Draft Environmental Impact Statement for the tank waste remediation system. Volume 5

This appendix describes the air dispersion modeling that was performed to assess the impacts on air quality resulting from normal operations associated with the various Tank Waste Remediation System (TWRS) alternatives. The analyses were conducted to accomplish the following objectives: Compare the analyzed impacts of potential criteria pollutant releases against National Ambient Air Quality Standards and applicable Washington State regulations; Compare the analyzed impacts of emissions of toxic and hazardous air pollutants against applicable Washington State regulations; and Compare the analyzed impacts of emissions of radionuclides against applicable Washington State and Federal standards. The following sections describe the proposed Hanford Site TWRS alternatives, and discuss the dispersion models used in the analyses. The remaining sections describe the methodology of the modeling approach, the data used as input to the model (meteorology, source, and receptor parameters), and the results of the modeling effort