";s:4:"text";s:15313:"Volatile chemicals may include volatile organic compounds, select semivolatile organic compounds, and some inorganic analytes, such as elemental mercury and hydrogen sulfide. Step 3 – Test indoor air by measuring vapor-forming chemicals in the indoor air, beneath the building’s foundation and in the outdoor air at the same time. We will strive to provide you with emerging issues on topics that are important to you as ag interest owners, wineries, property rights owners, food processors, local governments, public entities, forest product companies, land owners, and timber companies. Rather, Home > Air > DTSC and SWRCB Release Draft Supplemental Vapor Intrusion Guidance. The attenuation factor was calculated by the U.S. EPA based on a study of buildings at contaminated sites. During COVID-19, Financial Services Litigation and Enforcement, Intellectual Property Protection and Enforcement, Manatt COVID-19 Client Service Response Team, Capabilities to Serve Clients In extreme cases, occupants may need to be temporarily relocated. Other agencies, environmental consultants, responsible parties, community groups, and property developers may find the Advisory useful. Step 4 – Act to protect public health, including protecting current occupants, by taking action based on the amount of vapor-forming chemicals in the indoor air; protect future occupants by taking action based on the amount of vapor-forming chemicals underground. Treating commercial buildings in the same manner as residential buildings could create unnecessary new impediments to local economic development. Vapor migration in the subsurface, through building foundations and within buildings is influenced by natural factors such as climate; the condition and structure of buildings; and the operation of the heating, ventilation and air-conditioning systems. Technical Guide for Assessing and Mitigating the Vapor Intrusion Pathway from Subsurface Vapor Sources to Indoor Air (PDF) (268 pp, 3 MB) Errata for Technical Guide for Assessing and Mitigating the Vapor Intrusion Pathway from Subsurface Vapor Sources to Indoor Air (PDF) (1 pg, 45 K) EPA's Vapor Intrustion Guide Fact Sheet (PDF) (2 pp, 343 K) Additionally, environmental professionals implement a vapor intrusion model during assessments. This meeting will also be webcast from CalEPA’s Live Webcasts page For additional public meeting dates and locations, as well as more information regarding how to submit comments, please visit DTSC’s Vapor Intrusion website at https://dtsc.ca.gov/vapor-intrusion/. The draft VI Guidance proposes to rely on the U.S. EPA’s default soil vapor attenuation factor of 0.03 for risk management decisions relative to soil vapor intrusion, all the while acknowledging the shortcomings of the conservative default factor. Interim Framework for Assessment of Vapor Intrusion at TCE-Contaminated Sites in the San Francisco Bay Region (2014) Final Guidance for the Evaluation & Mitigation of Subsurface Vapor Intrusion to Indoor Air (2011) *Please note this is not the complete list of existing vapor intrusion guidance documents. Additional topics covered by the Draft Guidance include: The SWRCB and DTSC will hold informational public meetings and webinars throughout California to answer questions and receive comments on the Draft Guidance, the first two of which are scheduled for April 1, 2020 at 1:00pm and 6:00pm at CalEPA Headquarters in Sacramento: CalEPA Headquarters – Sierra Hearing Room. 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