatory standards is required; and c) An Overseeing Professional to assemble and coordinate a qualified team of professionals of diverse skill sets. Qualified contracting or management teams for vapor intrusion normally include at least one qualified Environmental Consultant (EC). Soil Gas Mitigation Design, implementation and stewardship of techniques to reduce soil gas entry require technical knowledge and skills specific to: a) fluid mechanics of building air pressure and its dynamic interaction with distribution and entry of both soil gas and outdoor air; and b) building construction practices. 14 States or local jurisdictions often publish more complete guidance and jurisdictional requirements. For further information, see the U.S. Environmental Protection Agency (EPA). 2015a. Vapor Intrusion Screening Level (VISL) Calculator, User’s Guide at: www.epa.gov/oswer/vaporintrusion/guidance.html For worker health guidance, see: The NIOSH pocket guide to chemical hazards: www.cdc.gov/niosh/npg/