VAPOR EMISSION MODELING Sample Clauses

VAPOR EMISSION MODELING. The transport of chemicals from landfills to the atmosphere is a complex process and difficult to predict, since multiple factors influence the movement of chemicals in the soil. The physical properties of the chemical (vapor pressure, solubility, adsorption tendencies), physical properties of the soil matrix (bulk density, porosity, fraction of organic carbon, moisture content), and environmental factors (temperature, humidity, depth to the water table, precipitation, and wind speed) all effect the emission of chemicals from soil. Modeling the transport of chemicals through the vadose (unsaturated) zone typically considers only the dominant transport mechanism. Specifically, for landfills with no internal gas generation, the dominant transport mechanism for volatile, low solubility chemicals is vapor-phase diffusion. For landfills with internal gas generation, movement by convection becomes a significant controlling factor. The following sections discuss two different models which will be employed in the analysis. The first, based on vapor phase diffusion, has the advantage of being able to take into account the fact that site soils have a high moisture content, and although not specifically applicable to the site based on the fact that internal gas generation is occurring, the results can be adjusted to account for gas generation. The second model is specifically applicable to sites with internal gas generation, however it is based on a factor that can not be readily measured in the field and its applicability to sites with moist or wet soils, such as this one, is unknown.
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