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VISIBILITY ANALYSIS RECOMMENDATIONS. FEDERAL LAND MANAGERS’ AIR QUALITY RELATED VALUES WORKGROUP. “…methods for analyzing the impacts on visibility from new or modified air pollution sources.”. REGULATORY BASIS FOR RECOMMENDATION. National Goal (Clean Air Act Section 169A)

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VISIBILITY ANALYSIS RECOMMENDATIONS


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visibility analysis recommendations

VISIBILITY ANALYSIS RECOMMENDATIONS

FEDERAL LAND MANAGERS’ AIR QUALITY RELATED VALUES WORKGROUP

methods for analyzing the impacts on visibility from new or modified air pollution sources
“…methods for analyzing the impacts on visibility from new or modified air pollution sources.”
regulatory basis for recommendation
REGULATORY BASIS FOR RECOMMENDATION
  • National Goal (Clean Air Act Section 169A)
    • Sets goal as no manmade impairment
  • Definition of Visibility Impairment (40 CFR §51.301 (x))
    • Sets natural conditions as the benchmark
components of the recommendation
COMPONENTS OF THE RECOMMENDATION
  • Analysis Methodology (including a prescriptive outline)
  • Class I Area Specific Information
  • Identifies Thresholds
    • levels of concern
    • analysis thresholds
    • decision thresholds
  • Sample Application
fundamental principle
FUNDAMENTAL PRINCIPLE
  • New Sources (PSD and those subject to new source review) should not, by themselves, significantly impede progress toward the national visibility goal
methodology protocols
METHODOLOGY PROTOCOLS
  • Discrete Plumes (Near Field)
    • Sources within 50 km of the Class I Area
    • Visibility parameters
      • contrast
      • color difference (delta E)
    • Natural conditions as benchmark
    • VISCREEN, PLUVUE II
protocols continued
PROTOCOLS (CONTINUED)
  • Aggregates of Discrete Plumes (Distant/multi-source)
    • Multiple Sources or Greater than 50 km from Class I Area
    • Visibility parameter
      • Extinction
    • Natural Conditions as Benchmark
    • CALPUFF
protocols continued1
PROTOCOLS (CONTINUED)
  • Cumulative Analyses of all new source growth Required under Some Conditions
levels of concern
Near Field

Screening

|C|>=0.05

delta E >= 2

Refined

|C| >= 0.02

delta E >= 1

Distant/Multi-source

delta bext >=10%

10%  delta bext >=5%

requires further analysis

LEVELS OF CONCERN
analysis thresholds
ANALYSIS THRESHOLDS
  • de minimis threshold for further analyses
    • 0.4% change in extinction (single source)
  • threshold for need for cumulative analyses
    • 5% change in extinction (single source)
    • if a cumulative analyses has already been done
decision thresholds
Near field

Screening

|C|< 0.05

delta E < 2

Refined

|C|< 0.02

delta E < 1

Distant/Multi-source

single source (S.S) < 0.4%

cumulative delta bext >= 10% but S.S. delta bext < 0.4%

DECISION THRESHOLDS
specific class i area information
SPECIFIC CLASS I AREA INFORMATION
  • Estimates of Natural Conditions
    • NAPAP East/West Estimates for Aerosol
      • By species
      • Non-hygroscopic components
      • Hygroscopic components
    • Extinction calculation algorithm
    • Rayleigh extinction
    • Site specific or interpolated relative humidity adjustment factors