AIR DISPERSION MODELING Sample Clauses

AIR DISPERSION MODELING. The assessment of potential health risks for this site requires the prediction of exposure point concentrations both at the site of the emissions as well as off-site. The approach to predicting on-site and off-site contaminant concentrations is addressed in the following sections. 4.4.2.1 On-Site Dispersion Modeling No widely accepted approach to the modeling of on-site air concentrations currently exists. There are a variety of methods and model adaptions that can be used to predict on-site concentrations. Some of the approaches, generally those easiest to apply, are overly simplistic and result in considerable over-estimation of actual concentrations. However. these simplistic models can be used as screening tools to determine whether more complex modeling is necessary. 276 TABLE 4-1 SOIL VAPOR EMISSION ESTIMATES (g/cm2-sec) Compound Thibxxxxxx Xxxel All Scenarios Current Cap No-Cap Developed Cap -------------------------------------------------------- Benzene 8.80E-14 4.50E-16 2.70E-14 3.00E-17 Methylene Chloride 1.70E-14 8.50E-17 5.10E-15 5.60E-18 Chloroform 1.60E-14 8.20E-17 4.90E-15 5.40E-18 Trichloroethene 8.70E-15 4.20E-17 2.50E-15 2.70E-18 1,1,1 Trichloroethane 5.30E-15 2.50E-17 1.50E-15 1.60E-18 Ethyl Benzene 7.00E-14 2.80E-16 1.60E-14 1.80E-17 1,2 Dichloroethene 3.20E-14 1.50E-16 8.90E-15 9.80E-18 Vinyl Chloride 3.30E-14 2.10E-16 1.20E-14 1.40E-17 277 RISK ASSESSMENT PAGE 4-19 One of the simplest approaches to the prediction of on-site concentrations is the use of what is commonly called a "box" model. A box model typically uses the concept of a theoretically enclosed space or box over the area of interest. The model assumes the emission of compounds into the box with their removal based on wind speed (such as annual average wind speed for the site). Airborne concentrations for this enclosed space can then be calculated and used as the on-site exposure point concentration. The box model fails to fully take into account the various processes of dispersion and may lead to the prediction of relatively high exposure concentrations even at relatively small emission rates. The exposure concentration in the theoretical box is calculated using the following equation: Box Concentration (ug/m(3)) = (F x A)/(u x h) Where:
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AIR DISPERSION MODELING. Furniture Design and Specification Package to FP&C 5.1.7 Building Security Planning Services 5.1.8 Construction Cost Estimating Services 5.1.9 A/V Active Equipment Design

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