1 / 10

Example: “Facility X”

ISSUE #1: ► AERMOD results are generally greater when based on recent met data and “new” AERSURFACE (08009) vs. “old” (met data / “old” AERSURFACE). Impact ►Many facilities will suddenly face costly changes to remain in compliance as demonstrated via AERMOD. Example: “Facility X”.

gasha
Download Presentation

Example: “Facility X”

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ISSUE #1:►AERMOD results are generally greater when based on recent met data and “new” AERSURFACE (08009) vs. “old” (met data / “old” AERSURFACE).Impact►Many facilities will suddenly face costly changes to remain in compliance as demonstrated via AERMOD.

  2. Example: “Facility X” • Previously modeled using CHS 1987-91 met data, which used “Old” AERSURFACE. • Recently modeled (same emission rates) using CHS 2002-06 met data, which used “New” AERSURFACE (08009). • Results of latter are >10 times larger for some volume & point sources; >2 times larger overall.

  3. Comparison Summary

  4. “Facility X” Sample AERMOD Results►Volume Sources

  5. “Facility X” Sample AERMOD Results►Point Sources

  6. CHS Sfc Roughness – “New” vs. “Old”

  7. Some AERSURFACE Differences

  8. #2 – How to Determine Representativeness of Met. Site vs. Facility Site ?

  9. Possible Methods (cont’d) A)Model using 2 met. stations, using the higher results. B)Model using met. data from 1 met station and 1) sfc characteristics from the met. station, and 2) sfc characteristics from the facility site; use the higher results ►Drawbacks for A) & B): - “double modeling” time/cost - EPA recommends using sfc roughness from the met site (Bowen Ratio & Albedo can be from facility site).

  10. Possibililties (cont’d) C) Compare Surface Characteristics, land use, terrain, climatology, etc. between met. and facility site. ► How is representativeness defined ? ► Is there a recommended numerical or statistical approach ??

More Related