In August 2016, Ohio EPA’s Division of Environmental Response and Revitalization (DERR) released guidance specifically for sites with a potentially complete pathway for trichloroethene (TCE) concentrations in the groundwater or sub-slab vapors to migrate to indoor air and where sensitive receptors (i.e., women of childbearing age) may be exposed.
Although this guidance does not have the force of law, Ohio EPA recommends its use to stakeholders, including the Voluntary Action Program, in evaluating the concentrations of volatile compounds in ground water, soil gas, or indoor air for residential and commercial scenarios. As a result of this revised guidance, projects should re-evaluate the vapor intrusion pathway to ensure on and off-property receptors are not at risk from the vapor intrusion pathway. Projects currently under review may be re-evaluated against these changes in guidance and closed TCE sites that used modeling only are being re-opened.
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