Atmospheric Dispersion Modeling

Capabilities:

• Hearing support and expert testimony
• Toxic tort or nuisance legal proceedings
• Regulatory permit support and planning (including contested hearings)
• Risk Management Plans (under CAAA Section 112(r))
• Health effects assessments and risk analyses
• Plant siting studies
• Ambient air monitor siting
• Evaluation of normal and emergency releases, including real-time systems
• Modeling for criteria and toxic pollutant impacts
• Correlation of monitoring data and modeling predictions (i.e., calibration of model)
• Emission source characterization or source culpability ("fingerprinting") analyses
• Preparation of clear and concise reports which meet federal and state modeling report guidelines

Resources:

• All EPA-approved models, and pre- and post-processing programs
• Staff with modeling experience: 11
• Individual years of experience: 1 to 12
• 13 networked Pentium-powered PCs (runs can be queued and executed in parallel on all specified computers for maximum efficiency and turnaround)
• Electronic integration of facility and physical structure data from AutoCAD plots with computerized downwash analysis and inputs
• Analysis and processing of raw meteorological data or use of electronic meteorological data sets
• Most often used models:
  • EPA Industrial Source Complex and SCREEN
  • INPUFF
  • Toxics SCREEN (TSCREEN)

Other Qualifications:

• In-house customization and optimization of models
• Tracking of modeling developments and changes in state/EPA guidance or policy
• Regular review and comment on state/EPA modeling guidelines
• Regular attendance of EPA's Conference on Air Quality Modeling
• Completion of tens of thousands of modeling runs conducted for hundreds of sites
• Solid reputation with state/EPA staffs