California regulators have announced that the comment period for a recent proposal, Supplemental Guidance: Screening and Evaluating Vapor Intrusion, has been extended to June 1, 2020, and public workshops and webinars originally scheduled for April have been postponed until further notice.
Vapor intrusion occurs when contamination moves from groundwater and soil beneath a structure into the air, accumulating in occupied areas where they can result in safety hazards or health effects. Common vapor-forming chemicals include volatile organic compounds including trichloroethylene (TCE), mercury, polychlorinated biphenyl (PCB), and certain pesticides. Testing for vapor intrusion is an important step in investigating a potential development site, and in ensuring the health and safety of existing residential and commercial buildings.Continue Reading Update – New California Supplemental Vapor Intrusion Guidance Comment Period Extended, Trainings Postponed