VISTAS and CALPUFF Modeling for BART

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VISTAS and CALPUFF Modeling for BART

• Tom Rogers
• Florida Department of Environmental Protection

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Proposed BART Modeling Requirement

• Individual source exemption must show source
  impact lt 0.5 dv on all days.
• BART analysis degree of visibility improvement
  for various emission reduction strategies.
• Optional cap and trade program must show better
  visibility improvement than individual BART
  determinations

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Which Models Does the Proposed BART Rule Specify?

• an air quality model able to estimate a single
  sources contribution to visibility impairment
• CALPUFF is strongly preferred

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VISTAS Would Like

• To provide for consistent and level
  implementation of the modeling within the VISTAS
  states.
• To assist states and BART-eligible sources in
  completing this modeling, and states in reviewing
  BART modeling submissions.
• Provide for CALPUFF training to states and
  possibly others.

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What Is VISTAS Doing?

• Developing a Protocol for all VISTAS states to
  follow.
• Obtaining a Contractor to help states and
  BART-eligible sources in the BART analysis.
• Obtain different Contractors to help states
  review BART-modeling.

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VISTAS Draft Recommendations

• May use a Q/D approach to screen BART-eligible
  sources for the determination of exemption.
• Develop common CALMET dataset over the VISTAS 12
  km domain (possibly several 4 km sub-domains),
  based on 2001, 02, 03 MM5 data.

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VISTAS Draft Recommendations

• Possibly run CALPUFF for individual BART-eligible
  sources to determine if exempt.
• Limited to SO2, NOx, primary sulfate and nitrate,
  and select other PM.
• Still not sure what to do with VOC (CMAQ?)
• Possibly (but less likely) run CALPUFF for
  selected individual BART analyses.

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VISTAS Draft Recommendations

• Details in the protocol for the CALMET, CALPUFF,
  CALPOST methodology will be developed with the
  assistance of the contractor.
• The protocol will provide different procedures
  and methods for source-receptor distances of
• Less than 50 km
• 50 to 200 km
• Greater than 200 km

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What Does This Mean to States?

• States still in charge. May allow deviation from
  the protocol for a BART-eligible source if
  appropriate.
• All states and BART-eligible sources are strongly
  encouraged to use the common CALMET data.

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What Does This Mean to States?

• State may choose to have the contractor do some
  CALPUFF modeling.
• State may choose to have VISTAS contractor review
  CALPUFF modeling performed by a BART-eligible
  source.