Areas that have low permeability soil or soil with high moisture content that limit or inhibit the ability of vapors to migrate vertically or laterally may reduce the LIZ or make the pathway not relevant/complete. An evaluation of the soil permeability and potential for vapor transmission will aid in this determination. A further discussion on the permeability of vadose zone soil and an SOP for the Pneumatic Testing of Subsurface Soil to Evaluate Permeability and Vapor Transmission can be found Volume 2 – Investigation Methods for the Volatilization to the Indoor Air Pathway though other methods may be proposed.
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